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JRobin is a 100% pure Java alternative to RRDTool, with about exactly the same specifications. If you provide the same data to RRDTool and JRobin, you will get exactly the same results and graphs. All standard RRDTool operations are supported.

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/*******************************************************************************
 * Copyright (c) 2001-2005 Sasa Markovic and Ciaran Treanor.
 * Copyright (c) 2011 The OpenNMS Group, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *******************************************************************************/
package org.jrobin.graph;

import org.jrobin.core.Util;

import java.awt.*;

class ValueAxisMrtg implements RrdGraphConstants {
	private ImageParameters im;
	private ImageWorker worker;
	private RrdGraphDef gdef;

	ValueAxisMrtg(RrdGraph rrdGraph) {
		this.im = rrdGraph.im;
		this.gdef = rrdGraph.gdef;
		this.worker = rrdGraph.worker;
		im.unit = gdef.unit;
	}

	boolean draw() {
		Font font = gdef.getFont(FONTTAG_AXIS);
		Paint mGridColor = gdef.colors[COLOR_MGRID];
		Paint fontColor = gdef.colors[COLOR_FONT];
		int labelOffset = (int) (worker.getFontAscent(font) / 2);

		if (Double.isNaN((im.maxval - im.minval) / im.magfact)) {
			return false;
		}

		int xLeft = im.xorigin;
		int xRight = im.xorigin + im.xsize;
		String labfmt;
		if (im.scaledstep / im.magfact * Math.max(Math.abs(im.quadrant), Math.abs(4 - im.quadrant)) <= 1.0) {
			labfmt = "%5.2f";
		}
		else {
			labfmt = Util.sprintf("%%4.%df", 1 - ((im.scaledstep / im.magfact > 10.0 || Math.ceil(im.scaledstep / im.magfact) == im.scaledstep / im.magfact) ? 1 : 0));
		}
		if (im.symbol != ' ' || im.unit != null) {
			labfmt += " ";
		}
		if (im.symbol != ' ') {
			labfmt += im.symbol;
		}
		if (im.unit != null) {
			labfmt += im.unit;
		}
		for (int i = 0; i <= 4; i++) {
			int y = im.yorigin - im.ysize * i / 4;
			if (y >= im.yorigin - im.ysize && y <= im.yorigin) {
				String graph_label = Util.sprintf(labfmt, im.scaledstep / im.magfact * (i - im.quadrant));
				int length = (int) (worker.getStringWidth(graph_label, font));
				worker.drawString(graph_label, xLeft - length - PADDING_VLABEL, y + labelOffset, font, fontColor);
				worker.drawLine(xLeft - 2, y, xLeft + 2, y, mGridColor, TICK_STROKE);
				worker.drawLine(xRight - 2, y, xRight + 2, y, mGridColor, TICK_STROKE);
				worker.drawLine(xLeft, y, xRight, y, mGridColor, GRID_STROKE);
			}
		}
		return true;
	}

}