Mercurial > dive4elements > gnv-client

comparison gnv-artifacts/src/main/java/de/intevation/gnv/exports/ChartExportHelper.java @ 1086:f2127cd0fe31

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Centered charts in a pdf exports. gnv-artifacts/trunk@1188 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 10 Jun 2010 09:05:58 +0000
parents 0318fda0001e
children 92fce3b3d07f
comparison
equal deleted inserted replaced
1085:ec512e7992c6 1086:f2127cd0fe31
246 if (pageFormat == null) 246 if (pageFormat == null)
247 pageFormat = DEFAULT_PAGE_SIZE; 247 pageFormat = DEFAULT_PAGE_SIZE;
248 248
249 // max size of the chart 249 // max size of the chart
250 Rectangle page = PageSize.getRectangle(pageFormat); 250 Rectangle page = PageSize.getRectangle(pageFormat);
251 int pageWidth = (int) (page.getRight(marginRight) - page.getLeft(marginLeft)); 251 float pageWidth = page.getWidth();
252 int pageHeight = (int) (page.getTop(marginTop) - page.getBottom(marginBottom)); 252 float pageHeight = page.getHeight();
253 253
254 // the chart width 254 // the chart width
255 int chartWidth = (Integer) context.getContextValue("chart.width"); 255 int chartWidth = (Integer) context.getContextValue("chart.width");
256 int chartHeight = (Integer) context.getContextValue("chart.height"); 256 int chartHeight = (Integer) context.getContextValue("chart.height");
257 257
258 boolean landscape = chartWidth > chartHeight ? true : false; 258 boolean landscape = chartWidth > chartHeight ? true : false;
259 259
260 int width = 0; 260 float width = 0;
261 int height = 0; 261 float height = 0;
262 if (landscape) { 262 if (landscape) {
263 width = pageHeight; 263 width = pageHeight;
264 height = pageWidth; 264 height = pageWidth;
265 } 265 }
266 else { 266 else {
267 width = pageWidth; 267 width = pageWidth;
268 height = pageHeight; 268 height = pageHeight;
269 } 269 }
270 270
271 if (chartWidth > width) { 271 float spaceX = width - marginLeft - marginRight;
272 if (chartWidth > spaceX) {
272 log.warn("Width of the chart is too big for pdf -> resize it now."); 273 log.warn("Width of the chart is too big for pdf -> resize it now.");
273 double ratio = ((double)width) / chartWidth; 274 double ratio = ((double)spaceX) / chartWidth;
274 chartWidth *= ratio; 275 chartWidth *= ratio;
275 chartHeight *= ratio; 276 chartHeight *= ratio;
276 log.debug("Resized chart to " + chartWidth + "x" + chartHeight); 277 log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
277 } 278 }
278 279
279 if (chartHeight > height) { 280 float spaceY = height - marginTop - marginBottom;
281 if (chartHeight > spaceY) {
280 log.warn("Height of the chart is too big for pdf -> resize it now."); 282 log.warn("Height of the chart is too big for pdf -> resize it now.");
281 double ratio = ((double)height) / chartHeight; 283 double ratio = ((double)spaceY) / chartHeight;
282 chartWidth *= ratio; 284 chartWidth *= ratio;
283 chartHeight *= ratio; 285 chartHeight *= ratio;
284 log.debug("Resized chart to " + chartWidth + "x" + chartHeight); 286 log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
285 } 287 }
286 288
300 document.open(); 302 document.open();
301 303
302 PdfContentByte content = writer.getDirectContent(); 304 PdfContentByte content = writer.getDirectContent();
303 305
304 PdfTemplate template = content.createTemplate(width, height); 306 PdfTemplate template = content.createTemplate(width, height);
305 Graphics2D graphics = template.createGraphics( 307 Graphics2D graphics = template.createGraphics(width, height);
308
309 double[] origin = getCenteredAnchor(
310 marginLeft, marginRight, marginBottom, marginTop,
311 width, height,
306 chartWidth, chartHeight); 312 chartWidth, chartHeight);
313
307 Rectangle2D area = new Rectangle2D.Double( 314 Rectangle2D area = new Rectangle2D.Double(
308 0.0D, 0.0D, chartWidth, chartHeight); 315 origin[0], origin[1], chartWidth, chartHeight);
309 316
310 chart.draw(graphics, area); 317 chart.draw(graphics, area);
311 graphics.dispose(); 318 graphics.dispose();
312 content.addTemplate(template, marginLeft, marginBottom); 319 content.addTemplate(template, 0f, 0f);
313 } 320 }
314 catch (DocumentException de) { 321 catch (DocumentException de) {
315 log.error("Error while exporting chart to pdf.", de); 322 log.error("Error while exporting chart to pdf.", de);
316 } 323 }
317 finally { 324 finally {
429 } 436 }
430 finally { 437 finally {
431 document.close(); 438 document.close();
432 } 439 }
433 } 440 }
441
442
443 /**
444 * This method returns the anchor of the chart so that the chart is centered
445 * according to the given parameters.
446 *
447 * @param mLeft Left margin
448 * @param mRight Right margin
449 * @param mBottom Bottom margin
450 * @param mTop Top margin
451 * @param width The complete width of the drawing area.
452 * @param height The complete height of the drawing area.
453 * @param chartWidth The width of the chart.
454 * @param chartHeight The height of the chart.
455 *
456 * @return an array that contains the anchor for a chart with the given
457 * parameters. The first value is the x point, the second value is the y
458 * point.
459 */
460 public static double[] getCenteredAnchor(
461 double mLeft, double mRight, double mBottom, double mTop,
462 double width, double height,
463 double chartWidth, double chartHeight
464 ) {
465 if (log.isDebugEnabled()) {
466 log.debug("Calculate centered origin...");
467 log.debug("-> PDF width : " + width);
468 log.debug("-> PDF height : " + height);
469 log.debug("-> Chart width : " + chartWidth);
470 log.debug("-> Chart height : " + chartHeight);
471 log.debug("-> margin left : " + mLeft);
472 log.debug("-> margin right : " + mRight);
473 log.debug("-> margin bottom: " + mBottom);
474 log.debug("-> margin top : " + mTop);
475 }
476
477 double[] origin = new double[2];
478
479 double centerX = width / 2;
480 double centerY = height / 2;
481
482 origin[0] = centerX - chartWidth / 2;
483 origin[1] = centerY - chartHeight / 2;
484
485 origin[0] = origin[0] >= mLeft ? origin[0] : mLeft;
486 origin[1] = origin[1] >= mTop ? origin[1] : mTop;
487
488 if (log.isDebugEnabled()) {
489 log.debug("==> centered left origin: " + origin[0]);
490 log.debug("==> centered top origin: " + origin[1]);
491 }
492
493 return origin;
494 }
434 } 495 }
435 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : 496 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
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