实现这样的效果怎么做呀
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
GraphicsPath gp1 = null;
GraphicsPath gp2 = null;
GraphicsPath gp3 = null;
public Form1()
{
InitializeComponent();
}
private void Form1_Resize(object sender, EventArgs e)
{
Bitmap bit = new Bitmap(panel3.Width, panel3.Height);
Graphics g = Graphics.FromImage(bit);
g.Clear(Color.Transparent);
g.DrawImage(Properties.Resources._1, 0, 0, panel3.Height, panel3.Width);
gp1 = GetTransparentBounds(bit);
g.Clear(Color.Transparent);
g.DrawImage(Properties.Resources._2, 0, 0, panel3.Height, panel3.Width);
gp2 = GetTransparentBounds(bit);
g.Clear(Color.Transparent);
g.DrawImage(Properties.Resources._3, 0, 0, panel3.Height, panel3.Width);
gp3 = GetTransparentBounds(bit);
g.DrawImage(Properties.Resources._1, 0, 0, panel3.Height, panel3.Width);
g.DrawImage(Properties.Resources._2, 0, 0, panel3.Height, panel3.Width);
g.DrawImage(Properties.Resources._3, 0, 0, panel3.Height, panel3.Width);
panel3.BackgroundImage = bit;
}
public GraphicsPath GetTransparentBounds(Bitmap source)
{
GraphicsPath gp = new GraphicsPath();
for (int i = 0; i < source.Width; i++)
{
for (int j = 0; j < source.Height; j++)
{
Color cl;
cl = source.GetPixel(i, j);
if (cl.A != 0)
{
gp.AddRectangle(new Rectangle(i, j, 1, 1));
}
}
}
return gp;
}
private void panel3_MouseMove(object sender, MouseEventArgs e)
{
if (gp1.PathPoints.Contains(e.Location) ){ MessageBox.Show("gp1"); };
if (gp2.PathPoints.Contains(e.Location)) { MessageBox.Show("gp2"); };
if (gp3.PathPoints.Contains(e.Location)) { MessageBox.Show("gp3"); };
}
}
}
BitmapData bitmapData=source.LockBits(new Rectangle(0,0,source.Width,source.Height), System.Drawing.Imaging.ImageLockMode.ReadWrite, source.PixelFormat);
public unsafe Color GetPixel(int x,int y)
{
if (bitmapData.PixelFormat == PixelFormat.Format32bppRgb
[解决办法]
bitmapData.PixelFormat == PixelFormat.Format32bppArgb)
{
byte* numPtr = (byte*)((int)bitmapData.Scan0 + y * bitmapData.Stride + x * 4);
return Color.FromArgb(numPtr[3],numPtr[2], numPtr[1],numPtr[0]);
}
if (bitmapData.PixelFormat == PixelFormat.Format24bppRgb)
{
byte* numPtr2 = (byte*)((int)bitmapData.Scan0 + y * bitmapData.Stride + x * 3);
return Color.FromArgb(numPtr2[2], numPtr2[1], numPtr2[0]);
}
return Color.Empty;
}
