Part VIII: Graphics Programming and Animation in Java

Implementation EAN 13 in Java Part VIII: Graphics Programming and Animation
Part VIII: Graphics Programming and Animation
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The intersection of an ellipse and a rectangle yields a rounded rectangle.
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The second way of drawing a rounded rectangle is to use the drawRoundRectComplex() method, which allows you to independently de ne the radius of each of the four corners of your rectangle. This method is way cooler, but it s undocumented, so if you want to be conservative, you might steer clear of it. But at this point the rectangle will boldly go where no rounded rectangle has gone before:
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function drawRoundRectComplex(x:Number, y:Number, width:Number, height:Number, topLeftRadius:Number, topRightRadius:Number, bottomLeftRadius:Number, bottomRightRadius:Number):void
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The parameters are pretty self-explanatory. Besides letting you create rectangles with different amounts of rounding on each corner, drawRoundRectComplex() is just a lot simpler to think about. On the other hand, it only lets you use circular corners but I think the elliptical corners tend to look horrendous. Now you ll put all these primitives to use in a bigger example.
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Example: A Drawing Application
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Using what you ve learned about the drawing API so far, you can create a simple drawing application. This simple application consists of three classes: the ColorPicker, the ToolSet, and the DrawingCanvas. The DrawingCanvas contains both the tool set and the color picker, and it uses events to set the color and tool when these are clicked. It also handles mouse interaction, creating a new curShape when you press the mouse, and updating it as you move the mouse, depending on the tool, color, and other parameters. Example 35-15 shows the application, all at once.
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35: Programming Vector Graphics
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A Drawing Application
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package { import flash.display.Sprite; public class ch35ex15 extends Sprite { public function ch35ex15() { addChild(new DrawingCanvas(stage)); } } } import flash.display.*; import*; import flash.geom.Point; import flash.ui.Keyboard; class DrawingCanvas extends Sprite { private var canvas:Sprite; private var toolState:String = "pen"; private var curShape:Shape; private var curColor:uint; private var lineThickness:Number = 4; private var colorPicker:ColorPicker; private var toolSet:ToolSet; private var origin:Point = new Point(); public function DrawingCanvas(_stage:Stage) { canvas = new Sprite();, 1);, 0, _stage.stageWidth, _stage.stageHeight);; addChild(canvas); _stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown); canvas.addEventListener(MouseEvent.MOUSE_DOWN, startDraw); canvas.addEventListener(MouseEvent.MOUSE_UP, stopDraw); colorPicker = new ColorPicker(); addChild(colorPicker); colorPicker.x = 0; colorPicker.addEventListener("colorSelected", changeColor); toolSet = new ToolSet(); addChild(toolSet); toolSet.y = 100; toolSet.x = 5; toolSet.addEventListener("toolSelected", changeTool); curShape = new Shape(); } private function onKeyDown(event:KeyboardEvent):void { switch (event.keyCode) { case Keyboard.UP: lineThickness++; break;
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Part VIII: Graphics Programming and Animation
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case Keyboard.DOWN: lineThickness = Math.max(0, lineThickness-1); break; } } private function stopDraw(mouseEvent:MouseEvent):void { canvas.removeEventListener(MouseEvent.MOUSE_MOVE, draw); } private function startDraw(mouseEvent:MouseEvent):void { curShape = new Shape(); origin.x = canvas.mouseX; origin.y = canvas.mouseY; addChild(curShape); canvas.addEventListener(MouseEvent.MOUSE_MOVE, draw); if(toolState == "line" || toolState == "pen" || toolState == "eraser") {, mouseEvent.stageY); } } private function draw(mouseEvent:MouseEvent):void { var cursor:Point = new Point(canvas.mouseX, canvas.mouseY); var dist:Point = cursor.subtract(origin); switch(toolState) { case "pen":, curColor);, mouseEvent.stageY); break; case "line":;, curColor);, origin.y);, mouseEvent.stageY); break; case "ellipse":;, 1);, origin.y, dist.x, dist.y); break; case "rect":;, 1);, origin.y, dist.x, dist.y); break; case "roundrect":; if (dist.x < 0 || dist.y < 0) break;, 1);, origin.y, dist.x, dist.y, lineThickness, lineThickness); break; case "eraser":, curColor);
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