Exemplo n.º 1
0
// AddTo returns a new ImageGraphics which will write to (width x height) sized
// area starting at (x,y) on the provided image img. The rest of the parameters
// are the same as in New().
func AddTo(img *image.RGBA, x, y, width, height int, bgcol color.RGBA, font *truetype.Font, fontsize map[chart.FontSize]float64) *ImageGraphics {
	gc := draw2d.NewGraphicContext(img)
	gc.SetLineJoin(draw2d.BevelJoin)
	gc.SetLineCap(draw2d.SquareCap)
	gc.SetStrokeColor(image.Black)
	gc.SetFillColor(bgcol)
	gc.Translate(float64(x)+0.5, float64(y)+0.5)
	gc.ClearRect(x, y, x+width, y+height)
	if font == nil {
		font = defaultFont
	}
	if len(fontsize) == 0 {
		fontsize = ConstructFontSizes(13)
	}

	return &ImageGraphics{Image: img, x0: x, y0: y, w: width, h: height, bg: bgcol, gc: gc, font: font, fs: fontsize}
}
Exemplo n.º 2
0
// New creates a new ImageGraphics including an image.RGBA of dimension w x h
// with background bgcol. If font is nil it will use a builtin font.
// If fontsize is empty useful default are used.
func New(width, height int, bgcol color.RGBA, font *truetype.Font, fontsize map[chart.FontSize]float64) *ImageGraphics {
	img := image.NewRGBA(image.Rect(0, 0, width, height))
	gc := draw2d.NewGraphicContext(img)
	gc.SetLineJoin(draw2d.BevelJoin)
	gc.SetLineCap(draw2d.SquareCap)
	gc.SetStrokeColor(image.Black)
	gc.SetFillColor(bgcol)
	gc.Translate(0.5, 0.5)
	gc.Clear()
	if font == nil {
		font = defaultFont
	}
	if len(fontsize) == 0 {
		fontsize = ConstructFontSizes(13)
	}
	return &ImageGraphics{Image: img, x0: 0, y0: 0, w: width, h: height,
		bg: bgcol, gc: gc, font: font, fs: fontsize}
}