Method GradientFillRectanglePixels

canvas.go:533–567

GradientFillRectanglePixels draws a gradient filled rectangle in native pixels.

(color1, color2 Color, orientation Orientation, bounds Rectangle)

// GradientFillRectanglePixels draws a gradient filled rectangle in native pixels.
func (c *Canvas) GradientFillRectanglePixels(color1, color2 Color, orientation Orientation, bounds Rectangle) error {
	vertices := [2]win.TRIVERTEX{
		{
			X:     int32(bounds.X),
			Y:     int32(bounds.Y),
			Red:   uint16(color1.R()) * 256,
			Green: uint16(color1.G()) * 256,
			Blue:  uint16(color1.B()) * 256,
			Alpha: 0,
		}, {
			X:     int32(bounds.X + bounds.Width),
			Y:     int32(bounds.Y + bounds.Height),
			Red:   uint16(color2.R()) * 256,
			Green: uint16(color2.G()) * 256,
			Blue:  uint16(color2.B()) * 256,
			Alpha: 0,
		},
	}

	indices := win.GRADIENT_RECT{
		UpperLeft:  0,
		LowerRight: 1,
	}

	var o uint32
	if orientation == Vertical {
		o = 1
	}

	if !win.GradientFill(c.hdc, &vertices[0], 2, unsafe.Pointer(&indices), 1, o) {
		return newError("GradientFill failed")
	}

	return nil
}

// DrawText draws text at given location in 1/96" units.
//