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25 package org.jrobin.graph;
26
27 import org.jrobin.core.Util;
28
29 import java.awt.*;
30
31 class ValueAxis implements RrdGraphConstants {
32 private static final YLab[] ylab = {
33 new YLab(0.1, 1, 2, 5, 10),
34 new YLab(0.2, 1, 5, 10, 20),
35 new YLab(0.5, 1, 2, 4, 10),
36 new YLab(1.0, 1, 2, 5, 10),
37 new YLab(2.0, 1, 5, 10, 20),
38 new YLab(5.0, 1, 2, 4, 10),
39 new YLab(10.0, 1, 2, 5, 10),
40 new YLab(20.0, 1, 5, 10, 20),
41 new YLab(50.0, 1, 2, 4, 10),
42 new YLab(100.0, 1, 2, 5, 10),
43 new YLab(200.0, 1, 5, 10, 20),
44 new YLab(500.0, 1, 2, 4, 10),
45 new YLab(1000.0, 1, 2, 5, 10),
46 new YLab(2000.0, 1, 5, 10, 20),
47 new YLab(5000.0, 1, 2, 4, 10),
48 new YLab(10000.0, 1, 2, 5, 10),
49 new YLab(20000.0, 1, 5, 10, 20),
50 new YLab(50000.0, 1, 2, 4, 10),
51 new YLab(100000.0, 1, 2, 5, 10),
52 new YLab(0.0, 0, 0, 0, 0)
53 };
54
55 private RrdGraph rrdGraph;
56 private ImageParameters im;
57 private ImageWorker worker;
58 private RrdGraphDef gdef;
59
60 ValueAxis(RrdGraph rrdGraph) {
61 this.rrdGraph = rrdGraph;
62 this.im = rrdGraph.im;
63 this.gdef = rrdGraph.gdef;
64 this.worker = rrdGraph.worker;
65 }
66
67 boolean draw() {
68 Font font = gdef.smallFont;
69 Paint gridColor = gdef.colors[COLOR_GRID];
70 Paint mGridColor = gdef.colors[COLOR_MGRID];
71 Paint fontColor = gdef.colors[COLOR_FONT];
72 int fontHeight = (int) Math.ceil(rrdGraph.getSmallFontHeight());
73 int labelOffset = (int) (worker.getFontAscent(font) / 2);
74 int labfact = 2, gridind = -1;
75 double range = im.maxval - im.minval;
76 double scaledrange = range / im.magfact;
77 double gridstep;
78 if (Double.isNaN(scaledrange)) {
79 return false;
80 }
81 int pixel = 1;
82 String labfmt = null;
83 if (Double.isNaN(im.ygridstep)) {
84 if (gdef.altYGrid) {
85
86 int decimals = (int) Math.ceil(Math.log10(Math.max(Math.abs(im.maxval),
87 Math.abs(im.minval))));
88 if (decimals <= 0)
89 decimals = 1;
90 }
91 int fractionals = (int) Math.floor(Math.log10(range));
92 if (fractionals < 0)
93 labfmt = Util.sprintf("%%%d.%df", decimals - fractionals + 1, -fractionals + 1);
94 }
95 else {
96 labfmt = Util.sprintf("%%%d.1f", decimals + 1);
97 }
98 gridstep = Math.pow(10, fractionals);
99 if (gridstep == 0)
100 gridstep = 0.1;
101 }
102
103 if (range / gridstep < 5) {
104 gridstep /= 10;
105 }
106 if (range / gridstep > 15) {
107 gridstep *= 10;
108 }
109 if (range / gridstep > 5) {
110 labfact = 1;
111 if (range / gridstep > 8) {
112 labfact = 2;
113 }
114 }
115 else {
116 gridstep /= 5;
117 labfact = 5;
118 }
119 }
120 else {
121 for (int i = 0; ylab[i].grid > 0; i++) {
122 pixel = (int) (im.ysize / (scaledrange / ylab[i].grid));
123 if (gridind == -1 && pixel > 5) {
124 gridind = i;
125 break;
126 }
127 }
128 for (int i = 0; i < 4; i++) {
129 if (pixel * ylab[gridind].lfac[i] >= 2 * fontHeight) {
130 labfact = ylab[gridind].lfac[i];
131 break;
132 }
133 }
134 gridstep = ylab[gridind].grid * im.magfact;
135 }
136 }
137 else {
138 gridstep = im.ygridstep;
139 labfact = im.ylabfact;
140 }
141 int x0 = im.xorigin, x1 = x0 + im.xsize;
142 int sgrid = (int) (im.minval / gridstep - 1);
143 int egrid = (int) (im.maxval / gridstep + 1);
144 double scaledstep = gridstep / im.magfact;
145 for (int i = sgrid; i <= egrid; i++) {
146 int y = rrdGraph.mapper.ytr(gridstep * i);
147 if (y >= im.yorigin - im.ysize && y <= im.yorigin) {
148 if (i % labfact == 0) {
149 String graph_label;
150 if (i == 0 || im.symbol == ' ') {
151 if (scaledstep < 1) {
152 if (i != 0 && gdef.altYGrid) {
153 graph_label = Util.sprintf(labfmt, scaledstep * i);
154 }
155 else {
156 graph_label = Util.sprintf("%4.1f", scaledstep * i);
157 }
158 }
159 else {
160 graph_label = Util.sprintf("%4.0f", scaledstep * i);
161 }
162 }
163 else {
164 if (scaledstep < 1) {
165 graph_label = Util.sprintf("%4.1f %c", scaledstep * i, im.symbol);
166 }
167 else {
168 graph_label = Util.sprintf("%4.0f %c", scaledstep * i, im.symbol);
169 }
170 }
171 int length = (int) (worker.getStringWidth(graph_label, font));
172 worker.drawString(graph_label, x0 - length - PADDING_VLABEL, y + labelOffset, font, fontColor);
173 worker.drawLine(x0 - 2, y, x0 + 2, y, mGridColor, TICK_STROKE);
174 worker.drawLine(x1 - 2, y, x1 + 2, y, mGridColor, TICK_STROKE);
175 worker.drawLine(x0, y, x1, y, mGridColor, GRID_STROKE);
176 }
177 else if (!(gdef.noMinorGrid)) {
178 worker.drawLine(x0 - 1, y, x0 + 1, y, gridColor, TICK_STROKE);
179 worker.drawLine(x1 - 1, y, x1 + 1, y, gridColor, TICK_STROKE);
180 worker.drawLine(x0, y, x1, y, gridColor, GRID_STROKE);
181 }
182 }
183 }
184 return true;
185 }
186
187 static class YLab {
188 double grid;
189 int[] lfac;
190
191 YLab(double grid, int lfac1, int lfac2, int lfac3, int lfac4) {
192 this.grid = grid;
193 lfac = new int[] {lfac1, lfac2, lfac3, lfac4};
194 }
195 }
196 }