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| Image<bgr byte=""> RotateImageS2D(Image<bgr byte=""> srcImage, double angle) | |
| { | |
| int width = srcImage.Width; | |
| int height = srcImage.Height; | |
| double theta = angle * (Math.PI/180.0); | |
| double vsin = Math.Sin(theta); | |
| double vcos = Math.Cos(theta); | |
| /////////////////////////////////////////////////////////////// | |
| // 求旋轉後圖片長寬 | |
| /////////////////////////////////////////////////////////////// | |
| // 四個頂點 | |
| int x1 = 0, y1 = 0; | |
| int x2 = srcImage.Width - 1, y2 = 0; | |
| int x3 = srcImage.Width - 1, y3 = srcImage.Height - 1; | |
| int x4 = 0, y4 = srcImage.Height - 1; | |
| // 旋轉後圖片四個頂點 | |
| int fx1 = (int)(vcos * x1 - vsin * y1); | |
| int fx2 = (int)(vcos * x2 - vsin * y2); | |
| int fx3 = (int)(vcos * x3 - vsin * y3); | |
| int fx4 = (int)(vcos * x4 - vsin * y4); | |
| int fy1 = (int)(vsin * x1 + vcos * y1); | |
| int fy2 = (int)(vsin * x2 + vcos * y2); | |
| int fy3 = (int)(vsin * x3 + vcos * y3); | |
| int fy4 = (int)(vsin * x4 + vcos * y4); | |
| // 求上下左右頂點 | |
| int fmaxX = Math.Max(fx1, Math.Max(fx2, Math.Max(fx3, fx4))); | |
| int fminX = Math.Min(fx1, Math.Min(fx2, Math.Min(fx3, fx4))); | |
| int fmaxY = Math.Max(fy1, Math.Max(fy2, Math.Max(fy3, fy4))); | |
| int fminY = Math.Min(fy1, Math.Min(fy2, Math.Min(fy3, fy4))); | |
| // 計算長寬 | |
| int fWidth = fmaxX - fminX; | |
| int fHeight = fmaxY - fminY; | |
| /////////////////////////////////////////////////////////////// | |
| // 畫出旋轉後的圖 | |
| /////////////////////////////////////////////////////////////// | |
| Image<bgr byte=""> dstImage = new Image<bgr byte="">(fWidth, fHeight); | |
| // 旋轉前後中心點差距 | |
| int dW = width / 2 - fWidth / 2; | |
| int dH = height / 2 - fHeight / 2; | |
| for (int i = 0; i < height; i++) | |
| { | |
| for (int j = 0; j < width; j++) | |
| { | |
| // 純粹好看用 | |
| double x = (double)j; | |
| double y = (double)i; | |
| // 公式 | |
| int dX = (int)(vcos * x - vsin * y - vcos / 2 * width + vsin / 2 * height + width / 2 - dW); | |
| int dY = (int)(vsin * x + vcos * y - vsin / 2 * width - vcos / 2 * height + height / 2 - dH); | |
| // 判斷有無出界 | |
| if (dX >= 0 && dX < fWidth && dY >= 0 && dY < fHeight) | |
| { | |
| dstImage[dY, dX] = srcImage[(int)y, (int)x]; | |
| } | |
| } | |
| } | |
| return dstImage; | |
| } |
