System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),Color.Black,Color.DarkRed,1.2f,true);

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System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),Color.Black,Color.DarkRed,1.2f,true);

System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),Color.Black,Color.DarkRed,1.2f,true);
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),Color.Black,Color.DarkRed,1.2f,true);

System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),Color.Black,Color.DarkRed,1.2f,true);
LinearGradientBrush 构造函数 (Rectangle, Color, Color, Single, Boolean)
根据矩形、起始颜色和结束颜色以及方向角度,创建 LinearGradientBrush 类的新实例.
public LinearGradientBrush(
\x09Rectangle rect,
\x09Color color1,
\x09Color color2,
\x09float angle,
\x09bool isAngleScaleable
)
参数
rect
类型：System.Drawing.Rectangle
一个 Rectangle 结构,它指定线性渐变的界限.
color1
类型：System.Drawing.Color
表示渐变起始色的 Color 结构.
color2
类型：System.Drawing.Color
表示渐变结束色的 Color 结构.
angle
类型：System.Single
渐变方向线的角度（从 X 轴以顺时针角度计算）.
isAngleScaleable
类型：System.Boolean
设置为 true,指定角度受与此 LinearGradientBrush 关联的变换所影响；否则为 false.
备注
与方向线垂直的任何一条线上的所有点为同一颜色.
起始线与方向线垂直,并经过矩形的一个角. 起始线上的所有点均为起始颜色. 结束线与方向线垂直,并经过矩形的一个角. 结束线上的所有点均为结束颜色.
方向线的角度决定起始线和结束线经过的角. 例如,如果该角度介于 0 和 90 度之间,则起始线经过左上角,结束线经过右下角.

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