Golang render.Color類代碼示例

// DrawText is a convenience function that will create a new image, render
// the provided text to it, paint the image to the provided window, and resize
// the window to fit the text snugly.
//
// An error can occur when rendering the text to an image.
func DrawText(win *xwindow.Window, font *truetype.Font, size float64,
	fontClr, bgClr render.Color, text string) error {

	// Over estimate the extents.
	ew, eh := xgraphics.TextMaxExtents(font, size, text)
	eh += misc.TextBreathe // <-- this is the bug

	// Create an image using the over estimated extents.
	img := xgraphics.New(win.X, image.Rect(0, 0, ew, eh))
	xgraphics.BlendBgColor(img, bgClr.ImageColor())

	// Now draw the text, grab the (x, y) position advanced by the text, and
	// check for an error in rendering.
	x, y, err := img.Text(0, 0, fontClr.ImageColor(), size, font, text)
	if err != nil {
		return err
	}

	// Resize the window to the geometry determined by (x, y).
	w, h := x, y+misc.TextBreathe // <-- also part of the bug
	win.Resize(w, h)

	// Now draw the image to the window and destroy it.
	img.XSurfaceSet(win.Id)
	subimg := img.SubImage(image.Rect(0, 0, w, h))
	subimg.XDraw()
	subimg.XPaint(win.Id)
	img.Destroy()

	return nil
}

// DrawText is a convenience function that will create a new image, render
// the provided text to it, paint the image to the provided window, and resize
// the window to fit the text snugly.
//
// An error can occur when rendering the text to an image.
func DrawText(win *xwindow.Window, font *truetype.Font, size float64,
	fontClr, bgClr render.Color, text string) error {

	// BUG(burntsushi): If `text` is zero-length, very bad things happen.
	if len(text) == 0 {
		text = " "
	}

	// Over estimate the extents.
	ew, eh := xgraphics.Extents(font, size, text)

	// Create an image using the over estimated extents.
	img := xgraphics.New(win.X, image.Rect(0, 0, ew, eh))
	xgraphics.BlendBgColor(img, bgClr.ImageColor())

	// Now draw the text, grab the (x, y) position advanced by the text, and
	// check for an error in rendering.
	_, _, err := img.Text(0, 0, fontClr.ImageColor(), size, font, text)
	if err != nil {
		return err
	}

	// Resize the window to the geometry determined by (x, y).
	win.Resize(ew, eh)

	// Now draw the image to the window and destroy it.
	img.XSurfaceSet(win.Id)
	// subimg := img.SubImage(image.Rect(0, 0, ew, eh))
	img.XDraw()
	img.XPaint(win.Id)
	img.Destroy()

	return nil
}

func setGradient(k wini.Key, clr *render.Color) {
	// Check to make sure we have a value for this key
	vals := k.Strings()
	if len(vals) == 0 {
		logger.Warning.Println(k.Err("No values found."))
		return
	}

	// Use the last value
	val := vals[len(vals)-1]

	// If there are no spaces, it can't be a gradient.
	if strings.Index(val, " ") == -1 {
		if start, ok := getLastInt(k); ok {
			clr.ColorSet(start)
		}
		return
	}

	// Okay, now we have to do things manually.
	// Split up the value into two pieces separated by whitespace and parse
	// each piece as an int.
	splitted := strings.Split(val, " ")
	if len(splitted) != 2 {
		logger.Warning.Println(k.Err("Expected a gradient value (two colors "+
			"separated by a space), but found '%s' "+
			"instead.", val))
		return
	}

	start, err := strconv.ParseInt(strings.TrimSpace(splitted[0]), 0, 0)
	if err != nil {
		logger.Warning.Println(k.Err("'%s' is not an integer. (%s)",
			splitted[0], err))
		return
	}

	end, err := strconv.ParseInt(strings.TrimSpace(splitted[1]), 0, 0)
	if err != nil {
		logger.Warning.Println(k.Err("'%s' is not an integer. (%s)",
			splitted[1], err))
		return
	}

	// finally...
	clr.GradientSet(int(start), int(end))
}

func setNoGradient(k wini.Key, clr *render.Color) {
	// Check to make sure we have a value for this key
	vals := k.Strings()
	if len(vals) == 0 {
		logger.Warning.Println(k.Err("No values found."))
		return
	}

	// Use the last value
	val := vals[len(vals)-1]

	// If there are no spaces, it can't be a gradient.
	if strings.Index(val, " ") == -1 {
		if start, ok := getLastInt(k); ok {
			clr.ColorSet(start)
		}
		return
	}

	logger.Warning.Println(
		k.Err("Gradients are not supported for this theme option."))
}