Method getBlankProcessor

ij/src/main/java/ij/gui/Plot.java:2168–2208

Creates the processor if not existing, clears the background and prepares it for plotting. Also called by the PlotWindow class to prepare the window.

()

	/** Creates the processor if not existing, clears the background and prepares
	 *	it for plotting. Also called by the PlotWindow class to prepare the window. */
	@AstroImageJ(reason = "Support scaling plots")
	ImageProcessor getBlankProcessor() {
		makeMarginValues();
		//IJ.log("Plot.getBlankPr preferredH="+preferredPlotHeight+" pp.h="+pp.height);
		if (pp.width <= 0 || pp.height <= 0) {
			pp.width = sc(preferredPlotWidth) + leftMargin + rightMargin;
			pp.height = sc(preferredPlotHeight) + topMargin + bottomMargin;
		}
		frameWidth = pp.width - (leftMargin + rightMargin);
		frameHeight = pp.height - (topMargin + bottomMargin);
		scaleFrame();
		boolean isColored = isColored();	//color, not grayscale required?
		if (ip == null || pp.width != ip.getWidth() || pp.height != ip.getHeight() || (isColored != (ip instanceof ColorProcessor))) {
			if (isColored) {
				ip = new ColorProcessor(pp.width, pp.height);
			} else {
				ip = new ByteProcessor(pp.width, pp.height);
				invertedLut = Prefs.useInvertingLut && !Interpreter.isBatchMode() && IJ.getInstance()!=null;
				if (invertedLut) ip.invertLut();
			}
			if (imp != null && stack == null)
				imp.setProcessor(ip);
		}
		if (ip instanceof ColorProcessor)
			Arrays.fill((int[])(ip.getPixels()), 0xffffff);
		else
			Arrays.fill((byte[])(ip.getPixels()), invertedLut ? (byte)0 : (byte)0xff);

		ip.setFont(scFont(defaultFont));
		ip.setLineWidth(sc(1));
		ip.setAntialiasedText(pp.antialiasedText);
		frame = new Rectangle(leftMargin, topMargin, frameWidth+1, frameHeight+1);
		if (pp.frame.color2 != null) {	//background color
			ip.setColor(pp.frame.color2);
			ip.setRoi(frame);
			ip.fill();
			ip.resetRoi();
		}
		ip.setColor(Color.black);
		return ip;
	}

	@AstroImageJ(reason = "Support scaling plots")
	void scaleFrame() {