Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/jfree/JFreeUtil.java @ 4837:9e25c7523485
Fixed calculation of effective width in MINFO SQ relation.
* Get all (including empty datasets) from db.
* Filter empty datasets when processing data of the same date.
* Added debug outputs.
author | Raimund Renkert <rrenkert@intevation.de> |
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date | Wed, 23 Jan 2013 11:14:41 +0100 |
parents | 080411ac948f |
children |
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package de.intevation.flys.jfree; import java.awt.Shape; import java.awt.geom.Rectangle2D; import java.util.Iterator; import java.util.Random; import org.apache.log4j.Logger; import org.jfree.chart.entity.ChartEntity; import org.jfree.chart.entity.EntityCollection; import org.w3c.dom.Document; import de.intevation.flys.artifacts.math.Function; public class JFreeUtil { private static final Logger logger = Logger.getLogger(JFreeUtil.class); /** Do not instantiate. */ private JFreeUtil() { } /** * True if \param hotspot collides with a Entity in \param entities. * @param hotspot Shape to compare against other shapes (bounds only). * @param entities entities against which to compare shape. * @param exclusiveEntityClass If not null, consider only entities of * given class. * @return true if a collision (non-zero intersection) exists between * shapes. */ public static boolean collides(Shape hotspot, EntityCollection entities, Class exclusiveEntityClass) { if (entities == null) return false; Rectangle2D hotspotBox = hotspot.getBounds2D(); for (Iterator i = entities.iterator(); i.hasNext(); ) { Object next = i.next(); ChartEntity entity = (ChartEntity) next; if (exclusiveEntityClass == null || exclusiveEntityClass.isInstance(entity)) { if (entity.getArea().intersects(hotspotBox)) { // Found collision, early stop. return true; } } } return false; } /** * This function samples a randomized line that contains of x and y values * between <i>startX</i>, <i>endX</i>, <i>startY</i> and <i>endY</i>. The * number of points in the line is specified by <i>num</i>. * * @param num The number of points in the line. * @param startX The min value of the x values. * @param endX The max value of the x values. * @param startY The min value of the y values. * @param endY The max value of the y values. * @return an array with [allX-values, allY-values]. * @throws IllegalArgumentException */ public static double[][] randomizeLine( int num, double startX, double endX, double startY, double endY ) throws IllegalArgumentException { if (num <= 0) { throw new IllegalArgumentException("Parameter 'num' has to be > 0"); } Random random = new Random(); double[] x = new double[num]; double[] y = new double[num]; for (int i = 0; i < num; i++) { double xFac = random.nextDouble(); double yFac = random.nextDouble(); x[i] = startX + xFac * (endX - startX); y[i] = startY + yFac * (endY - startY); logger.debug("Created new point: " + x[i] + "|" + y[i]); } return new double[][] { x, y }; } public static StyledXYSeries sampleFunction2D( Function func, Document theme, String seriesKey, int samples, double start, double end ) { StyledXYSeries series = new StyledXYSeries(seriesKey, theme); double step = (end - start) / (samples - 1); for (int i = 0; i < samples; i++) { double x = start + (step * i); series.add(x, func.value(x)); } return series; } public static StyledXYSeries sampleFunction2DPositive( Function func, Document theme, String seriesKey, int samples, double start, double end ) { StyledXYSeries series = new StyledXYSeries(seriesKey, theme); double step = (end - start) / (samples - 1); for (int i = 0; i < samples; i++) { double x = start + (step * i); double v = func.value(x); if (x > 0d && v > 0d) { series.add(x, v); } } return series; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :