如何给wpf中inkcanvas画板画笔画出的线加上动画

[冰冰九公主]

wpf 中inkcanvas画板中ink模式下，画笔画出的线，怎么加上动画，最好是画完一笔后才开始动画，这个效果怎么实现呢？动画效果就是透明度有1变为0，高手指教一下吧。

[ariesget]

在StrokeCollected的事件中加个定时器修改Stroke的Color的Alpha值。

using System.Threading;

    private Dictionary<Stroke, Timer> dicTimer = new Dictionary<Stroke, Timer>();

    private void InkCanvas_StrokeCollected(object sender, InkCanvasStrokeCollectedEventArgs e)
        {
            Timer t1= new Timer(new TimerCallback(ChangeOpacity), e.Stroke, 100, 100);
            dicTimer.Add(e.Stroke, t1);
        }

        private void ChangeOpacity(Object obj)
        {
                Stroke line = obj as Stroke;
                Color linecolor = line.DrawingAttributes.Color;
                if (linecolor.ScA > 0)
                    linecolor.ScA -= 0.1f;
                this.Dispatcher.BeginInvoke(new Action(() => { line.DrawingAttributes.Color = linecolor; }));
                if (linecolor.A <= 0)
                {
                    dicTimer[line].Dispose();
                    dicTimer.Remove(line);
                }   
        }

[冰冰九公主]

引用 3 楼 ariesget 的回复:

在StrokeCollected的事件中加个定时器修改Stroke的Color的Alpha值。

using System.Threading;

    private Dictionary<Stroke, Timer> dicTimer = new Dictionary<Stroke, Timer>();

    private void InkCanvas_StrokeCollected(object sender, InkCanvasStrokeCollectedEventArgs e)
        {
            Timer t1= new Timer(new TimerCallback(ChangeOpacity), e.Stroke, 100, 100);
            dicTimer.Add(e.Stroke, t1);
        }

        private void ChangeOpacity(Object obj)
        {
                Stroke line = obj as Stroke;
                Color linecolor = line.DrawingAttributes.Color;
                if (linecolor.ScA > 0)
                    linecolor.ScA -= 0.1f;
                this.Dispatcher.BeginInvoke(new Action(() => { line.DrawingAttributes.Color = linecolor; }));
                if (linecolor.A <= 0)
                {
                    dicTimer[line].Dispose();
                    dicTimer.Remove(line);
                }   
        }

多谢指点。帮了大忙了。嘿嘿

[冰冰九公主]

[冰冰九公主]

高手们，来人呀。