需要能够用鼠标绘制箭头并能够选择它

Question

我正在尝试创建一个Flash应用程序，允许用户使用鼠标在屏幕/画布上绘制箭头。因此，如果他们在坐标23,12处单击并按住鼠标左键并在84,45处释放左按钮，则将在2个点之间绘制一条线，并在第二个坐标处使用箭头。

我还需要每个箭头都可以选择，以便可以移动或删除它们（我知道如何做这个部分！）。

如果有人可以帮助我并指出我正确的方向（例如示例或教程），我们将不胜感激！

Answer 1

因为这是你的第一个问题：

package
{
    import flash.display.CapsStyle;
    import flash.display.Graphics;
    import flash.display.JointStyle;
    import flash.display.LineScaleMode;
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.geom.Point;

    [SWF(percentWidth = 100, percentHeight = 100, backgroundColor = 0xefefef, frameRate = 30)]
    public class Arrows extends Sprite
    {

        public var arrows:Vector.<Sprite> = new Vector.<Sprite>();

        public var canvas:Sprite;

        public var lineColor:uint = Math.random() * 0xffffff;

        public var lineWeight:Number = 5;

        private var startPoint:Point;


        public function Arrows()
        {
            super();

            addEventListener(Event.ADDED_TO_STAGE, addedToStageHandler);
        }

        protected function addedToStageHandler(event:Event):void
        {
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;

            addCanvas();
        }

        protected function addCanvas():void
        {
            canvas = new Sprite();
            addChild(canvas);

            lineColor = Math.random() * 0xffffff;

            // give alpha for interaction
            var g:Graphics = canvas.graphics;
            g.beginFill(0x0, 0.0);
            g.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
            g.endFill();

            // listen for mouse down
            canvas.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
        }

        protected function mouseDownHandler(event:MouseEvent):void
        {
            canvas.removeEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);

            // mark start point
            startPoint = new Point(event.localX, event.localY);

            // start rendering
            canvas.addEventListener(Event.ENTER_FRAME, enterFrameHandler);

            // listen for mouse up / out to end arrow
            canvas.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
            canvas.addEventListener(MouseEvent.MOUSE_OUT, mouseUpHandler);
        }

        protected function enterFrameHandler(event:Event):void
        {
            var angle:Number = polarAngle(new Point(mouseX, mouseY), new Point(startPoint.x, startPoint.y));

            // draw line
            var g:Graphics = canvas.graphics;
            g.clear();

            // give alpha for interaction
            g.beginFill(0x0, 0.0);
            g.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
            g.endFill();

            g.lineStyle(lineWeight, lineColor, 1, true, LineScaleMode.NORMAL, CapsStyle.SQUARE, JointStyle.MITER);
            g.moveTo(startPoint.x, startPoint.y);
            g.lineTo(mouseX, mouseY);

            // draw arrow head
            g.moveTo(mouseX - (20 * Math.cos((angle - 45) * Math.PI / 180)),
                     mouseY - (20 * Math.sin((angle - 45) * Math.PI / 180)));

            g.lineTo(mouseX + (5 * Math.cos((angle) * Math.PI / 180)),
                     mouseY + (5 * Math.sin((angle) * Math.PI / 180)));

            g.lineTo(mouseX - (20 * Math.cos((angle + 45) * Math.PI / 180)),
                     mouseY - (20 * Math.sin((angle + 45) * Math.PI / 180)));
        }

        protected function polarAngle(point:Point, center:Point=null):Number
        {
            if (!center)
                center = new Point(0, 0);

            return Math.atan2(point.y - center.y, point.x - center.x) * 180 / Math.PI;
        }

        protected function mouseUpHandler(event:MouseEvent):void
        {
            canvas.removeEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
            canvas.removeEventListener(MouseEvent.MOUSE_OUT, mouseUpHandler);

            // stop rendering
            canvas.removeEventListener(Event.ENTER_FRAME, enterFrameHandler);

            // push canvas to arrows collection
            arrows.push(canvas);

            // add a fresh canvas
            addCanvas();
        }

    }
}

你说你知道如何移动它们，所以我会把它留给你。