Source Code Cross Referenced for EscherGraphics.java in  » Collaboration » poi-3.0.2-beta2 » org » apache » poi » hssf » usermodel » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Collaboration » poi 3.0.2 beta2 » org.apache.poi.hssf.usermodel 
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:        package org.apache.poi.hssf.usermodel;
019:
020:        import org.apache.poi.hssf.util.HSSFColor;
021:        import org.apache.poi.util.POILogFactory;
022:        import org.apache.poi.util.POILogger;
023:
024:        import java.awt.*;
025:        import java.awt.image.ImageObserver;
026:        import java.text.AttributedCharacterIterator;
027:
028:        /**
029:         * Translates Graphics calls into escher calls.  The translation is lossy so
030:         * many features are not supported and some just aren't implemented yet.  If
031:         * in doubt test the specific calls you wish to make. Graphics calls are
032:         * always performed into an EscherGroup so one will need to be created.
033:         * <p>
034:         * <b>Important:</b>
035:         * <blockquote>
036:         * One important concept worth considering is that of font size.  One of the
037:         * difficulties in converting Graphics calls into escher drawing calls is that
038:         * Excel does not have the concept of absolute pixel positions.  It measures
039:         * it's cell widths in 'characters' and the cell heights in points.
040:         * Unfortunately it's not defined exactly what a type of character it's
041:         * measuring.  Presumably this is due to the fact that the Excel will be
042:         * using different fonts on different platforms or even within the same
043:         * platform.
044:         * <p>
045:         * Because of this constraint we've had to calculate the
046:         * verticalPointsPerPixel.  This the amount the font should be scaled by when
047:         * you issue commands such as drawString().  A good way to calculate this
048:         * is to use the follow formula:
049:         * <p>
050:         * <pre>
051:         *      multipler = groupHeightInPoints / heightOfGroup
052:         * </pre>
053:         * <p>
054:         * The height of the group is calculated fairly simply by calculating the
055:         * difference between the y coordinates of the bounding box of the shape.  The
056:         * height of the group can be calculated by using a convenience called
057:         * <code>HSSFClientAnchor.getAnchorHeightInPoints()</code>.
058:         * </blockquote>
059:         *
060:         * @author Glen Stampoultzis (glens at apache.org)
061:         */
062:        public class EscherGraphics extends Graphics {
063:            private HSSFShapeGroup escherGroup;
064:            private HSSFWorkbook workbook;
065:            private float verticalPointsPerPixel = 1.0f;
066:            private float verticalPixelsPerPoint;
067:            private Color foreground;
068:            private Color background = Color.white;
069:            private Font font;
070:            private static POILogger logger = POILogFactory
071:                    .getLogger(EscherGraphics.class);
072:
073:            /**
074:             * Construct an escher graphics object.
075:             *
076:             * @param escherGroup           The escher group to write the graphics calls into.
077:             * @param workbook              The workbook we are using.
078:             * @param forecolor             The foreground color to use as default.
079:             * @param verticalPointsPerPixel    The font multiplier.  (See class description for information on how this works.).
080:             */
081:            public EscherGraphics(HSSFShapeGroup escherGroup,
082:                    HSSFWorkbook workbook, Color forecolor,
083:                    float verticalPointsPerPixel) {
084:                this .escherGroup = escherGroup;
085:                this .workbook = workbook;
086:                this .verticalPointsPerPixel = verticalPointsPerPixel;
087:                this .verticalPixelsPerPoint = 1 / verticalPointsPerPixel;
088:                this .font = new Font("Arial", 0, 10);
089:                this .foreground = forecolor;
090:                //        background = backcolor;
091:            }
092:
093:            /**
094:             * Constructs an escher graphics object.
095:             *
096:             * @param escherGroup           The escher group to write the graphics calls into.
097:             * @param workbook              The workbook we are using.
098:             * @param foreground            The foreground color to use as default.
099:             * @param verticalPointsPerPixel    The font multiplier.  (See class description for information on how this works.).
100:             * @param font                  The font to use.
101:             */
102:            EscherGraphics(HSSFShapeGroup escherGroup, HSSFWorkbook workbook,
103:                    Color foreground, Font font, float verticalPointsPerPixel) {
104:                this .escherGroup = escherGroup;
105:                this .workbook = workbook;
106:                this .foreground = foreground;
107:                //        this.background = background;
108:                this .font = font;
109:                this .verticalPointsPerPixel = verticalPointsPerPixel;
110:                this .verticalPixelsPerPoint = 1 / verticalPointsPerPixel;
111:            }
112:
113:            //    /**
114:            //     * Constructs an escher graphics object.
115:            //     *
116:            //     * @param escherGroup           The escher group to write the graphics calls into.
117:            //     * @param workbook              The workbook we are using.
118:            //     * @param forecolor             The default foreground color.
119:            //     */
120:            //    public EscherGraphics( HSSFShapeGroup escherGroup, HSSFWorkbook workbook, Color forecolor)
121:            //    {
122:            //        this(escherGroup, workbook, forecolor, 1.0f);
123:            //    }
124:
125:            public void clearRect(int x, int y, int width, int height) {
126:                Color color = foreground;
127:                setColor(background);
128:                fillRect(x, y, width, height);
129:                setColor(color);
130:            }
131:
132:            public void clipRect(int x, int y, int width, int height) {
133:                if (logger.check(POILogger.WARN))
134:                    logger.log(POILogger.WARN, "clipRect not supported");
135:            }
136:
137:            public void copyArea(int x, int y, int width, int height, int dx,
138:                    int dy) {
139:                if (logger.check(POILogger.WARN))
140:                    logger.log(POILogger.WARN, "copyArea not supported");
141:            }
142:
143:            public Graphics create() {
144:                EscherGraphics g = new EscherGraphics(escherGroup, workbook,
145:                        foreground, font, verticalPointsPerPixel);
146:                return g;
147:            }
148:
149:            public void dispose() {
150:            }
151:
152:            public void drawArc(int x, int y, int width, int height,
153:                    int startAngle, int arcAngle) {
154:                if (logger.check(POILogger.WARN))
155:                    logger.log(POILogger.WARN, "drawArc not supported");
156:            }
157:
158:            public boolean drawImage(Image img, int dx1, int dy1, int dx2,
159:                    int dy2, int sx1, int sy1, int sx2, int sy2, Color bgcolor,
160:                    ImageObserver observer) {
161:                if (logger.check(POILogger.WARN))
162:                    logger.log(POILogger.WARN, "drawImage not supported");
163:
164:                return true;
165:            }
166:
167:            public boolean drawImage(Image img, int dx1, int dy1, int dx2,
168:                    int dy2, int sx1, int sy1, int sx2, int sy2,
169:                    ImageObserver observer) {
170:                if (logger.check(POILogger.WARN))
171:                    logger.log(POILogger.WARN, "drawImage not supported");
172:                return true;
173:            }
174:
175:            public boolean drawImage(Image image, int i, int j, int k, int l,
176:                    Color color, ImageObserver imageobserver) {
177:                return drawImage(image, i, j, i + k, j + l, 0, 0, image
178:                        .getWidth(imageobserver), image
179:                        .getHeight(imageobserver), color, imageobserver);
180:            }
181:
182:            public boolean drawImage(Image image, int i, int j, int k, int l,
183:                    ImageObserver imageobserver) {
184:                return drawImage(image, i, j, i + k, j + l, 0, 0, image
185:                        .getWidth(imageobserver), image
186:                        .getHeight(imageobserver), imageobserver);
187:            }
188:
189:            public boolean drawImage(Image image, int i, int j, Color color,
190:                    ImageObserver imageobserver) {
191:                return drawImage(image, i, j, image.getWidth(imageobserver),
192:                        image.getHeight(imageobserver), color, imageobserver);
193:            }
194:
195:            public boolean drawImage(Image image, int i, int j,
196:                    ImageObserver imageobserver) {
197:                return drawImage(image, i, j, image.getWidth(imageobserver),
198:                        image.getHeight(imageobserver), imageobserver);
199:            }
200:
201:            public void drawLine(int x1, int y1, int x2, int y2) {
202:                drawLine(x1, y1, x2, y2, 0);
203:            }
204:
205:            public void drawLine(int x1, int y1, int x2, int y2, int width) {
206:                HSSFSimpleShape shape = escherGroup
207:                        .createShape(new HSSFChildAnchor(x1, y1, x2, y2));
208:                shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);
209:                shape.setLineWidth(width);
210:                shape.setLineStyleColor(foreground.getRed(), foreground
211:                        .getGreen(), foreground.getBlue());
212:            }
213:
214:            public void drawOval(int x, int y, int width, int height) {
215:                HSSFSimpleShape shape = escherGroup
216:                        .createShape(new HSSFChildAnchor(x, y, x + width, y
217:                                + height));
218:                shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_OVAL);
219:                shape.setLineWidth(0);
220:                shape.setLineStyleColor(foreground.getRed(), foreground
221:                        .getGreen(), foreground.getBlue());
222:                shape.setNoFill(true);
223:            }
224:
225:            public void drawPolygon(int xPoints[], int yPoints[], int nPoints) {
226:                int right = findBiggest(xPoints);
227:                int bottom = findBiggest(yPoints);
228:                int left = findSmallest(xPoints);
229:                int top = findSmallest(yPoints);
230:                HSSFPolygon shape = escherGroup
231:                        .createPolygon(new HSSFChildAnchor(left, top, right,
232:                                bottom));
233:                shape.setPolygonDrawArea(right - left, bottom - top);
234:                shape.setPoints(addToAll(xPoints, -left), addToAll(yPoints,
235:                        -top));
236:                shape.setLineStyleColor(foreground.getRed(), foreground
237:                        .getGreen(), foreground.getBlue());
238:                shape.setLineWidth(0);
239:                shape.setNoFill(true);
240:            }
241:
242:            private int[] addToAll(int[] values, int amount) {
243:                int[] result = new int[values.length];
244:                for (int i = 0; i < values.length; i++)
245:                    result[i] = values[i] + amount;
246:                return result;
247:            }
248:
249:            public void drawPolyline(int xPoints[], int yPoints[], int nPoints) {
250:                if (logger.check(POILogger.WARN))
251:                    logger.log(POILogger.WARN, "drawPolyline not supported");
252:            }
253:
254:            public void drawRect(int x, int y, int width, int height) {
255:                if (logger.check(POILogger.WARN))
256:                    logger.log(POILogger.WARN, "drawRect not supported");
257:            }
258:
259:            public void drawRoundRect(int x, int y, int width, int height,
260:                    int arcWidth, int arcHeight) {
261:                if (logger.check(POILogger.WARN))
262:                    logger.log(POILogger.WARN, "drawRoundRect not supported");
263:            }
264:
265:            public void drawString(String str, int x, int y) {
266:                if (str == null || str.equals(""))
267:                    return;
268:
269:                Font excelFont = font;
270:                if (font.getName().equals("SansSerif")) {
271:                    excelFont = new Font("Arial", font.getStyle(), (int) (font
272:                            .getSize() / verticalPixelsPerPoint));
273:                } else {
274:                    excelFont = new Font(font.getName(), font.getStyle(),
275:                            (int) (font.getSize() / verticalPixelsPerPoint));
276:                }
277:                FontDetails d = StaticFontMetrics.getFontDetails(excelFont);
278:                int width = (int) ((d.getStringWidth(str) * 8) + 12);
279:                int height = (int) ((font.getSize() / verticalPixelsPerPoint) + 6) * 2;
280:                y -= (font.getSize() / verticalPixelsPerPoint) + 2
281:                        * verticalPixelsPerPoint; // we want to draw the shape from the top-left
282:                HSSFTextbox textbox = escherGroup
283:                        .createTextbox(new HSSFChildAnchor(x, y, x + width, y
284:                                + height));
285:                textbox.setNoFill(true);
286:                textbox.setLineStyle(HSSFShape.LINESTYLE_NONE);
287:                HSSFRichTextString s = new HSSFRichTextString(str);
288:                HSSFFont hssfFont = matchFont(excelFont);
289:                s.applyFont(hssfFont);
290:                textbox.setString(s);
291:            }
292:
293:            private HSSFFont matchFont(Font font) {
294:                HSSFColor hssfColor = workbook.getCustomPalette().findColor(
295:                        (byte) foreground.getRed(),
296:                        (byte) foreground.getGreen(),
297:                        (byte) foreground.getBlue());
298:                if (hssfColor == null)
299:                    hssfColor = workbook.getCustomPalette().findSimilarColor(
300:                            (byte) foreground.getRed(),
301:                            (byte) foreground.getGreen(),
302:                            (byte) foreground.getBlue());
303:                boolean bold = (font.getStyle() & Font.BOLD) != 0;
304:                boolean italic = (font.getStyle() & Font.ITALIC) != 0;
305:                HSSFFont hssfFont = workbook.findFont(
306:                        bold ? HSSFFont.BOLDWEIGHT_BOLD : 0, hssfColor
307:                                .getIndex(), (short) (font.getSize() * 20),
308:                        font.getName(), italic, false, (short) 0, (byte) 0);
309:                if (hssfFont == null) {
310:                    hssfFont = workbook.createFont();
311:                    hssfFont.setBoldweight(bold ? HSSFFont.BOLDWEIGHT_BOLD : 0);
312:                    hssfFont.setColor(hssfColor.getIndex());
313:                    hssfFont.setFontHeight((short) (font.getSize() * 20));
314:                    hssfFont.setFontName(font.getName());
315:                    hssfFont.setItalic(italic);
316:                    hssfFont.setStrikeout(false);
317:                    hssfFont.setTypeOffset((short) 0);
318:                    hssfFont.setUnderline((byte) 0);
319:                }
320:
321:                return hssfFont;
322:            }
323:
324:            public void drawString(AttributedCharacterIterator iterator, int x,
325:                    int y) {
326:                if (logger.check(POILogger.WARN))
327:                    logger.log(POILogger.WARN, "drawString not supported");
328:            }
329:
330:            public void fillArc(int x, int y, int width, int height,
331:                    int startAngle, int arcAngle) {
332:                if (logger.check(POILogger.WARN))
333:                    logger.log(POILogger.WARN, "fillArc not supported");
334:            }
335:
336:            public void fillOval(int x, int y, int width, int height) {
337:                HSSFSimpleShape shape = escherGroup
338:                        .createShape(new HSSFChildAnchor(x, y, x + width, y
339:                                + height));
340:                shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_OVAL);
341:                shape.setLineStyle(HSSFShape.LINESTYLE_NONE);
342:                shape.setFillColor(foreground.getRed(), foreground.getGreen(),
343:                        foreground.getBlue());
344:                shape.setLineStyleColor(foreground.getRed(), foreground
345:                        .getGreen(), foreground.getBlue());
346:            }
347:
348:            /**
349:             * Fills a (closed) polygon, as defined by a pair of arrays, which
350:             *  hold the <i>x</i> and <i>y</i> coordinates.
351:             * <p>
352:             * This draws the polygon, with <code>nPoint</code> line segments.
353:             * The first <code>nPoint&nbsp;-&nbsp;1</code> line segments are
354:             *  drawn between sequential points 
355:             *  (<code>xPoints[i],yPoints[i],xPoints[i+1],yPoints[i+1]</code>).
356:             * The final line segment is a closing one, from the last point to 
357:             *  the first (assuming they are different).
358:             * <p>
359:             * The area inside of the polygon is defined by using an
360:             *  even-odd fill rule (also known as the alternating rule), and 
361:             *  the area inside of it is filled.
362:             * @param xPoints array of the <code>x</code> coordinates.
363:             * @param yPoints array of the <code>y</code> coordinates.
364:             * @param nPoints the total number of points in the polygon.
365:             * @see   java.awt.Graphics#drawPolygon(int[], int[], int)
366:             */
367:            public void fillPolygon(int xPoints[], int yPoints[], int nPoints) {
368:                int right = findBiggest(xPoints);
369:                int bottom = findBiggest(yPoints);
370:                int left = findSmallest(xPoints);
371:                int top = findSmallest(yPoints);
372:                HSSFPolygon shape = escherGroup
373:                        .createPolygon(new HSSFChildAnchor(left, top, right,
374:                                bottom));
375:                shape.setPolygonDrawArea(right - left, bottom - top);
376:                shape.setPoints(addToAll(xPoints, -left), addToAll(yPoints,
377:                        -top));
378:                shape.setLineStyleColor(foreground.getRed(), foreground
379:                        .getGreen(), foreground.getBlue());
380:                shape.setFillColor(foreground.getRed(), foreground.getGreen(),
381:                        foreground.getBlue());
382:            }
383:
384:            private int findBiggest(int[] values) {
385:                int result = Integer.MIN_VALUE;
386:                for (int i = 0; i < values.length; i++) {
387:                    if (values[i] > result)
388:                        result = values[i];
389:                }
390:                return result;
391:            }
392:
393:            private int findSmallest(int[] values) {
394:                int result = Integer.MAX_VALUE;
395:                for (int i = 0; i < values.length; i++) {
396:                    if (values[i] < result)
397:                        result = values[i];
398:                }
399:                return result;
400:            }
401:
402:            public void fillRect(int x, int y, int width, int height) {
403:                HSSFSimpleShape shape = escherGroup
404:                        .createShape(new HSSFChildAnchor(x, y, x + width, y
405:                                + height));
406:                shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_RECTANGLE);
407:                shape.setLineStyle(HSSFShape.LINESTYLE_NONE);
408:                shape.setFillColor(foreground.getRed(), foreground.getGreen(),
409:                        foreground.getBlue());
410:                shape.setLineStyleColor(foreground.getRed(), foreground
411:                        .getGreen(), foreground.getBlue());
412:            }
413:
414:            public void fillRoundRect(int x, int y, int width, int height,
415:                    int arcWidth, int arcHeight) {
416:                if (logger.check(POILogger.WARN))
417:                    logger.log(POILogger.WARN, "fillRoundRect not supported");
418:            }
419:
420:            public Shape getClip() {
421:                return getClipBounds();
422:            }
423:
424:            public Rectangle getClipBounds() {
425:                return null;
426:            }
427:
428:            public Rectangle getClipRect() {
429:                return getClipBounds();
430:            }
431:
432:            public Color getColor() {
433:                return foreground;
434:            }
435:
436:            public Font getFont() {
437:                return font;
438:            }
439:
440:            public FontMetrics getFontMetrics(Font f) {
441:                return Toolkit.getDefaultToolkit().getFontMetrics(f);
442:            }
443:
444:            public void setClip(int x, int y, int width, int height) {
445:                setClip(((Shape) (new Rectangle(x, y, width, height))));
446:            }
447:
448:            public void setClip(Shape shape) {
449:                // ignore... not implemented
450:            }
451:
452:            public void setColor(Color color) {
453:                foreground = color;
454:            }
455:
456:            public void setFont(Font f) {
457:                font = f;
458:            }
459:
460:            public void setPaintMode() {
461:                if (logger.check(POILogger.WARN))
462:                    logger.log(POILogger.WARN, "setPaintMode not supported");
463:            }
464:
465:            public void setXORMode(Color color) {
466:                if (logger.check(POILogger.WARN))
467:                    logger.log(POILogger.WARN, "setXORMode not supported");
468:            }
469:
470:            public void translate(int x, int y) {
471:                if (logger.check(POILogger.WARN))
472:                    logger.log(POILogger.WARN, "translate not supported");
473:            }
474:
475:            public Color getBackground() {
476:                return background;
477:            }
478:
479:            public void setBackground(Color background) {
480:                this .background = background;
481:            }
482:
483:            HSSFShapeGroup getEscherGraphics() {
484:                return escherGroup;
485:            }
486:        }
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