Source Code Cross Referenced for LineMetricsImpl.java in  » Apache-Harmony-Java-SE » org-package » org » apache » harmony » awt » gl » font » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » org package » org.apache.harmony.awt.gl.font 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:        /**
018:         * @author Ilya S. Okomin
019:         * @version $Revision$
020:         */package org.apache.harmony.awt.gl.font;
021:
022:        import java.awt.font.LineMetrics;
023:
024:        import org.apache.harmony.awt.internal.nls.Messages;
025:
026:        /**
027:         *
028:         * LineMetrics implementation class.
029:         */
030:
031:        public class LineMetricsImpl extends LineMetrics implements  Cloneable {
032:
033:            // array of baseline offsets
034:            float[] baselineOffsets;
035:
036:            // the number of characters to measure
037:            int numChars;
038:
039:            // baseline index of the font corresponding to this line metrics
040:            int baseLineIndex;
041:
042:            // underline thickness
043:            float underlineThickness;
044:
045:            // underline offset
046:            float underlineOffset;
047:
048:            // strikethrough thickness
049:            float strikethroughThickness;
050:
051:            // strikethrough offset
052:            float strikethroughOffset;
053:
054:            // External leading
055:            float leading;
056:
057:            // Height of the font ( == (ascent+descent+leading))
058:            float height;
059:
060:            // Ascent of the font
061:            float ascent;
062:
063:            // Descent of the font
064:            float descent;
065:
066:            // Width of the widest char in the font
067:            float maxCharWidth;
068:
069:            // underline thickness (in pixels)
070:            int lUnderlineThickness;
071:
072:            // underline offset (in pixels)
073:            int lUnderlineOffset;
074:
075:            // strikethrough thickness (in pixels)
076:            int lStrikethroughThickness;
077:
078:            // strikethrough offset (in pixels)
079:            int lStrikethroughOffset;
080:
081:            // External leading (in pixels)
082:            int lLeading;
083:
084:            // Height of the font ( == (ascent+descent+leading)) (in pixels)
085:            int lHeight;
086:
087:            // Ascent of the font (in pixels)
088:            int lAscent;
089:
090:            // Descent of the font (in pixels)
091:            int lDescent;
092:
093:            //  Width of the widest char in the font (in pixels)
094:            int lMaxCharWidth;
095:
096:            // units per EM square in font value
097:            int units_per_EM = 0;
098:
099:            /**
100:             * Creates LineMetricsImpl object from specified parameters. If baseline data parameter
101:             * is null than {0, (-ascent+descent)/2, -ascent} values are used for baseline offsets.
102:             *  
103:             * @param len a number of characters 
104:             * @param metrics an array of 16 elements with metrics values that can be 
105:             * initialized in native code.<p>
106:             * metrics[0] - ascent<p>
107:             * metrics[1] - descent<p>
108:             * metrics[2] - external leading<p>
109:             * metrics[3] - underline thickness<p>
110:             * -metrics[4] - underline offset<p>
111:             * metrics[5] - strikethrough thickness<p>
112:             * -metrics[6] - strikethrough offset<p>
113:             * metrics[7] - maximum char width<p>
114:             * metrics[8] - ascent in pixels<p>
115:             * metrics[9] - descent in pixles<p>
116:             * metrics[10] - external leading in pixels<p>
117:             * metrics[11] - underline thickness in pixels<p>
118:             * -metrics[12] - underline offset in pixels<p>
119:             * metrics[13] - strikethrough thickness in pixels<p>
120:             * -metrics[14] - strikethrough offset in pixels<p>
121:             * metrics[15] - maximum char width in pixels<p>
122:
123:             * @param _baselineData an array of 3 elements with baseline offsets metrics<p>
124:             * _baselineData[0] - roman baseline offset<p> 
125:             * _baselineData[1] - center baseline offset<p>
126:             * _baselineData[2] - hanging baseline offset<p>
127:             */
128:            public LineMetricsImpl(int len, float[] metrics,
129:                    float[] _baselineData) {
130:                if (metrics.length < 16) {
131:                    // awt.40=Wrong number of metrics\!
132:                    throw new IllegalArgumentException(Messages
133:                            .getString("awt.40")); //$NON-NLS-1$
134:                }
135:                numChars = len;
136:
137:                ascent = metrics[0]; // Ascent of the font
138:                descent = metrics[1]; // Descent of the font
139:                leading = metrics[2]; // External leading
140:
141:                if (_baselineData == null) {
142:                    baseLineIndex = 0;
143:                    baselineOffsets = new float[] { 0, (-ascent + descent) / 2,
144:                            -ascent };
145:                } else {
146:                    baseLineIndex = (int) _baselineData[3];
147:                    baselineOffsets = new float[3];
148:                    System.arraycopy(_baselineData, 0, baselineOffsets, 0, 3);
149:                }
150:
151:                height = metrics[0] + metrics[1] + metrics[2]; // Height of the font ( == (ascent + descent + leading))
152:                underlineThickness = metrics[3];
153:                underlineOffset = -metrics[4];
154:                strikethroughThickness = metrics[5];
155:                strikethroughOffset = -metrics[6];
156:                maxCharWidth = metrics[7];
157:
158:                lAscent = (int) metrics[8]; // Ascent of the font
159:                lDescent = (int) metrics[9]; // Descent of the font
160:                lLeading = (int) metrics[10]; // External leading
161:                lHeight = lAscent + lDescent + lLeading; // Height of the font ( == (ascent + descent + leading))
162:                lUnderlineThickness = (int) metrics[11];
163:                lUnderlineOffset = -(int) metrics[12];
164:                lStrikethroughThickness = (int) metrics[13];
165:                lStrikethroughOffset = -(int) metrics[14];
166:                lMaxCharWidth = (int) metrics[15];
167:
168:            }
169:
170:            /**
171:             * Creates LineMetricsImpl object from specified parameters. If baseline data parameter
172:             * is null than {0, (-ascent+descent)/2, -ascent} values are used for baseline offsets.
173:             *  
174:             * @param _numChars number of chars 
175:             * @param _baseLineIndex index of the baseline offset
176:             * @param _baselineOffsets an array of baseline offsets
177:             * @param _underlineThickness underline thickness
178:             * @param _underlineOffset underline offset
179:             * @param _strikethroughThickness strikethrough thickness
180:             * @param _strikethroughOffset strinkethrough offset
181:             * @param _leading leading of the font
182:             * @param _height font height
183:             * @param _ascent ascent of the font
184:             * @param _descent descent of the font
185:             * @param _maxCharWidth max char width
186:             */
187:            public LineMetricsImpl(int _numChars, int _baseLineIndex,
188:                    float[] _baselineOffsets, float _underlineThickness,
189:                    float _underlineOffset, float _strikethroughThickness,
190:                    float _strikethroughOffset, float _leading, float _height,
191:                    float _ascent, float _descent, float _maxCharWidth) {
192:
193:                numChars = _numChars;
194:                baseLineIndex = _baseLineIndex;
195:                underlineThickness = _underlineThickness;
196:                underlineOffset = _underlineOffset;
197:                strikethroughThickness = _strikethroughThickness;
198:                strikethroughOffset = _strikethroughOffset;
199:                leading = _leading;
200:                height = _height;
201:                ascent = _ascent;
202:                descent = _descent;
203:                baselineOffsets = _baselineOffsets;
204:                lUnderlineThickness = (int) underlineThickness;
205:                lUnderlineOffset = (int) underlineOffset;
206:                lStrikethroughThickness = (int) strikethroughThickness;
207:                lStrikethroughOffset = (int) strikethroughOffset;
208:                lLeading = (int) leading;
209:                lHeight = (int) height;
210:                lAscent = (int) ascent;
211:                lDescent = (int) descent;
212:                maxCharWidth = _maxCharWidth;
213:            }
214:
215:            public LineMetricsImpl() {
216:
217:            }
218:
219:            /**
220:             * All metrics are scaled according to scaleX and scaleY values. 
221:             * This function helps to recompute metrics according to the scale factors
222:             * of desired AffineTransform.
223:             * 
224:             * @param scaleX scale X factor
225:             * @param scaleY scale Y factor
226:             */
227:            public void scale(float scaleX, float scaleY) {
228:                float absScaleX = Math.abs(scaleX);
229:                float absScaleY = Math.abs(scaleY);
230:
231:                underlineThickness *= absScaleY;
232:                underlineOffset *= scaleY;
233:                strikethroughThickness *= absScaleY;
234:                strikethroughOffset *= scaleY;
235:                leading *= absScaleY;
236:                height *= absScaleY;
237:                ascent *= absScaleY;
238:                descent *= absScaleY;
239:
240:                if (baselineOffsets == null) {
241:                    getBaselineOffsets();
242:                }
243:
244:                for (int i = 0; i < baselineOffsets.length; i++) {
245:                    baselineOffsets[i] *= scaleY;
246:                }
247:
248:                lUnderlineThickness *= absScaleY;
249:                lUnderlineOffset *= scaleY;
250:                lStrikethroughThickness *= absScaleY;
251:                lStrikethroughOffset *= scaleY;
252:                lLeading *= absScaleY;
253:                lHeight *= absScaleY;
254:                lAscent *= absScaleY;
255:                lDescent *= absScaleY;
256:                maxCharWidth *= absScaleX;
257:
258:            }
259:
260:            /**
261:             * Returns offset of the baseline.
262:             */
263:            @Override
264:            public float[] getBaselineOffsets() {
265:                // XXX: at the moment there only horizontal metrics are taken into
266:                // account. If there is no baseline information in TrueType font
267:                // file default values used: {0, -ascent, (-ascent+descent)/2}
268:
269:                return baselineOffsets;
270:            }
271:
272:            /**
273:             * Returns a number of chars in specified text
274:             */
275:            @Override
276:            public int getNumChars() {
277:                return numChars;
278:            }
279:
280:            /**
281:             * Returns index of the baseline, one of predefined constants.
282:             */
283:            @Override
284:            public int getBaselineIndex() {
285:                // Baseline index is the deafult baseline index value
286:                // taken from the TrueType table "BASE".
287:                return baseLineIndex;
288:            }
289:
290:            /**
291:             * Returns thickness of the Underline.
292:             */
293:            @Override
294:            public float getUnderlineThickness() {
295:                return underlineThickness;
296:            }
297:
298:            /**
299:             * Returns offset of the Underline.
300:             */
301:            @Override
302:            public float getUnderlineOffset() {
303:                return underlineOffset;
304:            }
305:
306:            /**
307:             * Returns thickness of the Strikethrough line.
308:             */
309:            @Override
310:            public float getStrikethroughThickness() {
311:                return strikethroughThickness;
312:            }
313:
314:            /**
315:             * Returns offset of the Strikethrough line.
316:             */
317:            @Override
318:            public float getStrikethroughOffset() {
319:                return strikethroughOffset;
320:            }
321:
322:            /**
323:             * Returns the leading.
324:             */
325:            @Override
326:            public float getLeading() {
327:                return leading;
328:            }
329:
330:            /**
331:             * Returns the height of the font.
332:             */
333:            @Override
334:            public float getHeight() {
335:                return height; // equals to (ascent + descent + leading);
336:            }
337:
338:            /**
339:             * Returns the descent.
340:             */
341:            @Override
342:            public float getDescent() {
343:                return descent;
344:            }
345:
346:            /**
347:             * Returns the ascent.
348:             */
349:            @Override
350:            public float getAscent() {
351:                return ascent;
352:            }
353:
354:            /**
355:             * Returns logical thickness of the Underline.
356:             */
357:            public int getLogicalUnderlineThickness() {
358:                return lUnderlineThickness;
359:            }
360:
361:            /**
362:             * Returns logical offset of the Underline.
363:             */
364:            public int getLogicalUnderlineOffset() {
365:                return lUnderlineOffset;
366:            }
367:
368:            /**
369:             * Returns logical thickness of the Strikethrough line.
370:             */
371:            public int getLogicalStrikethroughThickness() {
372:                return lStrikethroughThickness;
373:            }
374:
375:            /**
376:             * Returns logical offset of the Strikethrough line.
377:             */
378:            public int getLogicalStrikethroughOffset() {
379:                return lStrikethroughOffset;
380:            }
381:
382:            /**
383:             * Returns the logical leading.
384:             */
385:            public int getLogicalLeading() {
386:                return lLeading;
387:            }
388:
389:            /**
390:             * Returns the logical height of the font.
391:             */
392:            public int getLogicalHeight() {
393:                return lHeight; // equals to (ascent + descent + leading);
394:            }
395:
396:            /**
397:             * Returns the logical descent.
398:             */
399:            public int getLogicalDescent() {
400:                return lDescent;
401:            }
402:
403:            /**
404:             * Returns the logical ascent.
405:             */
406:            public int getLogicalAscent() {
407:                return lAscent;
408:            }
409:
410:            /**
411:             * Returns the logical size of the widest char.
412:             */
413:            public int getLogicalMaxCharWidth() {
414:                return lMaxCharWidth;
415:            }
416:
417:            /**
418:             * Returns the size of the widest char.
419:             */
420:            public float getMaxCharWidth() {
421:                return maxCharWidth;
422:            }
423:
424:            /**
425:             * Set num chars to the desired value.
426:             * 
427:             * @param num specified number of chars
428:             */
429:            public void setNumChars(int num) {
430:                numChars = num;
431:            }
432:
433:            @Override
434:            public Object clone() {
435:                try {
436:                    return super .clone();
437:                } catch (CloneNotSupportedException e) {
438:                    return null;
439:                }
440:            }
441:
442:        }
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