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类Path为一条几何路径,可以通过直线,二次曲线,三次曲线来构成任意路径。Path提供了moveTo,lineTo,curveTo,curveToCubic,closePath方法来构成路径。
下面的例子动态显示一条Bezier曲线。
/** * The animation thread. */ Thread _thread; bool _drawn; /** * The random number generator. */ readonly Random _random = new Random(); /** * The animated path */ readonly Path _path = new Path(); /** * Red brush used to fill the path. */ readonly SolidBrush _brush = new SolidBrush(Color.Red); const int numpts = 6; readonly int[] _animpts = new int[Numpts * 2]; readonly int[] _deltas = new int[Numpts * 2]; private void Beziers() { Reset(screenWidth,screenHeight); _thread = new Thread(RunBeziers); _thread.Start(); } private void RunBeziers() { Thread me = Thread.CurrentThread; if (!_drawn) { lock (this) { graphics2D.Clear(Color.WhitE); graphics2D.Fill(_brush,_path); _drawn = true; } } while (_thread == mE) { DrawDemo(screenWidth,screenHeight); } } /** * Generates new points for the path. */ private void Animate(int[] pts,int[] deltas,int i,int limit) { int newpt = pts[i] + deltas[i]; if (newpt <= 0) { newpt = -newpt; deltas[i] = (_random.Next() & 0x00000003) + 2; } else if (newpt >= limit) { newpt = 2 * limit - newpt; deltas[i] = -((_random.Next() & 0x00000003) + 2); } pts[i] = newpt; } /** * Resets the animation data. */ private void Reset(int w,int h) { for (int i = 0; i < _animpts.Length; i += 2) { _animpts[i + 0] = (_random.Next() & 0x00000003) * w / 2; _animpts[i + 1] = (_random.Next() & 0x00000003) * h / 2; _deltas[i + 0] = (_random.Next() & 0x00000003) * 6 + 4; _deltas[i + 1] = (_random.Next() & 0x00000003) * 6 + 4; if (_animpts[i + 0] > w / 2) { _deltas[i + 0] = -_deltas[i + 0]; } if (_animpts[i + 1] > h / 2) { _deltas[i + 1] = -_deltas[i + 1]; } } } /** * Sets the points of the path and draws and fills the path. */ private void DrawDemo(int w,int h) { for (int i = 0; i < _animpts.Length; i += 2) { Animate(_animpts,_deltas,i + 0,w); Animate(_animpts,i + 1,h); } //Generates the new pata data. _path.Reset(); int[] ctrlpts = _animpts; int len = ctrlpts.Length; int prevx = ctrlpts[len - 2]; int prevy = ctrlpts[len - 1]; int curx = ctrlpts[0]; int cury = ctrlpts[1]; int midx = (curx + prevX) / 2; int midy = (cury + prevy) / 2; _path.MoveTo(midx,midy); for (int i = 2; i <= ctrlpts.Length; i += 2) { int x1 = (curx + midX) / 2; int y1 = (cury + midy) / 2; prevx = curx; prevy = cury; if (i < ctrlpts.Length) { curx = ctrlpts[i + 0]; cury = ctrlpts[i + 1]; } else { curx = ctrlpts[0]; cury = ctrlpts[1]; } midx = (curx + prevX) / 2; midy = (cury + prevy) / 2; int x2 = (prevx + midX) / 2; int y2 = (prevy + midy) / 2; _path.CurveTo(x1,y1,x2,y2,midx,midy); } _path.ClosePath(); // clear the clipRect area before production graphics2D.Clear(Color.WhitE); graphics2D.Fill(_brush,_path); refreshBitmap(); }
其中实时更新图像需要CompositionTarget.Rendering事件来处理。CompositionTarget.Rendering += CompositionTargetRendering;
private void CompositionTargetRendering(object sender,EventArgs E) { bmp.Invalidate(); }
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