mirror of
https://github.com/wassname/CanvasTextWrapper.git
synced 2026-06-28 08:20:32 +08:00
Compare commits
33 Commits
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@@ -0,0 +1 @@
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examples
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@@ -0,0 +1,3 @@
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node_modules
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||||
examples
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||||
bower.json
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+51
-17
@@ -1,5 +1,5 @@
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/*! CanvasTextWrapper (https://github.com/namniak/CanvasTextWrapper)
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* Version: 0.1.0
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* Version: 0.2.3
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||||
*
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||||
* MIT License (http://www.opensource.org/licenses/mit-license.html)
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* Copyright (c) 2014 Vadim Namniak
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@@ -15,7 +15,9 @@
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paddingX: 0, // zero px left & right text padding relative to canvas or parent
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paddingY: 0, // zero px top & bottom text padding relative to canvas or parent
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fitParent: false, // text is tested to fit canvas width
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lineBreak: 'auto' // text fills the element's (canvas or parent) width going to a new line on a whole word
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lineBreak: 'auto', // text fills the element's (canvas or parent) width going to a new line on a whole word
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sizeToFill: false, // text is resized to fill the container (given font size is ignored)
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strokeText: false // text is stroked according to context configuration.
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};
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window.CanvasTextWrapper = function(canvas, text, opts) {
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@@ -33,7 +35,7 @@
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}
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// extract font size
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this.lineHeight = parseInt(this.font.replace(/^\D+/g, ''), 10);
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this.lineHeight = parseInt(this.font.replace(/^\D+/g, ''), 10) || 18;
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// validate all set properties
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this.validate();
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@@ -49,36 +51,62 @@
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CanvasTextWrapper.prototype = {
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drawText: function() {
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var canvas = this.canvas;
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var context = canvas.getContext('2d');
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var elementWidth = (this.fitParent === false) ? canvas.width : canvas.parentNode.clientWidth;
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var maxTextLength = elementWidth - (this.paddingX * 2);
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var words = this.text.split(/\s+/);
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var lines = [];
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var elementWidth = (this.fitParent === false) ? this.canvas.width : this.canvas.parentNode.clientWidth;
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var textPos = {
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x: 0,
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y: 0
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};
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this.checkWordsLength(context, words, maxTextLength);
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this.breakTextIntoLines(context, lines, words, maxTextLength);
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if (this.sizeToFill) {
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// starting at 1px increase font size by 1px until text block exceeds the height of its padded container or until words break
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var elementHeight = ((this.fitParent === false) ? this.canvas.height : this.canvas.parentNode.clientHeight) - (this.paddingX * 2);
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var numWords = this.text.trim().split(/\s+/).length;
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var fontSize = 0;
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do {
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this.setFontSize(++fontSize);
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var lines = this.getWrappedText(elementWidth);
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var textBlockHeight = lines.length * this.lineHeight;
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} while (textBlockHeight < elementHeight && lines.join(' ').split(/\s+/).length == numWords);
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// height of the broken down into lines text
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// use previous font size, not the one that broke the while condition
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this.setFontSize(--fontSize);
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}
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var lines = this.getWrappedText(elementWidth);
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var textBlockHeight = lines.length * this.lineHeight;
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// set vertical align for the whole text block
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this.setTextVerticalAlign(textPos, textBlockHeight);
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for (var i = 0; i < lines.length; i++) {
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this.setTextHorizontalAlign(context, textPos, elementWidth, lines[i]);
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this.setTextHorizontalAlign(this.context, textPos, elementWidth, lines[i]);
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textPos.y = parseInt(textPos.y) + parseInt(this.lineHeight);
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context.fillText(lines[i], textPos.x, textPos.y);
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this.context.fillText(lines[i], textPos.x, textPos.y);
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if (this.strokeText) {
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this.context.strokeText(lines[i], textPos.x, textPos.y);
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}
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}
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},
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setFontSize: function(size) {
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var fontParts = this.context.font.split(/\b\d+px\b/i);
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this.context.font = fontParts[0] + size + 'px' + fontParts[1];
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this.lineHeight = size;
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},
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getWrappedText: function(elementWidth) {
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var maxTextLength = elementWidth - (this.paddingX * 2);
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var words = this.text.trim().split(/\s+/);
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var lines = [];
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||||
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this.checkWordsLength(this.context, words, maxTextLength);
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this.breakTextIntoLines(this.context, lines, words, maxTextLength);
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||||
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return lines;
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||||
},
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||||
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checkWordsLength: function(context, words, maxTextLength) {
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for (var i = 0; i < words.length; i++) {
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var testString = '';
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@@ -167,6 +195,12 @@
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if (this.lineBreak !== 'auto' && this.lineBreak !== 'word') {
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throw new TypeError('From CanvasTextWrapper(): Unsupported line break value is used. Property "lineBreak" can only be set to "auto", or "word".');
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||||
}
|
||||
if (typeof this.sizeToFill !== 'boolean') {
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throw new TypeError('From CanvasTextWrapper(): Property "sizeToFill" must be set to a Boolean.');
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}
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||||
if (typeof this.strokeText !== 'boolean') {
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throw new TypeError('From CanvasTextWrapper(): Property "strokeText" must be set to a Boolean.');
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||||
}
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||||
}
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||||
};
|
||||
})();
|
||||
})();
|
||||
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||||
Vendored
+2
-2
@@ -1,7 +1,7 @@
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||||
/*! CanvasTextWrapper (https://github.com/namniak/CanvasTextWrapper)
|
||||
* Version: 0.1.0
|
||||
* Version: 0.2.3
|
||||
*
|
||||
* MIT License (http://www.opensource.org/licenses/mit-license.html)
|
||||
* Copyright (c) 2014 Vadim Namniak
|
||||
*/
|
||||
!function(){"use strict";var a={font:"18px Arial, sans-serif",textAlign:"left",verticalAlign:"top",paddingX:0,paddingY:0,fitParent:!1,lineBreak:"auto"};window.CanvasTextWrapper=function(b,c,d){if(!(this instanceof CanvasTextWrapper))throw new TypeError('CanvasTextWrapper constructor failed. Use "new" keyword when instantiating.');this.canvas=b,this.text=c;for(var e in a)this[e]=d&&d[e]?d[e]:a[e];this.lineHeight=parseInt(this.font.replace(/^\D+/g,""),10),this.validate(),this.context=this.canvas.getContext("2d"),this.context.font=this.font,this.context.textBaseline="bottom",this.drawText()},CanvasTextWrapper.prototype={drawText:function(){var a=this.canvas,b=a.getContext("2d"),c=this.fitParent===!1?a.width:a.parentNode.clientWidth,d=c-2*this.paddingX,e=this.text.split(/\s+/),f=[],g={x:0,y:0};this.checkWordsLength(b,e,d),this.breakTextIntoLines(b,f,e,d);var h=f.length*this.lineHeight;this.setTextVerticalAlign(g,h);for(var i=0;i<f.length;i++)this.setTextHorizontalAlign(b,g,c,f[i]),g.y=parseInt(g.y)+parseInt(this.lineHeight),b.fillText(f[i],g.x,g.y)},checkWordsLength:function(a,b,c){for(var d=0;d<b.length;d++){var e="",f=a.measureText(b[d]).width;if(f>c){for(var g=0;a.measureText(e+b[d][g]).width<=c&&g<b[d].length;g++)e+=b[d][g];var h=b[d].slice(0,g),i=b[d].slice(g);b.splice(d,1,h,i)}}},breakTextIntoLines:function(a,b,c,d){for(var e=0,f=0;e<c.length;f++)if(b[f]="","auto"===this.lineBreak){for(;a.measureText(b[f]+c[e]).width<=d&&e<c.length;)b[f]+=c[e]+" ",e++;b[f]=b[f].trim()}else"word"===this.lineBreak&&(b[f]=c[e],e++)},setTextHorizontalAlign:function(a,b,c,d){b.x="center"===this.textAlign?(c-a.measureText(d).width)/2:"right"===this.textAlign?c-a.measureText(d).width-this.paddingX:this.paddingX},setTextVerticalAlign:function(a,b){var c=this.fitParent===!1?this.canvas.height:this.canvas.parentNode.clientHeight;a.y="middle"===this.verticalAlign?(c-b)/2:"bottom"===this.verticalAlign?c-b-this.paddingY:this.paddingY},validate:function(){if(!(this.canvas instanceof HTMLCanvasElement))throw new TypeError("From CanvasTextWrapper(): Element passed as the first parameter is not an instance of HTMLCanvasElement.");if("string"!=typeof this.text)throw new TypeError("From CanvasTextWrapper(): The second, dedicated for the text, parameter must be a string.");if(isNaN(this.lineHeight))throw new TypeError('From CanvasTextWrapper(): Cannot parse font size as an Integer. Check "font" property\'s value.');if("left"!==this.textAlign&&"center"!==this.textAlign&&"right"!==this.textAlign)throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal align value is used. Property "textAlign" can only be set to "left", "center", or "right".');if("top"!==this.verticalAlign&&"middle"!==this.verticalAlign&&"bottom"!==this.verticalAlign)throw new TypeError('From CanvasTextWrapper(): Unsupported vertical align value is used. Property "verticalAlign" can only be set to "top", "middle", or "bottom".');if(isNaN(this.paddingX))throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal padding value is used. Property "paddingX" must be set to a number');if(isNaN(this.paddingY))throw new TypeError('From CanvasTextWrapper(): Unsupported vertical padding value is used. Property "paddingY" must be set to a number.');if("boolean"!=typeof this.fitParent)throw new TypeError('From CanvasTextWrapper(): Property "fitParent" must be set to a Boolean.');if("auto"!==this.lineBreak&&"word"!==this.lineBreak)throw new TypeError('From CanvasTextWrapper(): Unsupported line break value is used. Property "lineBreak" can only be set to "auto", or "word".')}}}();
|
||||
!function(){"use strict";var a={font:"18px Arial, sans-serif",textAlign:"left",verticalAlign:"top",paddingX:0,paddingY:0,fitParent:!1,lineBreak:"auto",sizeToFill:!1,strokeText:!1};window.CanvasTextWrapper=function(b,c,d){if(!(this instanceof CanvasTextWrapper))throw new TypeError('CanvasTextWrapper constructor failed. Use "new" keyword when instantiating.');this.canvas=b,this.text=c;for(var e in a)this[e]=d&&d[e]?d[e]:a[e];this.lineHeight=parseInt(this.font.replace(/^\D+/g,""),10)||18,this.validate(),this.context=this.canvas.getContext("2d"),this.context.font=this.font,this.context.textBaseline="bottom",this.drawText()},CanvasTextWrapper.prototype={drawText:function(){var a=this.fitParent===!1?this.canvas.width:this.canvas.parentNode.clientWidth,b={x:0,y:0};if(this.sizeToFill){var c=(this.fitParent===!1?this.canvas.height:this.canvas.parentNode.clientHeight)-2*this.paddingX,d=this.text.trim().split(/\s+/).length,e=0;do{this.setFontSize(++e);var f=this.getWrappedText(a),g=f.length*this.lineHeight}while(c>g&&f.join(" ").split(/\s+/).length==d);this.setFontSize(--e)}var f=this.getWrappedText(a),g=f.length*this.lineHeight;this.setTextVerticalAlign(b,g);for(var h=0;h<f.length;h++)this.setTextHorizontalAlign(this.context,b,a,f[h]),b.y=parseInt(b.y)+parseInt(this.lineHeight),this.context.fillText(f[h],b.x,b.y),this.strokeText&&this.context.strokeText(f[h],b.x,b.y)},setFontSize:function(a){var b=this.context.font.split(/\b\d+px\b/i);this.context.font=b[0]+a+"px"+b[1],this.lineHeight=a},getWrappedText:function(a){var b=a-2*this.paddingX,c=this.text.trim().split(/\s+/),d=[];return this.checkWordsLength(this.context,c,b),this.breakTextIntoLines(this.context,d,c,b),d},checkWordsLength:function(a,b,c){for(var d=0;d<b.length;d++){var e="",f=a.measureText(b[d]).width;if(f>c){for(var g=0;a.measureText(e+b[d][g]).width<=c&&g<b[d].length;g++)e+=b[d][g];var h=b[d].slice(0,g),i=b[d].slice(g);b.splice(d,1,h,i)}}},breakTextIntoLines:function(a,b,c,d){for(var e=0,f=0;e<c.length;f++)if(b[f]="","auto"===this.lineBreak){for(;a.measureText(b[f]+c[e]).width<=d&&e<c.length;)b[f]+=c[e]+" ",e++;b[f]=b[f].trim()}else"word"===this.lineBreak&&(b[f]=c[e],e++)},setTextHorizontalAlign:function(a,b,c,d){b.x="center"===this.textAlign?(c-a.measureText(d).width)/2:"right"===this.textAlign?c-a.measureText(d).width-this.paddingX:this.paddingX},setTextVerticalAlign:function(a,b){var c=this.fitParent===!1?this.canvas.height:this.canvas.parentNode.clientHeight;a.y="middle"===this.verticalAlign?(c-b)/2:"bottom"===this.verticalAlign?c-b-this.paddingY:this.paddingY},validate:function(){if(!(this.canvas instanceof HTMLCanvasElement))throw new TypeError("From CanvasTextWrapper(): Element passed as the first parameter is not an instance of HTMLCanvasElement.");if("string"!=typeof this.text)throw new TypeError("From CanvasTextWrapper(): The second, dedicated for the text, parameter must be a string.");if(isNaN(this.lineHeight))throw new TypeError('From CanvasTextWrapper(): Cannot parse font size as an Integer. Check "font" property\'s value.');if("left"!==this.textAlign&&"center"!==this.textAlign&&"right"!==this.textAlign)throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal align value is used. Property "textAlign" can only be set to "left", "center", or "right".');if("top"!==this.verticalAlign&&"middle"!==this.verticalAlign&&"bottom"!==this.verticalAlign)throw new TypeError('From CanvasTextWrapper(): Unsupported vertical align value is used. Property "verticalAlign" can only be set to "top", "middle", or "bottom".');if(isNaN(this.paddingX))throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal padding value is used. Property "paddingX" must be set to a number');if(isNaN(this.paddingY))throw new TypeError('From CanvasTextWrapper(): Unsupported vertical padding value is used. Property "paddingY" must be set to a number.');if("boolean"!=typeof this.fitParent)throw new TypeError('From CanvasTextWrapper(): Property "fitParent" must be set to a Boolean.');if("auto"!==this.lineBreak&&"word"!==this.lineBreak)throw new TypeError('From CanvasTextWrapper(): Unsupported line break value is used. Property "lineBreak" can only be set to "auto", or "word".');if("boolean"!=typeof this.sizeToFill)throw new TypeError('From CanvasTextWrapper(): Property "sizeToFill" must be set to a Boolean.');if("boolean"!=typeof this.strokeText)throw new TypeError('From CanvasTextWrapper(): Property "strokeText" must be set to a Boolean.')}}}();
|
||||
@@ -1,2 +1,69 @@
|
||||
CanvasTextWrapper
|
||||
=================
|
||||
|
||||
##Syntax
|
||||
```
|
||||
new CanvasTextWrapper(HTMLCanvasElement, String [, options]);
|
||||
```
|
||||
|
||||
```options``` - is a JavaScript object with the following available properties and values:
|
||||
|
||||
- ```font: String``` - text style that includes font size (in px), weight and family, similarly to CSS font shorthand property
|
||||
- ```textAlign: "left" | "center" | "right"``` - horizontal alignment for each line
|
||||
- ```verticalAlign: "top" | "middle" | "bottom"``` - vertical alignment for the whole text block
|
||||
- ```paddingX: Number``` - horizontal padding in pixels set equally on both, left and right sides of the element
|
||||
- ```paddingY: Number``` - vertical padding in pixels set equally on both, top and bottom sides of the element
|
||||
- ```fitParent: Boolean``` - parameter that controls which element to fit where ```true``` means fit canvas parent's width instead of canvas own width
|
||||
- ```lineBreak: "auto" | "word"``` - text split rule. When using ```"auto"```, text fills the element's width, going to a new line on a whole word when there's no more room. If ```"word"``` is set as value, each next word will be placed on a new line.
|
||||
- ```sizeToFill: Boolean``` - ignore given font size and resize text to fill its padded container
|
||||
- ```strokeText: Boolean``` - add text outline based on context configuration (make sure it doesn't contradict with other context settings such as globalCompositeOperation, etc)
|
||||
|
||||
NOTE: if a single word is too long to fit the width with specified font size, it will be broken into as many lines as required on any letter of the word unless ```sizeToFill``` option is used.
|
||||
|
||||
##Defaults
|
||||
|
||||
The default options object which values will be used if a property is not specified or no object is passed:
|
||||
|
||||
```
|
||||
{
|
||||
font: "18px Arial, sans-serif",
|
||||
textAlign: "left",
|
||||
verticalAlign: "top",
|
||||
paddingX: 0,
|
||||
paddingY: 0,
|
||||
fitParent: false,
|
||||
lineBreak: "auto",
|
||||
sizeToFill: false,
|
||||
strokeText: false
|
||||
}
|
||||
```
|
||||
|
||||
##Usage
|
||||
Use standard canvas text drawing сщташпгкфешщты such as "fillStyle" and "globalCompositeOperation" when needed before using CanvasTextWrapper like so:
|
||||
```
|
||||
var canvas = document.createElement('canvas');
|
||||
canvas.width = 300;
|
||||
canvas.height = 250;
|
||||
context = canvas.getContext("2d");
|
||||
context.fillStyle = "rgb(255, 255, 255)";
|
||||
context.fillRect(0, 0, canvas.width, canvas.height);
|
||||
|
||||
new CanvasTextWrapper(canvas, "Hi there", {
|
||||
font: "normal 40px Open Sans, sans-serif",
|
||||
textAlign: "center",
|
||||
verticalAlign: "bottom",
|
||||
paddingY: 10,
|
||||
lineBreak: "word",
|
||||
});
|
||||
```
|
||||
|
||||
##Examples
|
||||
http://namniak.github.io/CanvasTextWrapper/
|
||||
|
||||
##Installation
|
||||
|
||||
```
|
||||
bower install canvas-text-wrapper
|
||||
|
||||
npm install canvas-text-wrapper
|
||||
```
|
||||
|
||||
+6
-2
@@ -1,6 +1,6 @@
|
||||
{
|
||||
"name": "canvas-text-wrapper",
|
||||
"version": "0.1.0",
|
||||
"version": "0.2.3",
|
||||
"ignore": [
|
||||
"**/.*",
|
||||
"**/*.log",
|
||||
@@ -10,5 +10,9 @@
|
||||
"node_modules",
|
||||
"README.md"
|
||||
],
|
||||
"homepage": "https://github.com/namniak/CanvasTextWrapper.git"
|
||||
"repository": {
|
||||
"type": "git",
|
||||
"url": "git://github.com/namniak/CanvasTextWrapper.git"
|
||||
},
|
||||
"homepage": "http://namniak.github.io/CanvasTextWrapper/"
|
||||
}
|
||||
|
||||
@@ -1,48 +0,0 @@
|
||||
/* http://meyerweb.com/eric/tools/css/reset/
|
||||
v2.0 | 20110126
|
||||
License: none (public domain)
|
||||
*/
|
||||
|
||||
html, body, div, span, applet, object, iframe,
|
||||
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
|
||||
a, abbr, acronym, address, big, cite, code,
|
||||
del, dfn, em, img, ins, kbd, q, s, samp,
|
||||
small, strike, strong, sub, sup, tt, var,
|
||||
b, u, i, center,
|
||||
dl, dt, dd, ol, ul, li,
|
||||
fieldset, form, label, legend,
|
||||
table, caption, tbody, tfoot, thead, tr, th, td,
|
||||
article, aside, canvas, details, embed,
|
||||
figure, figcaption, footer, header, hgroup,
|
||||
menu, nav, output, ruby, section, summary,
|
||||
time, mark, audio, video {
|
||||
margin: 0;
|
||||
padding: 0;
|
||||
border: 0;
|
||||
font-size: 100%;
|
||||
font: inherit;
|
||||
vertical-align: baseline;
|
||||
}
|
||||
/* HTML5 display-role reset for older browsers */
|
||||
article, aside, details, figcaption, figure,
|
||||
footer, header, hgroup, menu, nav, section {
|
||||
display: block;
|
||||
}
|
||||
body {
|
||||
line-height: 1;
|
||||
}
|
||||
ol, ul {
|
||||
list-style: none;
|
||||
}
|
||||
blockquote, q {
|
||||
quotes: none;
|
||||
}
|
||||
blockquote:before, blockquote:after,
|
||||
q:before, q:after {
|
||||
content: '';
|
||||
content: none;
|
||||
}
|
||||
table {
|
||||
border-collapse: collapse;
|
||||
border-spacing: 0;
|
||||
}
|
||||
@@ -1,136 +0,0 @@
|
||||
body {
|
||||
width: 960px;
|
||||
margin: auto;
|
||||
font-family: 'Open Sans', sans-serif;
|
||||
color: #fff;
|
||||
}
|
||||
|
||||
div, header, footer, article {
|
||||
box-sizing: border-box;
|
||||
}
|
||||
|
||||
header, footer, article {
|
||||
width: 930px;
|
||||
margin: auto;
|
||||
background-color: #0D9F69;
|
||||
padding: 20px;
|
||||
}
|
||||
|
||||
header {
|
||||
font-size: 60px;
|
||||
font-weight: 700;
|
||||
}
|
||||
|
||||
.description {
|
||||
width: 800px;
|
||||
margin-top: 20px;
|
||||
font-size: 22px;
|
||||
font-weight: normal;
|
||||
}
|
||||
|
||||
footer {
|
||||
margin-top: 40px;
|
||||
}
|
||||
|
||||
a {
|
||||
font-size: 20px;
|
||||
font-weight: normal;
|
||||
color: #fff;
|
||||
text-decoration: none;
|
||||
}
|
||||
|
||||
a:hover {
|
||||
text-decoration: underline;
|
||||
}
|
||||
|
||||
article {
|
||||
border-top: 1px solid #fff;
|
||||
}
|
||||
|
||||
.white-block {
|
||||
display: table-cell;
|
||||
height: 30px;
|
||||
padding: 20px;
|
||||
vertical-align: middle;
|
||||
background-color: #fff;
|
||||
font-weight: 100;
|
||||
color: #0D9F69;
|
||||
line-height: 120%;
|
||||
}
|
||||
|
||||
p {
|
||||
margin: 10px 0;
|
||||
line-height: 120%;
|
||||
}
|
||||
|
||||
h2 {
|
||||
font-size: 30px;
|
||||
}
|
||||
|
||||
h6 {
|
||||
font-weight: 700;
|
||||
text-decoration: underline;
|
||||
display: inline;
|
||||
}
|
||||
|
||||
.syntax {
|
||||
padding: 10px 10px 0 20px;
|
||||
}
|
||||
|
||||
.syntax > li {
|
||||
list-style: none;
|
||||
margin-bottom: 15px;
|
||||
}
|
||||
|
||||
.values li {
|
||||
text-indent: 20px;
|
||||
list-style: inside circle;
|
||||
line-height: 120%;
|
||||
}
|
||||
|
||||
section {
|
||||
margin-top: 40px;
|
||||
}
|
||||
|
||||
section > div {
|
||||
display: inline-block;
|
||||
position: relative;
|
||||
width: 450px;
|
||||
margin: 15px;
|
||||
border: 1px solid #0D9F69;
|
||||
overflow: hidden;
|
||||
}
|
||||
|
||||
section h2 {
|
||||
color: #0D9F69;
|
||||
text-indent: 30px;
|
||||
margin-bottom: 20px;
|
||||
}
|
||||
|
||||
section > div div {
|
||||
width: 100%;
|
||||
height: 200px;
|
||||
background-color: #0D9F69;
|
||||
margin-top: 250px;
|
||||
padding: 20px;
|
||||
}
|
||||
|
||||
canvas, img {
|
||||
position: absolute;
|
||||
top: 0;
|
||||
left: 0;
|
||||
}
|
||||
|
||||
img {
|
||||
width: 100%;
|
||||
z-index: -1;
|
||||
}
|
||||
|
||||
span {
|
||||
margin-left: 20px;
|
||||
}
|
||||
|
||||
span, .emph {
|
||||
font-weight: 600;
|
||||
display: inline;
|
||||
}
|
||||
Binary file not shown.
|
Before Width: | Height: | Size: 48 KiB |
@@ -1,125 +0,0 @@
|
||||
<!DOCTYPE HTML>
|
||||
<html>
|
||||
<head>
|
||||
<meta charset="utf-8">
|
||||
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,700,600' rel='stylesheet' type='text/css'>
|
||||
<link rel="stylesheet" href="css/reset.css">
|
||||
<link rel="stylesheet" href="css/styles.css">
|
||||
<script src="js/CanvasTextWrapper.js"></script>
|
||||
<script src="js/options.js"></script>
|
||||
<script src="js/examples.js"></script>
|
||||
<title>CanvasTextWrapper.js</title>
|
||||
</head>
|
||||
<body>
|
||||
<header>
|
||||
<p>CanvasTextWrapper.js</p>
|
||||
|
||||
<p class="description">
|
||||
JavaScript canvas text wrapper that automatically splits a string into lines on specified rule with
|
||||
optional alignments and padding.
|
||||
</p>
|
||||
</header>
|
||||
<article>
|
||||
<h2>Syntax:</h2><br/>
|
||||
|
||||
<p class="white-block">new CanvasTextWrapper(HTMLCanvasElement, String [, Options]);</p><br/>
|
||||
|
||||
<div>
|
||||
<div class="emph">OPTIONS</div>
|
||||
- is a JavaScript object with the following available properties and values:
|
||||
</div>
|
||||
<ul class="syntax">
|
||||
<li>
|
||||
<div class="emph">font</div>
|
||||
(String) - text style that includes font size, family, etc. specified similarly to CSS
|
||||
font shorthand property
|
||||
</li>
|
||||
<li>
|
||||
<div class="emph">textAlign</div>
|
||||
(String) - horizontal alignment that applies for each line
|
||||
<ul class="values">
|
||||
<li>"left"</li>
|
||||
<li>"center"</li>
|
||||
<li>"right"</li>
|
||||
</ul>
|
||||
</li>
|
||||
<li>
|
||||
<div class="emph">verticalAlign</div>
|
||||
(String) - vertical alignment that applies on a whole block of text
|
||||
<ul class="values">
|
||||
<li>"top"</li>
|
||||
<li>"middle"</li>
|
||||
<li>"bottom"</li>
|
||||
</ul>
|
||||
</li>
|
||||
<li>
|
||||
<div class="emph">paddingX</div>
|
||||
(Number) - horizontal padding in pixels set equally on both, left and right sides of
|
||||
the element
|
||||
</li>
|
||||
<li>
|
||||
<div class="emph">paddingY</div>
|
||||
(Number) - vertical padding in pixels set equally on both, top and bottom sides of the element
|
||||
</li>
|
||||
<li>
|
||||
<div class="emph">fitParent</div>
|
||||
(Boolean) - parameter that controls which element to fit
|
||||
<ul class="values">
|
||||
<li>true - fit canvas parent's width instead of canvas own width</li>
|
||||
<li>false - fit canvas width</li>
|
||||
</ul>
|
||||
</li>
|
||||
<li>
|
||||
<div class="emph">lineBreak</div>
|
||||
(String) - text split rule
|
||||
<ul class="values">
|
||||
<li>"auto" - text fills the element's width going to a new line on a whole word when no more space</li>
|
||||
<li>"word" - each next word will be placed on a new line</li>
|
||||
</ul>
|
||||
<p>
|
||||
NOTE: if a single word is too long to fit the width with specified font size, it will be broken into as
|
||||
many lines as required on any letter without specific word breaking rule.
|
||||
</p>
|
||||
</li>
|
||||
</ul>
|
||||
</article>
|
||||
<article>
|
||||
<h2>Defaults & Usage:</h2><br/>
|
||||
|
||||
<p>The default options object which values will be used if a property is not specified or no object is passed:</p>
|
||||
|
||||
<p class="white-block">
|
||||
{ font: "18px Arial, sans-serif",<br/>
|
||||
textAlign: "left",<br/>
|
||||
verticalAlign: "top",<br/>
|
||||
paddingX: 0,<br/>
|
||||
paddingY: 0,<br/>
|
||||
fitParent: false,<br/>
|
||||
lineBreak: "auto" }
|
||||
</p>
|
||||
<br/>
|
||||
|
||||
<p>
|
||||
Use standard canvas text drawing methods such as "fillStyle" and "globalCompositeOperation" when needed before
|
||||
using CanvasTextWrapper like so:
|
||||
</p>
|
||||
|
||||
<p class="white-block">
|
||||
var canvas = document.createElement('canvas');<br/>
|
||||
canvas.width = 300;<br/>
|
||||
canvas.height = 250;<br/>
|
||||
context = canvas.getContext("2d");<br/>
|
||||
context.fillStyle = "rgb(255, 255, 255)";<br/>
|
||||
context.fillRect(0, 0, canvas.width, canvas.height);<br/><br/>
|
||||
context.globalCompositeOperation = "destination-out";<br/>
|
||||
var wrapper = new CanvasTextWrapper(canvas, 'Hello'); // default options will apply<br/>
|
||||
</p>
|
||||
</article>
|
||||
<section>
|
||||
<h2>Examples:</h2>
|
||||
</section>
|
||||
<footer>
|
||||
← <a href="https://github.com/namniak/CanvasTextWrapper">View on GitHub</a>
|
||||
</footer>
|
||||
</body>
|
||||
</html>
|
||||
@@ -1,171 +0,0 @@
|
||||
/*! CanvasTextWrapper (https://github.com/namniak/CanvasTextWrapper)
|
||||
* Version: 0.1.0
|
||||
*
|
||||
* MIT License (http://www.opensource.org/licenses/mit-license.html)
|
||||
* Copyright (c) 2014 Vadim Namniak
|
||||
*/
|
||||
|
||||
(function() {
|
||||
'use strict';
|
||||
|
||||
var defaultOptions = {
|
||||
font: '18px Arial, sans-serif',
|
||||
textAlign: 'left', // each line of text is aligned left
|
||||
verticalAlign: 'top', // text lines block is aligned top
|
||||
paddingX: 0, // zero px left & right text padding relative to canvas or parent
|
||||
paddingY: 0, // zero px top & bottom text padding relative to canvas or parent
|
||||
fitParent: false, // text is tested to fit canvas width
|
||||
lineBreak: 'auto' // text fills the element's (canvas or parent) width going to a new line on a whole word
|
||||
};
|
||||
|
||||
window.CanvasTextWrapper = function(canvas, text, opts) {
|
||||
if (!(this instanceof CanvasTextWrapper)) {
|
||||
throw new TypeError('CanvasTextWrapper constructor failed. Use "new" keyword when instantiating.');
|
||||
}
|
||||
|
||||
this.canvas = canvas;
|
||||
this.text = text;
|
||||
|
||||
// set options to specified or default values
|
||||
for (var property in defaultOptions) {
|
||||
this[property] = (opts && opts[property]) ? opts[property] : defaultOptions[property];
|
||||
}
|
||||
|
||||
// extract font size
|
||||
this.lineHeight = parseInt(this.font.replace(/^\D+/g, ''), 10);
|
||||
|
||||
// validate all set properties
|
||||
this.validate();
|
||||
|
||||
// basic context settings
|
||||
this.context = this.canvas.getContext('2d');
|
||||
this.context.font = this.font;
|
||||
this.context.textBaseline = 'bottom';
|
||||
|
||||
this.drawText();
|
||||
};
|
||||
|
||||
CanvasTextWrapper.prototype = {
|
||||
|
||||
drawText: function() {
|
||||
var canvas = this.canvas;
|
||||
var context = canvas.getContext('2d');
|
||||
|
||||
var elementWidth = (this.fitParent === false) ? canvas.width : canvas.parentNode.clientWidth;
|
||||
var maxTextLength = elementWidth - (this.paddingX * 2);
|
||||
|
||||
var words = this.text.split(/\s+/);
|
||||
var lines = [];
|
||||
var textPos = {
|
||||
x: 0,
|
||||
y: 0
|
||||
};
|
||||
|
||||
this.checkWordsLength(context, words, maxTextLength);
|
||||
this.breakTextIntoLines(context, lines, words, maxTextLength);
|
||||
|
||||
// height of the broken down into lines text
|
||||
var textBlockHeight = lines.length * this.lineHeight;
|
||||
|
||||
// set vertical align for the whole text block
|
||||
this.setTextVerticalAlign(textPos, textBlockHeight);
|
||||
|
||||
for (var i = 0; i < lines.length; i++) {
|
||||
this.setTextHorizontalAlign(context, textPos, elementWidth, lines[i]);
|
||||
|
||||
textPos.y = parseInt(textPos.y) + parseInt(this.lineHeight);
|
||||
context.fillText(lines[i], textPos.x, textPos.y);
|
||||
}
|
||||
},
|
||||
|
||||
checkWordsLength: function(context, words, maxTextLength) {
|
||||
for (var i = 0; i < words.length; i++) {
|
||||
var testString = '';
|
||||
var tokenLen = context.measureText(words[i]).width;
|
||||
|
||||
// check if a word exceeds the element's width
|
||||
if (tokenLen > maxTextLength) {
|
||||
for (var k = 0; (context.measureText(testString + words[i][k]).width <= maxTextLength) && (k < words[i].length); k++) {
|
||||
testString += words[i][k];
|
||||
}
|
||||
|
||||
// break the word because it's too long
|
||||
var sliced = words[i].slice(0, k);
|
||||
var leftover = words[i].slice(k);
|
||||
words.splice(i, 1, sliced, leftover);
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
breakTextIntoLines: function(context, lines, words, maxTextLength) {
|
||||
for (var i = 0, j = 0; i < words.length; j++) {
|
||||
lines[j] = '';
|
||||
|
||||
if (this.lineBreak === 'auto') {
|
||||
// put as many full words in a line as can fit element
|
||||
while ((context.measureText(lines[j] + words[i]).width <= maxTextLength) && (i < words.length)) {
|
||||
lines[j] += words[i] + ' ';
|
||||
i++;
|
||||
}
|
||||
lines[j] = lines[j].trim();
|
||||
} else if (this.lineBreak === 'word') {
|
||||
// put each next word in a new line
|
||||
lines[j] = words[i];
|
||||
i++;
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
setTextHorizontalAlign: function(context, textPos, elementWidth, line) {
|
||||
if (this.textAlign === 'center') {
|
||||
textPos.x = (elementWidth - context.measureText(line).width) / 2;
|
||||
} else if (this.textAlign === 'right') {
|
||||
textPos.x = elementWidth - context.measureText(line).width - this.paddingX;
|
||||
} else {
|
||||
textPos.x = this.paddingX;
|
||||
}
|
||||
},
|
||||
|
||||
setTextVerticalAlign: function(textPos, textBlockHeight) {
|
||||
var elementHeight = (this.fitParent === false) ? this.canvas.height : this.canvas.parentNode.clientHeight;
|
||||
|
||||
if (this.verticalAlign === 'middle') {
|
||||
textPos.y = (elementHeight - textBlockHeight) / 2;
|
||||
} else if (this.verticalAlign === 'bottom') {
|
||||
textPos.y = elementHeight - textBlockHeight - this.paddingY;
|
||||
} else {
|
||||
textPos.y = this.paddingY;
|
||||
}
|
||||
},
|
||||
|
||||
validate: function() {
|
||||
if (!(this.canvas instanceof HTMLCanvasElement)) {
|
||||
throw new TypeError('From CanvasTextWrapper(): Element passed as the first parameter is not an instance of HTMLCanvasElement.');
|
||||
}
|
||||
if (typeof this.text !== 'string') {
|
||||
throw new TypeError('From CanvasTextWrapper(): The second, dedicated for the text, parameter must be a string.');
|
||||
}
|
||||
if (isNaN(this.lineHeight)) {
|
||||
throw new TypeError('From CanvasTextWrapper(): Cannot parse font size as an Integer. Check "font" property\'s value.');
|
||||
}
|
||||
if (this.textAlign !== 'left' && this.textAlign !== 'center' && this.textAlign !== 'right') {
|
||||
throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal align value is used. Property "textAlign" can only be set to "left", "center", or "right".');
|
||||
}
|
||||
if (this.verticalAlign !== 'top' && this.verticalAlign !== 'middle' && this.verticalAlign !== 'bottom') {
|
||||
throw new TypeError('From CanvasTextWrapper(): Unsupported vertical align value is used. Property "verticalAlign" can only be set to "top", "middle", or "bottom".');
|
||||
}
|
||||
if (isNaN(this.paddingX)) {
|
||||
throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal padding value is used. Property "paddingX" must be set to a number');
|
||||
}
|
||||
if (isNaN(this.paddingY)) {
|
||||
throw new TypeError('From CanvasTextWrapper(): Unsupported vertical padding value is used. Property "paddingY" must be set to a number.');
|
||||
}
|
||||
if (typeof this.fitParent !== 'boolean') {
|
||||
throw new TypeError('From CanvasTextWrapper(): Property "fitParent" must be set to a Boolean.');
|
||||
}
|
||||
if (this.lineBreak !== 'auto' && this.lineBreak !== 'word') {
|
||||
throw new TypeError('From CanvasTextWrapper(): Unsupported line break value is used. Property "lineBreak" can only be set to "auto", or "word".');
|
||||
}
|
||||
}
|
||||
};
|
||||
})();
|
||||
@@ -1,76 +0,0 @@
|
||||
document.onreadystatechange = function() {
|
||||
if (document.readyState === 'complete') {
|
||||
|
||||
(function() {
|
||||
var container = document.getElementsByTagName('section')[0];
|
||||
var w = 448;
|
||||
var h = 250;
|
||||
var aspectRatio = 0;
|
||||
var text = 'Canvas text wrapping example';
|
||||
|
||||
var img = new Image();
|
||||
img.src = 'img/bg.jpg';
|
||||
img.onload = function() {
|
||||
aspectRatio = img.naturalWidth / img.naturalHeight;
|
||||
createExamples();
|
||||
};
|
||||
|
||||
// use options.js file
|
||||
var options = optionsArr;
|
||||
|
||||
function createExamples() {
|
||||
var fragment = new DocumentFragment();
|
||||
var context;
|
||||
|
||||
for (var i = 0; i < options.length; i++) {
|
||||
var exampleItem = document.createElement('div');
|
||||
fragment.appendChild(exampleItem);
|
||||
|
||||
// draw canvas image
|
||||
var canvasImg = document.createElement('canvas');
|
||||
canvasImg.width = w;
|
||||
canvasImg.height = h;
|
||||
context = canvasImg.getContext('2d');
|
||||
context.drawImage(img, 0, 0, w, w * aspectRatio);
|
||||
exampleItem.appendChild(canvasImg);
|
||||
|
||||
// create canvas mask layer
|
||||
var canvasMask = document.createElement('canvas');
|
||||
canvasMask.width = w;
|
||||
canvasMask.height = h;
|
||||
context = canvasMask.getContext('2d');
|
||||
context.fillStyle = 'rgba(255,255,255, 1)';
|
||||
context.fillRect(0, 0, w, h);
|
||||
exampleItem.appendChild(canvasMask);
|
||||
|
||||
// create text to be cut out mask layer
|
||||
context.fillStyle = '#212121';
|
||||
context.globalCompositeOperation = 'destination-out';
|
||||
|
||||
// create wrapper
|
||||
new CanvasTextWrapper(canvasMask, ('#' + (i + 1) + ' ' + text), options[i]);
|
||||
|
||||
// create hint code block
|
||||
var hint = document.createElement('div');
|
||||
exampleItem.appendChild(hint);
|
||||
var optionsData = '';
|
||||
|
||||
// read used properties
|
||||
for (var property in options[i]) {
|
||||
var stringWrapper = (property == 'paddingX' || property == 'paddingY') ? '' : '"';
|
||||
optionsData += ' <span>' + property + '</span>: ' +
|
||||
stringWrapper + options[i][property] + stringWrapper + ',<br/>';
|
||||
}
|
||||
|
||||
// print example code
|
||||
hint.innerHTML = '<h6>CODE:</h6><p>' +
|
||||
'new CanvasTextWrapper(canvasEl, textStr, {<br/>' + optionsData + '});' +
|
||||
'</p>';
|
||||
}
|
||||
|
||||
// inject document fragment into actual DOM
|
||||
container.appendChild(fragment);
|
||||
}
|
||||
})();
|
||||
}
|
||||
};
|
||||
@@ -1,54 +0,0 @@
|
||||
(function() {
|
||||
window.optionsArr = [
|
||||
{
|
||||
font: 'bold 55px Open Sans, sans-serif',
|
||||
paddingX: 0,
|
||||
paddingY: 0,
|
||||
fitParent: false,
|
||||
lineBreak: 'auto'
|
||||
},
|
||||
{
|
||||
font: 'normal 40px Open Sans, sans-serif',
|
||||
textAlign: 'center',
|
||||
verticalAlign: 'top',
|
||||
paddingY: 10,
|
||||
lineBreak: 'word'
|
||||
},
|
||||
{
|
||||
font: 'bold 55px Open Sans, sans-serif',
|
||||
textAlign: 'right',
|
||||
verticalAlign: 'bottom',
|
||||
paddingX: 30
|
||||
},
|
||||
{
|
||||
font: 'bold 35px Open Sans, sans-serif',
|
||||
textAlign: 'center',
|
||||
verticalAlign: 'middle'
|
||||
},
|
||||
{
|
||||
font: 'bold 55px Open Sans, sans-serif',
|
||||
textAlign: 'right',
|
||||
verticalAlign: 'top',
|
||||
paddingX: 15,
|
||||
paddingY: 5
|
||||
},
|
||||
{
|
||||
font: 'bold 45px Open Sans, sans-serif',
|
||||
textAlign: 'center',
|
||||
verticalAlign: 'middle',
|
||||
lineBreak: 'word'
|
||||
},
|
||||
{
|
||||
font: 'bold 25px Open Sans, sans-serif',
|
||||
verticalAlign: 'bottom',
|
||||
paddingX: 10,
|
||||
paddingY: 60
|
||||
},
|
||||
{
|
||||
font: '50px Open Sans, sans-serif',
|
||||
textAlign: 'right',
|
||||
verticalAlign: 'middle',
|
||||
paddingX: 15
|
||||
}
|
||||
];
|
||||
})();
|
||||
+3
-2
@@ -1,9 +1,10 @@
|
||||
{
|
||||
"name": "canvas-text-wrapper",
|
||||
"description": "Javascript canvas text wrapper that automatically breaks the text into lines on a rule of your choice with available horizontal and vertical align options.",
|
||||
"version": "0.1.0",
|
||||
"description": "JavaScript canvas text wrapper that automatically splits a string into lines on specified rule with optional alignments and padding.",
|
||||
"version": "0.2.3",
|
||||
"license": "MIT",
|
||||
"main": "CanvasTextWrapper.min.js",
|
||||
"homepage": "http://namniak.github.io/CanvasTextWrapper/",
|
||||
"repository": {
|
||||
"type": "git",
|
||||
"url": "https://github.com/namniak/CanvasTextWrapper"
|
||||
|
||||
Reference in New Issue
Block a user