如何将 System.Drawing.Image 旋转 x 度？

发布于 2024-12-01 03:38:29 字数 416 浏览 1 评论 0原文

我需要将汽车图像旋转 X 度以指示行驶方向。现在我有这个工作代码可以在 GDI+ 表面上绘制图像。

int hdc = Display.hDC;
IntPtr p = new IntPtr(hdc);
graphics = Graphics.FromHdc(p);
newImage = Image.FromFile(carImage);
System.Drawing.Point ulCorner = new System.Drawing.Point(x - 25, y -15);

//graphics.RotateTransform(45); //tried this line, when i used it, it drew nothing.
graphics.DrawImage(newImage, ulCorner);

如何旋转X度？

原文

I need to rotate my image of a car X degrees to indicate the direction of travel. Right now I have this working code to draw the image on a GDI+ surface.

int hdc = Display.hDC;
IntPtr p = new IntPtr(hdc);
graphics = Graphics.FromHdc(p);
newImage = Image.FromFile(carImage);
System.Drawing.Point ulCorner = new System.Drawing.Point(x - 25, y -15);

//graphics.RotateTransform(45); //tried this line, when i used it, it drew nothing.
graphics.DrawImage(newImage, ulCorner);

how to rotate X degrees?

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风透绣罗衣 2024-12-08 03:38:29

以下是旋转图像的方法

 //move rotation point to center of image
  graphics.TranslateTransform((float)newImage.Width/2,(float)newImage.Height / 2);
  //rotate
  graphics.RotateTransform(angle);
  //move image back
  graphics.TranslateTransform(-(float)newImage.Width/2,-(float)newImage.Height / 2);

Here's how to rotate an image

 //move rotation point to center of image
  graphics.TranslateTransform((float)newImage.Width/2,(float)newImage.Height / 2);
  //rotate
  graphics.RotateTransform(angle);
  //move image back
  graphics.TranslateTransform(-(float)newImage.Width/2,-(float)newImage.Height / 2);

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