Method drawBarChart

ij/src/main/java/ij/gui/Plot.java:3486–3535

Draw a bar at each point

(PlotObject plotObject)

	/** Draw a bar at each point */
	void drawBarChart(PlotObject plotObject) {
		int n = Math.min(plotObject.xValues.length, plotObject.yValues.length);
		String[] xCats = labelsInBraces('x'); // do we have categories at the x axis instead of numbers?
		boolean separatedBars = plotObject.shape == SEPARATED_BAR || xCats != null;
		int halfBarWidthInPixels = n <= 1 ? Math.max(1, frameWidth/2-2) : 0;
		if (separatedBars && n > 1)
			halfBarWidthInPixels = Math.max(1, (int)Math.round(Math.abs
				(0.5*(plotObject.xValues[n-1] - plotObject.xValues[0])/(n-1) * xScale * SEPARATED_BAR_WIDTH)));
		int y0 = scaleYWithOverflow(0);
		boolean yZeroInFrame = !logYAxis && yBasePxl>frame.y && yBasePxl<frame.y+frame.height;
		int prevY = y0;
		for (int i = 0; i < n; i++) {
			int left=0, right=0;
			if (halfBarWidthInPixels == 0) {         //bar boundaries in the middle between successive x values
				left = scaleX(i > 0 ? 0.5f*(plotObject.xValues[i-1]+plotObject.xValues[i]) :
						1.5f*plotObject.xValues[i] - 0.5f*plotObject.xValues[i+1]);
				right = scaleX(i < n-1 ? 0.5f*(plotObject.xValues[i]+plotObject.xValues[i+1]) :
						1.5f*plotObject.xValues[i] - 0.5f*plotObject.xValues[i-1]);
			} else {
				int x = scaleX(plotObject.xValues[i]);
				left = x - halfBarWidthInPixels;     //separated bars or n<=1 : fixed bar width
				right = x + halfBarWidthInPixels;
			}
			if (left < frame.x) left = frame.x;
			if (left > frame.x+frame.width) left = frame.x+frame.width;
			if (right < frame.x) right = frame.x;
			if (right > frame.x+frame.width) right = frame.x+frame.width;
			int y = scaleYWithOverflow(plotObject.yValues[i]);
			if (plotObject.color2 != null) {
				ip.setColor(plotObject.color2);
				for (int x2 = Math.min(left,right); x2 <= Math.max(left,right); x2++)
					ip.drawLine(x2, y0, x2, y);      //cant use ip.fillRect (ignores the clipRect), so we it fill line by line
			}
			ip.setColor(plotObject.color);
			ip.setLineWidth(sc(plotObject.lineWidth));
			if (separatedBars) {
				ip.drawLine(left, y0, left, y);      //up
				ip.drawLine(left, y, right, y);      //right
				ip.drawLine(right, y, right, y0);    //down
				if (yZeroInFrame)
					ip.drawLine(left, y0, right, y0);//baseline
			} else {
				ip.drawLine(left, prevY, left, y);   //up or down
				ip.drawLine(left, y, right, y);      //right
				if (i == n - 1)
					ip.drawLine(right, y, right, y0);//last down
				prevY = y;
			}
		}
	}

	/** Draw the symbol for the data point number 'pointIndex' (pointIndex < 0 when drawing the legend) */
	@AstroImageJ(reason = "Restore lineWidth for dots to support bolded datum and MP style; custom plot shapes", modified = true)