WINFORM FORM/CONTROL不规则形状
主要思路是通过图片获取目标形状GraphicsPath,并赋值给Form或Control的Region属性。
1. 通过SetStyle设置支持透明背景
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
UpdateStyles();
2. 设置Size
control.Width = bitmap.Width;
control.Height = bitmap.Height;
3. FormBorderStyle.None(限Form)
form.FormBorderStyle = FormBorderStyle.None;
4. 获取图形路径
private static GraphicsPath CalculateControlGraphicsPath(Bitmap bitmap)
{
// Create GraphicsPath for our bitmap calculation
//创建 GraphicsPath
GraphicsPath graphicsPath = new GraphicsPath();
// Use the top left pixel as our transparent color
//使用左上角的一点的颜色作为我们透明色
Color colorTransparent = bitmap.GetPixel(0, 0);
// This is to store the column value where an opaque pixel is first found.
// This value will determine where we start scanning for trailing opaque pixels.
//第一个找到点的X
int colOpaquePixel = 0;
// Go through all rows (Y axis)
// 偏历所有行(Y方向)
for (int row = 0; row < bitmap.Height; row++)
{
// Reset value
//重设
colOpaquePixel = 0;
// Go through all columns (X axis)
//偏历所有列(X方向)
for (int col = 0; col < bitmap.Width; col++)
{
// If this is an opaque pixel, mark it and search for anymore trailing behind
//如果是不需要透明处理的点则标记,然后继续偏历
if (bitmap.GetPixel(col, row) != colorTransparent)
{
// Opaque pixel found, mark current position
//记录当前
colOpaquePixel = col;
// Create another variable to set the current pixel position
//建立新变量来记录当前点
int colNext = col;
// Starting from current found opaque pixel, search for anymore opaque pixels
// trailing behind, until a transparent pixel is found or minimum width is reached
///从找到的不透明点开始,继续寻找不透明点,一直到找到或则达到图片宽度
for (colNext = colOpaquePixel; colNext < bitmap.Width; colNext++)
if (bitmap.GetPixel(colNext, row) == colorTransparent)
break;
// Form a rectangle for line of opaque pixels found and add it to our graphics path
//将不透明点加到graphics path
graphicsPath.AddRectangle(new Rectangle(colOpaquePixel, row, colNext - colOpaquePixel, 1));
// No need to scan the line of opaque pixels just found
col = colNext;
}
}
}
// Return calculated graphics path
return graphicsPath;
}
5. Control.Region
control.Region = new Region(graphicsPath);
6. 设置图片(图片可后续更换)
form.BackgroundImage = bitmap;
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