SkiaSharp 之 WPF 自绘 投篮小游戏(案例版)

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所属分类:.NET技术
摘要

此案例主要是针对光线投影法碰撞检测功能的示例,顺便做成了一个小游戏,很简单,但是,效果却很不错。


此案例主要是针对光线投影法碰撞检测功能的示例,顺便做成了一个小游戏,很简单,但是,效果却很不错。

投篮小游戏

规则,点击投篮目标点,就会有一个球沿着相关抛物线,然后,判断是否进入篮子里,其实就是一个矩形,直接是按照碰撞检测来的,碰到就算进去了,对其增加了一个分数统计等功能。

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;         }     } }); 

弹球实体代码 (Ball.cs)

public class Ball {     public double X { get; set; }     public double Y { get; set; }     public double VX { get; set; }     public double VY { get; set; }     public int Radius { get; set; } } 

粒子花园核心类 (ParticleGarden.cs)

/// <summary> /// 光线投影法碰撞检测 /// 投篮小游戏 /// </summary> public class RayProjection {     public SKPoint centerPoint;     public double G = 0.3;     public double F = 0.98;     public double Easing = 0.03;     public bool IsMoving = false;     public SKPoint CurrentMousePoint = SKPoint.Empty;     public SKPoint lastPoint = SKPoint.Empty;     public Rect Box;     public Ball Ball;     public SKCanvas canvas;     public int ALLCount = 10;     public List<bool> bools = new List<bool>();     public bool IsOver = false;     /// <summary>     /// 渲染     /// </summary>     public void Render(SKCanvas canvas, SKTypeface Font, int Width, int Height)     {         canvas.Clear(SKColors.White);         this.canvas = canvas;         centerPoint = new SKPoint(Width / 2, Height / 2);         //球         if (Ball == null)         {             Ball = new Ball()             {                 X = 50,                 Y = Height - 50,                 Radius = 30             };         }         //箱子         var boxX = Width - 170;         var boxY = Height - 80;         if (Box.X == 0)         {             Box = new Rect(boxX, boxY, 120, 70);         }         else         {             if (Box.X != boxX && Box.Y != boxY)             {                 Box.X = boxX;                 Box.Y = boxY;             }         }          if (bools.Count >= ALLCount)         {             IsOver = true;         }          if (!IsOver)         {             if (IsMoving)             {                 BallMove(Width, Height);             }             else             {                 DrawLine();             }              //弹球             DrawCircle(canvas, Ball);             //矩形             DrawRect(canvas, Box);              //计分             using var paint1 = new SKPaint             {                 Color = SKColors.Blue,                 IsAntialias = true,                 Typeface = Font,                 TextSize = 24             };             string count = $"总次数:{ALLCount} 剩余次数:{ALLCount - bools.Count} 投中次数:{bools.Count(t => t)}";             canvas.DrawText(count, 100, 20, paint1);         }         else         {             SKColor sKColor = SKColors.Blue;             //计分             var SuccessCount = bools.Count(t => t);             string count = "";             switch (SuccessCount)             {                 case 0:                     {                         count = $"太糗了吧,一个都没投中!";                         sKColor = SKColors.Black;                     }                     break;                 case 1:                 case 2:                 case 3:                 case 4:                 case 5:                     {                         count = $"你才投中:{SuccessCount}次,继续努力!";                         sKColor = SKColors.Blue;                     }                     break;                 case 6:                 case 7:                 case 8:                 case 9:                     {                         count = $"恭喜 投中:{SuccessCount}次!!!";                         sKColor = SKColors.YellowGreen;                     }                     break;                 case 10: { count = $"全部投中,你太厉害了!";                         sKColor = SKColors.Red;                     } break;             }             using var paint1 = new SKPaint             {                 Color = sKColor,                 IsAntialias = true,                 Typeface = Font,                 TextSize = 48             };             var fontCenter = paint1.MeasureText(count);             canvas.DrawText(count, centerPoint.X - fontCenter / 2, centerPoint.Y, paint1);         }         using var paint = new SKPaint         {             Color = SKColors.Blue,             IsAntialias = true,             Typeface = Font,             TextSize = 24         };         string by = $"by 蓝创精英团队";         canvas.DrawText(by, 600, 20, paint);     }     /// <summary>     /// 画一个圆     /// </summary>     public void DrawCircle(SKCanvas canvas, Ball ball)     {         using var paint = new SKPaint         {             Color = SKColors.Blue,             Style = SKPaintStyle.Fill,             IsAntialias = true,             StrokeWidth = 2         };         canvas.DrawCircle((float)ball.X, (float)ball.Y, ball.Radius, paint);     }     /// <summary>     /// 画一个矩形     /// </summary>     public void DrawRect(SKCanvas canvas, Rect box)     {         using var paint = new SKPaint         {             Color = SKColors.Green,             Style = SKPaintStyle.Fill,             IsAntialias = true,             StrokeWidth = 2         };         canvas.DrawRect((float)box.X, (float)box.Y, (float)box.Width, (float)box.Height, paint);     }     /// <summary>     /// 划线     /// </summary>     public void DrawLine()     {         //划线         using var LinePaint = new SKPaint         {             Color = SKColors.Red,             Style = SKPaintStyle.Fill,             StrokeWidth = 2,             IsStroke = true,             StrokeCap = SKStrokeCap.Round,             IsAntialias = true         };         var path = new SKPath();         path.MoveTo((float)CurrentMousePoint.X, (float)CurrentMousePoint.Y);         path.LineTo((float)Ball.X, (float)Ball.Y);         path.Close();         canvas.DrawPath(path, LinePaint);     }     public void BallMove(int Width, int Height)     {         Ball.VX *= F;         Ball.VY *= F;         Ball.VY += G;          Ball.X += Ball.VX;         Ball.Y += Ball.VY;          var hit = CheckHit();         // 边界处理和碰撞检测         if (hit || Ball.X - Ball.Radius > Width || Ball.X + Ball.Radius < 0 || Ball.Y - Ball.Radius > Height || Ball.Y + Ball.Radius < 0)         {             bools.Add(hit);             IsMoving = false;             Ball.X = 50;             Ball.Y = Height - 50;         }          lastPoint.X = (float)Ball.X;         lastPoint.Y = (float)Ball.Y;     }     public bool CheckHit()     {         var k1 = (Ball.Y - lastPoint.Y) / (Ball.X - lastPoint.X);         var b1 = lastPoint.Y - k1 * lastPoint.X;         var k2 = 0;         var b2 = Ball.Y;         var cx = (b2 - b1) / (k1 - k2);         var cy = k1 * cx + b1;         if (cx - Ball.Radius / 2 > Box.X && cx + Ball.Radius / 2 < Box.X + Box.Width && Ball.Y - Ball.Radius > Box.Y)         {             return true;         }         return false;     }     public void MouseMove(SKPoint sKPoint)     {         CurrentMousePoint = sKPoint;     }     public void MouseDown(SKPoint sKPoint)     {         CurrentMousePoint = sKPoint;     }     public void MouseUp(SKPoint sKPoint)     {         if (bools.Count < ALLCount)         {             IsMoving = true;             Ball.VX = (sKPoint.X - Ball.X) * Easing;             Ball.VY = (sKPoint.Y - Ball.Y) * Easing;             lastPoint.X = (float)Ball.X;             lastPoint.Y = (float)Ball.Y;         }     } } 

效果如下:

SkiaSharp 之 WPF 自绘 投篮小游戏(案例版)

还不错,得了7分,当然,我也可以得10分的,不过,还好了。

总结

这个特效的案例重点是光线投影法碰撞检测,同时又对其增加了游戏的属性,虽然东西都很简单,但是作为一个雏形来讲也是不错的。

SkiaSharp 基础系列算是告一段落了,基础知识相关暂时都已经有了一个深度的了解,对于它的基础应用已经有一个不错的认识了,那么,基于它的应用应该也会多起来,我这边主要参考Avalonia的内部SkiaSharp使用原理,当然,用法肯定不局限的。

代码地址

https://github.com/kesshei/WPFSkiaRayProjectionDemo.git

https://gitee.com/kesshei/WPFSkiaRayProjectionDemo.git

一键三连呦!,感谢大佬的支持,您的支持就是我的动力!

版权

蓝创精英团队(公众号同名,CSDN 同名,CNBlogs 同名)