1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25 package org.jrobin.graph;
26
27 import org.jrobin.core.Util;
28
29 import java.awt.*;
30
31 class ValueAxisLogarithmic implements RrdGraphConstants {
32 private static final double[][] yloglab = {
33 {1e9, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
34 {1e3, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
35 {1e1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
36
37 {1e1, 1, 2.5, 5, 7.5, 0, 0, 0, 0, 0, 0, 0},
38 {1e1, 1, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0},
39 {1e1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0},
40 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
41 };
42
43 private RrdGraph rrdGraph;
44 private ImageParameters im;
45 private ImageWorker worker;
46 private RrdGraphDef gdef;
47
48 ValueAxisLogarithmic(RrdGraph rrdGraph) {
49 this.rrdGraph = rrdGraph;
50 this.im = rrdGraph.im;
51 this.gdef = rrdGraph.gdef;
52 this.worker = rrdGraph.worker;
53 }
54
55 boolean draw() {
56 Font font = gdef.smallFont;
57 Paint gridColor = gdef.colors[COLOR_GRID];
58 Paint mGridColor = gdef.colors[COLOR_MGRID];
59 Paint fontColor = gdef.colors[COLOR_FONT];
60 int fontHeight = (int) Math.ceil(rrdGraph.getSmallFontHeight());
61 int labelOffset = (int) (worker.getFontAscent(font) / 2);
62
63 double pixpex = (double) im.ysize / (Math.log10(im.maxval) - Math.log10(im.minval));
64 if (Double.isNaN(pixpex)) {
65 return false;
66 }
67 double minstep, pixperstep;
68 int minoridx = 0, majoridx = 0;
69 for (int i = 0; yloglab[i][0] > 0; i++) {
70 minstep = Math.log10(yloglab[i][0]);
71 for (int ii = 1; yloglab[i][ii + 1] > 0; ii++) {
72 if (yloglab[i][ii + 2] == 0) {
73 minstep = Math.log10(yloglab[i][ii + 1]) - Math.log10(yloglab[i][ii]);
74 break;
75 }
76 }
77 pixperstep = pixpex * minstep;
78 if (pixperstep > 5) {
79 minoridx = i;
80 }
81 if (pixperstep > 2 * fontHeight) {
82 majoridx = i;
83 }
84 }
85 int x0 = im.xorigin, x1 = x0 + im.xsize;
86 for (double value = Math.pow(10, Math.log10(im.minval)
87 - Math.log10(im.minval) % Math.log10(yloglab[minoridx][0]));
88 value <= im.maxval;
89 value *= yloglab[minoridx][0]) {
90 if (value < im.minval) {
91 continue;
92 }
93 int i = 0;
94 while (yloglab[minoridx][++i] > 0) {
95 int y = rrdGraph.mapper.ytr(value * yloglab[minoridx][i]);
96 if (y <= im.yorigin - im.ysize) {
97 break;
98 }
99 worker.drawLine(x0 - 1, y, x0 + 1, y, gridColor, TICK_STROKE);
100 worker.drawLine(x1 - 1, y, x1 + 1, y, gridColor, TICK_STROKE);
101 worker.drawLine(x0, y, x1, y, gridColor, GRID_STROKE);
102 }
103 }
104 for (double value = Math.pow(10, Math.log10(im.minval)
105 - (Math.log10(im.minval) % Math.log10(yloglab[majoridx][0])));
106 value <= im.maxval;
107 value *= yloglab[majoridx][0]) {
108 if (value < im.minval) {
109 continue;
110 }
111 int i = 0;
112 while (yloglab[majoridx][++i] > 0) {
113 int y = rrdGraph.mapper.ytr(value * yloglab[majoridx][i]);
114 if (y <= im.yorigin - im.ysize) {
115 break;
116 }
117 worker.drawLine(x0 - 2, y, x0 + 2, y, mGridColor, TICK_STROKE);
118 worker.drawLine(x1 - 2, y, x1 + 2, y, mGridColor, TICK_STROKE);
119 worker.drawLine(x0, y, x1, y, mGridColor, GRID_STROKE);
120 String graph_label = Util.sprintf("%3.0e", value * yloglab[majoridx][i]);
121 int length = (int) (worker.getStringWidth(graph_label, font));
122 worker.drawString(graph_label, x0 - length - PADDING_VLABEL, y + labelOffset, font, fontColor);
123 }
124 }
125 return true;
126 }
127 }