在表单上绘制点

Question

我想绘制点透明的图像上的点。就像我可以看到他们在哪个区域一样。有没有什么办法在C＃.net平台上这样做？

谢谢。

Answer 1

这是一种方法。

Image bitmap = new Bitmap(100, 100); // sample image, load your real image from file here 
using (var g = Graphics.FromImage(bitmap)) 
{ 
    g.FillRectangle(Brushes.Red, new Rectangle(0, 0, bitmap.Width, bitmap.Height)); // Just to fill the background on the sample image, remove this 

    var transparentColor = Color.FromArgb(127, Color.Blue); // Create a semitransparent color 
    using(Brush brush = new SolidBrush(transparentColor)) 
    { 
     // Create the dot 
     g.FillEllipse(brush, new Rectangle(10, 10, 25, 25)); 

     // Create another dot 
     g.FillEllipse(brush, new Rectangle(25, 15, 25, 25)); 
    } 
} 

myPictureBox.Image = bitmap; // display the image in an Imagebox (optional, you might use your image somewhere else)