LinearGradientBrush
public LinearGradientBrush(Rectangle rect, Color color1, Color color2, LinearGradientMode linearGradientMode)
public LinearGradientBrush(Rectangle rect, Color color1, Color color2, float angle, bool isAngleScaleable)
public LinearGradientBrush(RectangleF rect, Color color1, Color color2, LinearGradientMode linearGradientMode)
public LinearGradientBrush(RectangleF rect, Color color1, Color color2, float angle, bool isAngleScaleable)