Java tutorial
package de.hdm.uls.loadtests.ui; /* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jfreechart/index.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * --------------------- * MyXYAreaRenderer.java * --------------------- * (C) Copyright 2005, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: XYAreaRenderer.java,v 1.12.2.5 2005/12/22 15:53:05 mungady Exp $ * * Changes: * -------- * 22-Dec-2005 : Version 1 (DG); * * */ import java.awt.GradientPaint; import java.awt.Graphics2D; import java.awt.Paint; import java.awt.Polygon; import java.awt.Shape; import java.awt.Stroke; import java.awt.geom.Line2D; import java.awt.geom.Rectangle2D; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.entity.EntityCollection; import org.jfree.chart.entity.XYItemEntity; import org.jfree.chart.labels.XYToolTipGenerator; import org.jfree.chart.plot.CrosshairState; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.PlotRenderingInfo; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYAreaRenderer; import org.jfree.chart.renderer.xy.XYItemRendererState; import org.jfree.chart.urls.XYURLGenerator; import org.jfree.data.xy.XYDataset; import org.jfree.ui.GradientPaintTransformer; import org.jfree.ui.StandardGradientPaintTransformer; import org.jfree.util.ShapeUtilities; /** * Custom renderer. */ public class XYLineAndAreaRenderer extends XYAreaRenderer { /** * A state object used by this renderer. */ static class XYAreaRendererState extends XYItemRendererState { /** Working storage for the area under one series. */ public Polygon area; /** Working line that can be recycled. */ public Line2D line; /** * Creates a new state. * * @param info the plot rendering info. */ public XYAreaRendererState(PlotRenderingInfo info) { super(info); this.area = new Polygon(); this.line = new Line2D.Double(); } } /** * Constructs a new renderer. */ public XYLineAndAreaRenderer() { this(AREA); } /** * Constructs a new renderer. * * @param type the type of the renderer. */ public XYLineAndAreaRenderer(int type) { this(type, null, null); } /** * Constructs a new renderer. * <p> * To specify the type of renderer, use one of the constants: SHAPES, LINES, * SHAPES_AND_LINES, AREA or AREA_AND_SHAPES. * * @param type the type of renderer. * @param toolTipGenerator the tool tip generator to use * (<code>null</code> permitted). * @param urlGenerator the URL generator (<code>null</code> permitted). */ public XYLineAndAreaRenderer(int type, XYToolTipGenerator toolTipGenerator, XYURLGenerator urlGenerator) { super(type, toolTipGenerator, urlGenerator); } /** * Initialises the renderer and returns a state object that should be * passed to all subsequent calls to the drawItem() method. * * @param g2 the graphics device. * @param dataArea the area inside the axes. * @param plot the plot. * @param data the data. * @param info an optional info collection object to return data back to * the caller. * * @return A state object for use by the renderer. */ public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea, XYPlot plot, XYDataset data, PlotRenderingInfo info) { XYAreaRendererState state = new XYAreaRendererState(info); return state; } /** * Draws the visual representation of a single data item. * * @param g2 the graphics device. * @param state the renderer state. * @param dataArea the area within which the data is being drawn. * @param info collects information about the drawing. * @param plot the plot (can be used to obtain standard color information * etc). * @param domainAxis the domain axis. * @param rangeAxis the range axis. * @param dataset the dataset. * @param series the series index (zero-based). * @param item the item index (zero-based). * @param crosshairState crosshair information for the plot * (<code>null</code> permitted). * @param pass the pass index. */ public void drawItem(Graphics2D g2, XYItemRendererState state, Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot, ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset, int series, int item, CrosshairState crosshairState, int pass) { if (!getItemVisible(series, item)) { return; } XYAreaRendererState areaState = (XYAreaRendererState) state; // get the data point... double x1 = dataset.getXValue(series, item); double y1 = dataset.getYValue(series, item); if (Double.isNaN(y1)) { y1 = 0.0; } double transX1 = domainAxis.valueToJava2D(x1, dataArea, plot.getDomainAxisEdge()); double transY1 = rangeAxis.valueToJava2D(y1, dataArea, plot.getRangeAxisEdge()); // get the previous point and the next point so we can calculate a // "hot spot" for the area (used by the chart entity)... int itemCount = dataset.getItemCount(series); double x0 = dataset.getXValue(series, Math.max(item - 1, 0)); double y0 = dataset.getYValue(series, Math.max(item - 1, 0)); if (Double.isNaN(y0)) { y0 = 0.0; } double transX0 = domainAxis.valueToJava2D(x0, dataArea, plot.getDomainAxisEdge()); double transY0 = rangeAxis.valueToJava2D(y0, dataArea, plot.getRangeAxisEdge()); double x2 = dataset.getXValue(series, Math.min(item + 1, itemCount - 1)); double y2 = dataset.getYValue(series, Math.min(item + 1, itemCount - 1)); if (Double.isNaN(y2)) { y2 = 0.0; } double transX2 = domainAxis.valueToJava2D(x2, dataArea, plot.getDomainAxisEdge()); double transY2 = rangeAxis.valueToJava2D(y2, dataArea, plot.getRangeAxisEdge()); double transZero = rangeAxis.valueToJava2D(0.0, dataArea, plot.getRangeAxisEdge()); Polygon hotspot = null; if (plot.getOrientation() == PlotOrientation.HORIZONTAL) { hotspot = new Polygon(); hotspot.addPoint((int) transZero, (int) ((transX0 + transX1) / 2.0)); hotspot.addPoint((int) ((transY0 + transY1) / 2.0), (int) ((transX0 + transX1) / 2.0)); hotspot.addPoint((int) transY1, (int) transX1); hotspot.addPoint((int) ((transY1 + transY2) / 2.0), (int) ((transX1 + transX2) / 2.0)); hotspot.addPoint((int) transZero, (int) ((transX1 + transX2) / 2.0)); } else { // vertical orientation hotspot = new Polygon(); hotspot.addPoint((int) ((transX0 + transX1) / 2.0), (int) transZero); hotspot.addPoint((int) ((transX0 + transX1) / 2.0), (int) ((transY0 + transY1) / 2.0)); hotspot.addPoint((int) transX1, (int) transY1); hotspot.addPoint((int) ((transX1 + transX2) / 2.0), (int) ((transY1 + transY2) / 2.0)); hotspot.addPoint((int) ((transX1 + transX2) / 2.0), (int) transZero); } if (item == 0) { // create a new area polygon for the series areaState.area = new Polygon(); // the first point is (x, 0) double zero = rangeAxis.valueToJava2D(0.0, dataArea, plot.getRangeAxisEdge()); if (plot.getOrientation() == PlotOrientation.VERTICAL) { areaState.area.addPoint((int) transX1, (int) zero); } else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) { areaState.area.addPoint((int) zero, (int) transX1); } } // Add each point to Area (x, y) if (plot.getOrientation() == PlotOrientation.VERTICAL) { areaState.area.addPoint((int) transX1, (int) transY1); } else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) { areaState.area.addPoint((int) transY1, (int) transX1); } PlotOrientation orientation = plot.getOrientation(); Paint paint = getItemPaint(series, item); Stroke stroke = getItemStroke(series, item); g2.setPaint(paint); g2.setStroke(stroke); Shape shape = null; if (getPlotShapes()) { shape = getItemShape(series, item); if (orientation == PlotOrientation.VERTICAL) { shape = ShapeUtilities.createTranslatedShape(shape, transX1, transY1); } else if (orientation == PlotOrientation.HORIZONTAL) { shape = ShapeUtilities.createTranslatedShape(shape, transY1, transX1); } g2.draw(shape); } if (getPlotLines()) { if (item > 0) { if (plot.getOrientation() == PlotOrientation.VERTICAL) { areaState.line.setLine(transX0, transY0, transX1, transY1); } else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) { areaState.line.setLine(transY0, transX0, transY1, transX1); } g2.draw(areaState.line); } } // Check if the item is the last item for the series. // and number of items > 0. We can't draw an area for a single point. if (getPlotArea() && item > 0 && item == (itemCount - 1)) { if (orientation == PlotOrientation.VERTICAL) { // Add the last point (x,0) areaState.area.addPoint((int) transX1, (int) transZero); } else if (orientation == PlotOrientation.HORIZONTAL) { // Add the last point (x,0) areaState.area.addPoint((int) transZero, (int) transX1); } Paint fillPaint = getItemFillPaint(series, item); if (fillPaint instanceof GradientPaint) { GradientPaint gp = (GradientPaint) fillPaint; GradientPaintTransformer t = new StandardGradientPaintTransformer(); fillPaint = t.transform(gp, areaState.area.getBounds()); } g2.setPaint(fillPaint); g2.fill(areaState.area); // draw an outline around the Area. if (isOutline()) { g2.setStroke(getItemOutlineStroke(series, item)); g2.setPaint(getItemOutlinePaint(series, item)); g2.draw(areaState.area); } } updateCrosshairValues(crosshairState, x1, y1, transX1, transY1, orientation); // collect entity and tool tip information... if (state.getInfo() != null) { EntityCollection entities = state.getEntityCollection(); if (entities != null && hotspot != null) { String tip = null; XYToolTipGenerator generator = getToolTipGenerator(series, item); if (generator != null) { tip = generator.generateToolTip(dataset, series, item); } String url = null; if (getURLGenerator() != null) { url = getURLGenerator().generateURL(dataset, series, item); } XYItemEntity entity = new XYItemEntity(hotspot, dataset, series, item, tip, url); entities.add(entity); } } } }