package org.rrd4j.graph;
import org.rrd4j.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, 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(rrdGraph.getFontHeight(FONTTAG_AXIS));
int labelOffset = (int) (worker.getFontAscent(font) / 2);
double pixpex = (double) im.ysize / (log10(im.maxval) - 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 = log10(yloglab[i][0]);
for (int ii = 1; yloglab[i][ii + 1] > 0; ii++) {
if (yloglab[i][ii + 2] == 0) {
minstep = log10(yloglab[i][ii + 1]) - log10(yloglab[i][ii]);
break;
}
}
pixperstep = pixpex * minstep;
if (pixperstep > 5) {
minoridx = i;
}
if (pixperstep > 2 * fontHeight) {
majoridx = i;
}
}
// Draw minor grid for positive values
double positiveMin = (im.minval > 0.0) ? im.minval : 0.0;
int x0 = im.xorigin, x1 = x0 + im.xsize;
for (double value = Math.pow(10, log10(positiveMin)
- log10(positiveMin) % log10(yloglab[minoridx][0]));
value <= im.maxval;
value *= yloglab[minoridx][0]) {
if (value < positiveMin) 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, gdef.tickStroke);
worker.drawLine(x1 - 1, y, x1 + 1, y, gridColor, gdef.tickStroke);
worker.drawLine(x0, y, x1, y, gridColor, gdef.gridStroke);
}
}
// Draw minor grid for negative values
double negativeMin = -1.0 * ((im.maxval < 0.0) ? im.maxval : 0.0);
for (double value = Math.pow(10, log10(negativeMin)
- log10(negativeMin) % log10(yloglab[minoridx][0]));
value <= -1.0 * im.minval;
value *= yloglab[minoridx][0]) {
if (value < negativeMin) continue;
int i = 0;
while (yloglab[minoridx][++i] > 0) {
int y = rrdGraph.mapper.ytr(-1.0 * value * yloglab[minoridx][i]);
if (y <= im.yorigin - im.ysize) {
break;
}
worker.drawLine(x0 - 1, y, x0 + 1, y, gridColor, gdef.tickStroke);
worker.drawLine(x1 - 1, y, x1 + 1, y, gridColor, gdef.tickStroke);
worker.drawLine(x0, y, x1, y, gridColor, gdef.gridStroke);
}
}
// If it has positive and negative, always have a tick mark at 0
boolean skipFirst = false;
if (im.minval < 0.0 && im.maxval > 0.0) {
skipFirst = true;
int y = rrdGraph.mapper.ytr(0.0);
worker.drawLine(x0 - 2, y, x0 + 2, y, mGridColor, gdef.tickStroke);
worker.drawLine(x1 - 2, y, x1 + 2, y, mGridColor, gdef.tickStroke);
worker.drawLine(x0, y, x1, y, mGridColor, gdef.gridStroke);
String graph_label = Util.sprintf(gdef.locale, "%3.0e", 0.0);
int length = (int) (worker.getStringWidth(graph_label, font));
worker.drawString(graph_label, x0 - length - PADDING_VLABEL, y + labelOffset, font, fontColor);
}
// Draw major grid for positive values
int iter = 0;
for (double value = Math.pow(10, log10(positiveMin)
- (log10(positiveMin) % log10(yloglab[majoridx][0])));
value <= im.maxval;
value *= yloglab[majoridx][0]) {
if (value < positiveMin) {
continue;
}
++iter;
if (skipFirst && iter == 1) {
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, gdef.tickStroke);
worker.drawLine(x1 - 2, y, x1 + 2, y, mGridColor, gdef.tickStroke);
worker.drawLine(x0, y, x1, y, mGridColor, gdef.gridStroke);
String graph_label = Util.sprintf(gdef.locale, "%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);
}
}
// Draw major grid for negative values
iter = 0;
for (double value = Math.pow(10, log10(negativeMin)
- (log10(negativeMin) % log10(yloglab[majoridx][0])));
value <= -1.0 * im.minval;
value *= yloglab[majoridx][0]) {
if (value < negativeMin) {
continue;
}
++iter;
if (skipFirst && iter == 1) {
continue;
}
int i = 0;
while (yloglab[majoridx][++i] > 0) {
int y = rrdGraph.mapper.ytr(-1.0 * value * yloglab[majoridx][i]);
if (y <= im.yorigin - im.ysize) {
break;
}
worker.drawLine(x0 - 2, y, x0 + 2, y, mGridColor, gdef.tickStroke);
worker.drawLine(x1 - 2, y, x1 + 2, y, mGridColor, gdef.tickStroke);
worker.drawLine(x0, y, x1, y, mGridColor, gdef.gridStroke);
String graph_label = Util.sprintf(gdef.locale, "%3.0e", -1.0 * 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;
}
/**
* Compute logarithm for the purposes of y-axis.
*/
static double log10(double v) {
if (v > 0.0) {
return Math.log10(v);
} else if (v < 0.0) {
return -1.0 * Math.log10(-1.0 * v);
} else {
return 0.0;
}
}
}