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41 import java.applet.Applet  ;
42 import java.awt.Image ;
43 import java.awt.Graphics ;
44 import java.awt.Rectangle ;
45 import java.util.StringTokenizer ;
46 import java.util.Vector ;
47 import java.util.Hashtable ;
48 import java.net.URL ;
49 import java.awt.image.*;
50 import java.net.MalformedURLException ;
51
52
60 class ButtonFilter extends RGBImageFilter {
61 boolean pressed;
62 int defpercent;
63 int border;
64 int width;
65 int height;
66
67 ColorModel models[] = new ColorModel[7];
68 ColorModel origbuttonmodel;
69
70 public ButtonFilter(boolean press, int p, int b, int w, int h) {
71 pressed = press;
72 defpercent = p;
73 border = b;
74 width = w;
75 height = h;
76 }
77
78 public void setHints(int hints) {
79 super.setHints(hints & (~ImageConsumer.COMPLETESCANLINES));
80 }
81
82 public void setColorModel(ColorModel model) {
83 if (model instanceof IndexColorModel && true) {
84 IndexColorModel icm = (IndexColorModel) model;
85 models[0] = filterIndexColorModel(icm, false, false, 0);
86 models[1] = filterIndexColorModel(icm, true, !pressed, defpercent);
87 models[2] = null;
88 if (pressed) {
89 models[3] = filterIndexColorModel(icm, true, false,
90 defpercent/2);
91 } else {
92 models[3] = models[0];
93 }
94 models[4] = null;
95 models[5] = filterIndexColorModel(icm, true, pressed, defpercent);
96 models[6] = models[0];
97 origbuttonmodel = model;
98 consumer.setColorModel(models[3]);
99 } else {
100 super.setColorModel(model);
101 }
102 }
103
104 public IndexColorModel filterIndexColorModel(IndexColorModel icm,
105 boolean opaque,
106 boolean brighter,
107 int percent) {
108 byte r[] = new byte[256];
109 byte g[] = new byte[256];
110 byte b[] = new byte[256];
111 byte a[] = new byte[256];
112 int mapsize = icm.getMapSize();
113 icm.getReds(r);
114 icm.getGreens(g);
115 icm.getBlues(b);
116 if (opaque) {
117 icm.getAlphas(a);
118 for (int i = 0; i < mapsize; i++) {
119 int rgb = filterRGB(icm.getRGB(i), brighter, percent);
120 a[i] = (byte) (rgb >> 24);
121 r[i] = (byte) (rgb >> 16);
122 g[i] = (byte) (rgb >> 8);
123 b[i] = (byte) (rgb >> 0);
124 }
125 }
126 return new IndexColorModel(icm.getPixelSize(), mapsize, r, g, b, a);
127 }
128
129
152 public void buttonRanges(int y, int ranges[]) {
153 ranges[0] = ranges[1] = 0;
154 if (y < border) {
155 ranges[2] = ranges[3] = ranges[4] = ranges[5] = width - y;
156 ranges[8] = ranges[9] = y;
157 } else if (y > height - border) {
158 ranges[2] = ranges[3] = ranges[4] = ranges[5] = height - y;
159 ranges[8] = ranges[9] = y;
160 } else {
161 ranges[2] = ranges[3] = border;
162 ranges[4] = ranges[5] = width - border;
163 ranges[8] = border;
164 ranges[9] = height - border;
165 }
166 ranges[6] = ranges[7] = width;
167 }
168
169 private int savedranges[];
170
171 protected int[] getRanges(int y) {
172 int ranges[] = savedranges;
173 if (ranges == null) {
174 ranges = savedranges = new int[10];
175 ranges[8] = ranges[9] = -1;
176 }
177 if (y < ranges[8] || y > ranges[9]) {
178 buttonRanges(y, ranges);
179 }
180 return ranges;
181 }
182
183 public void setPixels(int x, int y, int w, int h,
184 ColorModel model, byte pixels[], int off,
185 int scansize) {
186 if (model == origbuttonmodel) {
187 int ranges[] = getRanges(y);
188 int x2 = x + w;
189 int y2 = y + h;
190 for (int cy = y; cy < y2; cy++) {
191 if (cy < ranges[8] || cy > ranges[9]) {
192 buttonRanges(cy, ranges);
193 }
194 for (int i = 0; i < 7; i++) {
195 if (x2 > ranges[i] && x < ranges[i+1]) {
196 int cx1 = Math.max(x, ranges[i]);
197 int cx2 = Math.min(x2, ranges[i+1]);
198 if (models[i] == null) {
199 super.setPixels(cx1, cy, cx2 - cx1, 1,
200 model, pixels,
201 off + (cx1 - x), scansize);
202 } else {
203 if (cx1 < cx2) {
204 consumer.setPixels(cx1, cy, cx2 - cx1, 1,
205 models[i], pixels,
206 off + (cx1 - x), scansize);
207 }
208 }
209 }
210 }
211 off += scansize;
212 }
213 } else {
214 super.setPixels(x, y, w, h, model, pixels, off, scansize);
215 }
216 }
217
218 public int filterRGB(int x, int y, int rgb) {
219 boolean brighter;
220 int percent;
221 if ((x < border && y < height - x) || (y < border && x < width - y)) {
222 brighter = !pressed;
223 percent = defpercent;
224 } else if (x >= width - border || y >= height - border) {
225 brighter = pressed;
226 percent = defpercent;
227 } else if (pressed) {
228 brighter = false;
229 percent = defpercent / 2;
230 } else {
231 return rgb & 0x00ffffff;
232 }
233 return filterRGB(rgb, brighter, percent);
234 }
235
236 public int filterRGB(int rgb, boolean brighter, int percent) {
237 int r = (rgb >> 16) & 0xff;
238 int g = (rgb >> 8) & 0xff;
239 int b = (rgb >> 0) & 0xff;
240 if (brighter) {
241 r = (255 - ((255 - r) * (100 - percent) / 100));
242 g = (255 - ((255 - g) * (100 - percent) / 100));
243 b = (255 - ((255 - b) * (100 - percent) / 100));
244 } else {
245 r = (r * (100 - percent) / 100);
246 g = (g * (100 - percent) / 100);
247 b = (b * (100 - percent) / 100);
248 }
249 return (rgb & 0xff000000) | (r << 16) | (g << 8) | (b << 0);
250 }
251
252 public String getAppletInfo() {
253 return "Title: ButtonFilter \nAuthor: Jim Graham \nAn extensible ImageMap applet class. The active areas on the image are controlled by ImageArea classes that can be dynamically loaded over the net.";
254 }
255 }
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