phaser/examples/geometry/line.js

var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { create: create });

function create() {

    var graphics = game.add.graphics(50,50);

    // set a fill and line style
    graphics.beginFill(0xFF0000);
    graphics.lineStyle(10, 0xFF0000, 1);
    
    // draw a shape
    graphics.moveTo(50,50);
    graphics.lineTo(250, 50);
    graphics.endFill();

}