WPF+SkiaSharp实现自绘拖曳小球 WPF+SkiaSharp实现自绘拖曳小球

拖曳小球
Wpf 和 SkiaSharp
实现代码
效果如下

拖曳小球 WPF的拖曳效果，基本配置一下，就可以了，但是自绘的话，就得自己控制，按键点击，按键移动和按键松开的事件，与其配合达到目的。
这个效果实现了，其实也变相的实现了WPF里的拖动效果，这个效果用着还是很方便的。
但是代码，确十分的简单。

Wpf 和 SkiaSharp 新建一个WPF项目，然后，Nuget包即可
要添加Nuget包

Install-Package SkiaSharp.Views.WPF -Version 2.88.0

其中核心逻辑是这部分，会以我设置的60FPS来刷新当前的画板。

skContainer.PaintSurface += SkContainer_PaintSurface; _ = Task.Run(() =>{while (true){try{Dispatcher.Invoke(() =>{skContainer.InvalidateVisual(); }); _ = SpinWait.SpinUntil(() => false, 1000 / 60); //每秒60帧}catch{break; }}});

实现代码鼠标按下，移动，鼠标松开
先对SkiaSharp对象，增加相关事件

skContainer.MouseDown += SkContainer_MouseDown; skContainer.MouseUp += SkContainer_MouseUp; skContainer.MouseMove += SkContainer_MouseMove;

然后增加相关事件处理代码，我这边都统一处理了.

private void SkContainer_MouseDown(object sender, MouseButtonEventArgs e){var cur = e.GetPosition(sender as IInputElement); drawClock.MouseDown(new SKPoint((float)cur.X, (float)cur.Y), true); }private void SkContainer_MouseUp(object sender, MouseEventArgs e){var cur = e.GetPosition(sender as IInputElement); drawClock.MouseDown(new SKPoint((float)cur.X, (float)cur.Y), false); }private void SkContainer_MouseMove(object sender, MouseEventArgs e){var cur = e.GetPosition(sender as IInputElement); drawClock.MouseMove(new SKPoint((float)cur.X, (float)cur.Y)); }

拖曳核心类

/// /// 拖曳 /// public class Drag{public SKPoint centerPoint; public int Radius = 0; private bool Pressed = false; private bool CirclePressend = false; private SKPoint sKPoint = SKPoint.Empty; private SKPoint CirclePoint = SKPoint.Empty; private SKCanvas canvas; private float dx = 0; private float dy = 0; /// /// 渲染/// public void Render(SKCanvas canvas, SKTypeface Font, int Width, int Height){this.canvas = canvas; centerPoint = new SKPoint(Width / 2, Height / 2); this.Radius = 40; canvas.Clear(SKColors.White); if (CirclePoint.IsEmpty){CirclePoint = new SKPoint(centerPoint.X, centerPoint.Y); }if (CirclePressend){CirclePoint = new SKPoint(sKPoint.X - dx, sKPoint.Y - dy); DrawCircle(this.canvas, CirclePoint); }else{DrawCircle(this.canvas, CirclePoint); }using var paint = new SKPaint{Color = SKColors.Black,IsAntialias = true,Typeface = Font,TextSize = 24}; var msg = $"X:{ sKPoint.X}Y:{sKPoint.Y}Pressed:{Pressed} CirclePressend:{CirclePressend}"; canvas.DrawText(msg, 0, 30, paint); }public void MouseMove(SKPoint sKPoint){this.sKPoint = sKPoint; if (CirclePressend)//按下，就开始拖动{CirclePoint = sKPoint; }}public void MouseDown(SKPoint sKPoint, bool Pressed){this.sKPoint = sKPoint; this.Pressed = Pressed; if (this.Pressed){this.CirclePressend = CheckPoint(sKPoint, CirclePoint); if (this.CirclePressend){dx = sKPoint.X - CirclePoint.X; dy = sKPoint.Y - CirclePoint.Y; }}else{this.CirclePressend = false; }}public bool CheckPoint(SKPoint sKPoint, SKPoint CirclePoint){var d = Math.Sqrt(Math.Pow(sKPoint.X - CirclePoint.X, 2) + Math.Pow(sKPoint.Y - CirclePoint.Y, 2)); return this.Radius >= d; }/// /// 画一个圆/// public void DrawCircle(SKCanvas canvas, SKPoint sKPoint){using var paint = new SKPaint{Color = SKColors.Blue,Style = SKPaintStyle.Fill,IsAntialias = true,StrokeWidth = 2}; canvas.DrawCircle(sKPoint.X, sKPoint.Y, Radius, paint); }}

效果如下
我可以点的球的边边哦，这也是一个小技巧，点到球哪里，停止的时候，鼠标还在那个位置，是不是有点像拖动窗体的感觉了。
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