initial view version

annotationscene.py

@@ -0,0 +1,63 @@
+from PyQt4.QtGui import *
+from PyQt4.QtCore import *
+from pointitem import *
+import math
+
+modes = range(5)
+SELECT, POINT, LINE, RECTANGLE, POLYGON = modes
+
+class AnnotationScene(QGraphicsScene):
+    def __init__(self, parent=None):
+        super(AnnotationScene, self).__init__(parent)
+        self.setBackgroundBrush(Qt.darkGray)
+
+        self.reset()
+        self.setSceneRect(0,0, 640, 480)
+
+        self.mode_ = None
+        self.mousePressed_ = None
+        self.activeItem_ = None
+
+    def reset(self):
+        self.clear()
+
+    def setMode(self, mode):
+        assert (mode in modes)
+        self.mode_ = mode
+        print mode
+    
+        
+    def mousePressEvent(self, event):
+        if not self.sceneRect().contains(event.scenePos()):
+            return
+        elif self.mode_ == SELECT:
+            QGraphicsScene.mousePressEvent(self, event)
+            return
+        elif self.mode_ == POINT:
+            self.insertItem(AnnotationGraphicsPointItem(event.scenePos()))
+            event.accept()
+        elif self.mode_ == LINE:
+            self.mousePressed_ = event.scenePos()
+            line = QGraphicsLineItem(QLineF(event.scenePos(), event.scenePos()))
+            self.activeItem_ = line
+            self.addItem(line)
+
+            event.accept()
+        self.update()
+
+    def mouseReleaseEvent(self, event):
+        self.mousePressed_ = None
+        QGraphicsScene.mouseReleaseEvent(self, event)
+        
+    def mouseMoveEvent(self, event):
+        print LINE
+        if not self.sceneRect().contains(event.scenePos()):
+            return
+        elif self.mode_ == LINE:
+            ## TODO
+            activeItem.
+        else:
+            QGraphicsScene.mouseMoveEvent(self, event)
+
+    def insertItem(self, item):
+        self.addItem(item)