/*******************************************************************************
* 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 ValueAxisLogarithmic implements RrdGraphConstants {
private static final double[][] yloglab = {
{1e9, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{1e3, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{1e1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
/* { 1e1, 1, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, */
{1e1, 1, 2.5, 5, 7.5, 0, 0, 0, 0, 0, 0, 0},
{1e1, 1, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0},
{1e1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
};
private RrdGraph rrdGraph;
private ImageParameters im;
private ImageWorker worker;
private RrdGraphDef gdef;
ValueAxisLogarithmic(RrdGraph rrdGraph) {
this.rrdGraph = rrdGraph;
this.im = rrdGraph.im;
this.gdef = rrdGraph.gdef;
this.worker = rrdGraph.worker;
}
boolean draw() {
Font font = gdef.getFont(FONTTAG_AXIS);
Paint gridColor = gdef.colors[COLOR_GRID];
Paint mGridColor = gdef.colors[COLOR_MGRID];
Paint fontColor = gdef.colors[COLOR_FONT];
int fontHeight = (int) Math.ceil(worker.getFontHeight(font));
int labelOffset = (int) (worker.getFontAscent(font) / 2);
double pixpex = (double) im.ysize / (Math.log10(im.maxval) - Math.log10(im.minval));
if (Double.isNaN(pixpex)) {
return false;
}
double minstep, pixperstep;
int minoridx = 0, majoridx = 0;
for (int i = 0; yloglab[i][0] > 0; i++) {
minstep = Math.log10(yloglab[i][0]);
for (int ii = 1; yloglab[i][ii + 1] > 0; ii++) {
if (yloglab[i][ii + 2] == 0) {
minstep = Math.log10(yloglab[i][ii + 1]) - Math.log10(yloglab[i][ii]);
break;
}
}
pixperstep = pixpex * minstep;
if (pixperstep > 5) {
minoridx = i;
}
if (pixperstep > 2 * fontHeight) {
majoridx = i;
}
}
int x0 = im.xorigin, x1 = x0 + im.xsize;
for (double value = Math.pow(10, Math.log10(im.minval)
- Math.log10(im.minval) % Math.log10(yloglab[minoridx][0]));
value <= im.maxval;
value *= yloglab[minoridx][0]) {
if (value < im.minval) {
continue;
}
int i = 0;
while (yloglab[minoridx][++i] > 0) {
int y = rrdGraph.mapper.ytr(value * yloglab[minoridx][i]);
if (y <= im.yorigin - im.ysize) {
break;
}
worker.drawLine(x0 - 1, y, x0 + 1, y, gridColor, TICK_STROKE);
worker.drawLine(x1 - 1, y, x1 + 1, y, gridColor, TICK_STROKE);
worker.drawLine(x0, y, x1, y, gridColor, GRID_STROKE);
}
}
for (double value = Math.pow(10, Math.log10(im.minval)
- (Math.log10(im.minval) % Math.log10(yloglab[majoridx][0])));
value <= im.maxval;
value *= yloglab[majoridx][0]) {
if (value < im.minval) {
continue;
}
int i = 0;
while (yloglab[majoridx][++i] > 0) {
int y = rrdGraph.mapper.ytr(value * yloglab[majoridx][i]);
if (y <= im.yorigin - im.ysize) {
break;
}
worker.drawLine(x0 - 2, y, x0 + 2, y, mGridColor, TICK_STROKE);
worker.drawLine(x1 - 2, y, x1 + 2, y, mGridColor, TICK_STROKE);
worker.drawLine(x0, y, x1, y, mGridColor, GRID_STROKE);
String graph_label = Util.sprintf("%3.0e", value * yloglab[majoridx][i]);
int length = (int) (worker.getStringWidth(graph_label, font));
worker.drawString(graph_label, x0 - length - PADDING_VLABEL, y + labelOffset, font, fontColor);
}
}
return true;
}
}