Java tutorial
/* * This class is derived from JFreeChart 1.0.9 StackedXYAreaRenderer2 * and XYLineAndShapeRenderer which have the following copyright: */ /* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2007, 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.] * * --------------------------- * StackedXYAreaRenderer2.java * --------------------------- * (C) Copyright 2004-2007, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited), based on * the StackedXYAreaRenderer class by Richard Atkinson; * Contributor(s): -; * * --------------------------- * XYLineAndShapeRenderer.java * --------------------------- * (C) Copyright 2004-2007, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; */ package de.saring.util.gui.jfreechart; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.entity.EntityCollection; import org.jfree.chart.labels.XYToolTipGenerator; import org.jfree.chart.plot.CrosshairState; import org.jfree.chart.plot.PlotRenderingInfo; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.StackedXYAreaRenderer2; import org.jfree.chart.renderer.xy.XYItemRendererState; import org.jfree.chart.urls.XYURLGenerator; import org.jfree.data.Range; import org.jfree.data.xy.TableXYDataset; import org.jfree.data.xy.XYDataset; import org.jfree.ui.RectangleEdge; import java.awt.*; import java.awt.geom.GeneralPath; import java.awt.geom.Rectangle2D; /** * A stacked area renderer which supports transparency. * * @author Kai Pastor, based on the StackedXYAreaRenderer class * by David Gilbert (for Object Refinery Limited), * which is based on the StackedXYAreaRenderer class * by Richard Atkinson; */ public class StackedRenderer extends StackedXYAreaRenderer2 { private static final long serialVersionUID = 7251046217195966375L; /** * The alpha component to be used for the area (0.0 ... 1.0). */ private float areaAlpha; /** * This flag controls whether or not the x-coordinates (in Java2D space) * are rounded to integers. When set to true, this can avoid the vertical * striping that anti-aliasing can generate. However, the rounding may not * be appropriate for output in high resolution formats (for example, * vector graphics formats such as SVG and PDF). * * @since 1.0.3 */ private boolean roundXCoordinates; /** * Creates a new renderer. */ public StackedRenderer() { this(null, null); } /** * Constructs a new renderer. * * @param labelGenerator the tool tip generator to use. <code>null</code> * is none. * @param urlGenerator the URL generator (<code>null</code> permitted). */ public StackedRenderer(XYToolTipGenerator labelGenerator, XYURLGenerator urlGenerator) { super(labelGenerator, urlGenerator); this.roundXCoordinates = super.getRoundXCoordinates(); this.areaAlpha = 0.5f; } /** * Sets the alpha component to be applied for the area paint. * * @param areaAlpha the alpha component (0.0 ... 1.0) */ public void setAreaAlpha(float areaAlpha) { this.areaAlpha = areaAlpha; } /** * Gets the alpha component to be applied for the area paint. * * @return the alpha component (0.0 ... 1.0) */ public float getAreaAlpha() { return areaAlpha; } /** * Sets the flag that controls whether or not the x-coordinates (in * Java2D space) are rounded to integer values, and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param round the new flag value. * @see #getRoundXCoordinates() * @since 1.0.4 */ @Override public void setRoundXCoordinates(boolean round) { this.roundXCoordinates = round; super.setRoundXCoordinates(true); } /** * Returns the range of values the renderer requires to display all the * items from the specified dataset. * * @param dataset the dataset (<code>null</code> permitted). * @return The range (or <code>null</code> if the dataset is * <code>null</code> or empty). */ @Override public Range findRangeBounds(XYDataset dataset) { if (dataset == null) { return null; } double min = Double.POSITIVE_INFINITY; double max = Double.NEGATIVE_INFINITY; TableXYDataset d = (TableXYDataset) dataset; int itemCount = d.getItemCount(); for (int i = 0; i < itemCount; i++) { double[] stackValues = getStackValues((TableXYDataset) dataset, d.getSeriesCount(), i); min = Math.min(min, stackValues[0]); max = Math.max(max, stackValues[1]); } if (min == Double.POSITIVE_INFINITY) { return null; } return new Range(min, max); } /** * Returns the number of passes required by the renderer. * * @return 1. */ @Override public int getPassCount() { return 2; } /** * 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 information about crosshairs on a plot. * @param pass the pass index. */ @Override 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) { // setup for collecting optional entity info... Shape entityArea = null; EntityCollection entities = null; if (info != null) { entities = info.getOwner().getEntityCollection(); } TableXYDataset tdataset = (TableXYDataset) dataset; // get the data point... double x1 = dataset.getXValue(series, item); double y1 = dataset.getYValue(series, item); if (Double.isNaN(y1)) { y1 = 0.0; } double[] stack1 = getStackValues(tdataset, series, item); // get the previous point and the next point so we can calculate a // "hot spot" for the area (used by the chart entity)... 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[] stack0 = getStackValues(tdataset, series, Math.max(item - 1, 0)); int itemCount = dataset.getItemCount(series); 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[] stack2 = getStackValues(tdataset, series, Math.min(item + 1, itemCount - 1)); double xleft = (x0 + x1) / 2.0; double xright = (x1 + x2) / 2.0; double[] stackLeft = averageStackValues(stack0, stack1); double[] stackRight = averageStackValues(stack1, stack2); double[] adjStackLeft = adjustedStackValues(stack0, stack1); double[] adjStackRight = adjustedStackValues(stack1, stack2); RectangleEdge edge0 = plot.getDomainAxisEdge(); float transX1 = (float) domainAxis.valueToJava2D(x1, dataArea, edge0); float transXLeft = (float) domainAxis.valueToJava2D(xleft, dataArea, edge0); float transXRight = (float) domainAxis.valueToJava2D(xright, dataArea, edge0); if (this.roundXCoordinates) { transX1 = Math.round(transX1); transXLeft = Math.round(transXLeft); transXRight = Math.round(transXRight); } float transY1; RectangleEdge edge1 = plot.getRangeAxisEdge(); GeneralPath left = new GeneralPath(); GeneralPath right = new GeneralPath(); if (y1 >= 0.0) { // handle positive value transY1 = (float) rangeAxis.valueToJava2D(y1 + stack1[1], dataArea, edge1); float transStack1 = (float) rangeAxis.valueToJava2D(stack1[1], dataArea, edge1); float transStackLeft = (float) rangeAxis.valueToJava2D(stackLeft[1], dataArea, edge1); // other than StackedXYAreaRenderer2! // LEFT POLYGON if (y0 >= 0.0) { double yleft = (y0 + y1) / 2.0 + stackLeft[1]; float transYLeft = (float) rangeAxis.valueToJava2D(yleft, dataArea, edge1); left.moveTo(transX1, transY1); left.lineTo(transX1, transStack1); left.lineTo(transXLeft, transStackLeft); left.lineTo(transXLeft, transYLeft); left.closePath(); } else { left.moveTo(transX1, transStack1); left.lineTo(transX1, transY1); left.lineTo(transXLeft, transStackLeft); left.closePath(); } float transStackRight = (float) rangeAxis.valueToJava2D(stackRight[1], dataArea, edge1); // other than StackedXYAreaRenderer2! // RIGHT POLYGON if (y2 >= 0.0) { double yright = (y1 + y2) / 2.0 + stackRight[1]; float transYRight = (float) rangeAxis.valueToJava2D(yright, dataArea, edge1); right.moveTo(transX1, transStack1); right.lineTo(transX1, transY1); right.lineTo(transXRight, transYRight); right.lineTo(transXRight, transStackRight); right.closePath(); } else { right.moveTo(transX1, transStack1); right.lineTo(transX1, transY1); right.lineTo(transXRight, transStackRight); right.closePath(); } } else { // handle negative value transY1 = (float) rangeAxis.valueToJava2D(y1 + stack1[0], dataArea, edge1); float transStack1 = (float) rangeAxis.valueToJava2D(stack1[0], dataArea, edge1); float transStackLeft = (float) rangeAxis.valueToJava2D(adjStackLeft[0], dataArea, edge1); // LEFT POLYGON if (y0 >= 0.0) { left.moveTo(transX1, transStack1); left.lineTo(transX1, transY1); left.lineTo(transXLeft, transStackLeft); left.clone(); } else { double yleft = (y0 + y1) / 2.0 + stackLeft[0]; float transYLeft = (float) rangeAxis.valueToJava2D(yleft, dataArea, edge1); left.moveTo(transX1, transY1); left.lineTo(transX1, transStack1); left.lineTo(transXLeft, transStackLeft); left.lineTo(transXLeft, transYLeft); left.closePath(); } float transStackRight = (float) rangeAxis.valueToJava2D(adjStackRight[0], dataArea, edge1); // RIGHT POLYGON if (y2 >= 0.0) { right.moveTo(transX1, transStack1); right.lineTo(transX1, transY1); right.lineTo(transXRight, transStackRight); right.closePath(); } else { double yright = (y1 + y2) / 2.0 + stackRight[0]; float transYRight = (float) rangeAxis.valueToJava2D(yright, dataArea, edge1); right.moveTo(transX1, transStack1); right.lineTo(transX1, transY1); right.lineTo(transXRight, transYRight); right.lineTo(transXRight, transStackRight); right.closePath(); } } // Get series Paint and Stroke Paint itemPaint = getItemPaint(series, item); if (pass == 0) { g2.setPaint(itemPaint); g2.fill(left); g2.fill(right); } else if (pass == 1) { if (item == 0 || (y1 == 0.0 && y0 == 0.0)) { return; } // get the data point... if (Double.isNaN(y1) || Double.isNaN(x1)) { return; } if (Double.isNaN(y0) || Double.isNaN(x0)) { return; } RectangleEdge xAxisLocation = plot.getDomainAxisEdge(); RectangleEdge yAxisLocation = plot.getRangeAxisEdge(); double transX0 = domainAxis.valueToJava2D(x0, dataArea, xAxisLocation); double transY0 = rangeAxis.valueToJava2D(y0 + stack0[1], dataArea, yAxisLocation); // only draw if we have good values if (Double.isNaN(transX0) || Double.isNaN(transY0) || Double.isNaN(transX1) || Double.isNaN(transY1)) { return; } state.workingLine.setLine(transX0, transY0, transX1, transY1); if (state.workingLine.intersects(dataArea)) { g2.setStroke(getItemStroke(series, item)); g2.setPaint(super.lookupSeriesPaint(series)); g2.draw(state.workingLine); } return; } // add an entity for the item... if (entities != null) { GeneralPath gp = new GeneralPath(left); gp.append(right, false); entityArea = gp; addEntity(entities, entityArea, dataset, series, item, transX1, transY1); } } /** * Calculates the stacked values (one positive and one negative) of all * series up to, but not including, <code>series</code> for the specified * item. It returns [0.0, 0.0] if <code>series</code> is the first series. * * @param dataset the dataset (<code>null</code> not permitted). * @param series the series index. * @param index the item index. * @return An array containing the cumulative negative and positive values * for all series values up to but excluding <code>series</code> * for <code>index</code>. */ private double[] getStackValues(TableXYDataset dataset, int series, int index) { double[] result = new double[2]; for (int i = 0; i < series; i++) { double v = dataset.getYValue(i, index); if (!Double.isNaN(v)) { if (v >= 0.0) { result[1] += v; } else { result[0] += v; } } } return result; } /** * Returns a pair of "stack" values calculated as the mean of the two * specified stack value pairs. * * @param stack1 the first stack pair. * @param stack2 the second stack pair. * @return A pair of average stack values. */ private double[] averageStackValues(double[] stack1, double[] stack2) { double[] result = new double[2]; result[0] = (stack1[0] + stack2[0]) / 2.0; result[1] = (stack1[1] + stack2[1]) / 2.0; return result; } /** * Calculates adjusted stack values from the supplied values. The value is * the mean of the supplied values, unless either of the supplied values * is zero, in which case the adjusted value is zero also. * * @param stack1 the first stack pair. * @param stack2 the second stack pair. * @return A pair of average stack values. */ private double[] adjustedStackValues(double[] stack1, double[] stack2) { double[] result = new double[2]; if (stack1[0] == 0.0 || stack2[0] == 0.0) { result[0] = 0.0; } else { result[0] = (stack1[0] + stack2[0]) / 2.0; } if (stack1[1] == 0.0 || stack2[1] == 0.0) { result[1] = 0.0; } else { result[1] = (stack1[1] + stack2[1]) / 2.0; } return result; } /** * Returns the paint used to fill an item drawn by the renderer. * Overridden for proper display of legend items * * @param series the series index (zero-based). * @return The paint (never <code>null</code>). */ @Override public Paint lookupSeriesPaint(int series) { Paint paint = super.lookupSeriesPaint(series); if (paint instanceof Color) { Color color = (Color) paint; paint = new Color(color.getColorSpace(), color.getColorComponents(null), areaAlpha); } return paint; } /** * Tests this renderer for equality with an arbitrary object. * * @param obj the object (<code>null</code> permitted). * @return A boolean. */ @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof StackedRenderer)) { return false; } StackedRenderer that = (StackedRenderer) obj; if (this.roundXCoordinates != that.roundXCoordinates) { return false; } if (Math.abs(this.areaAlpha - that.areaAlpha) > 0.0000001) { return false; } return super.equals(obj); } @Override public int hashCode() { return 42; } /** * Returns a clone of the renderer. * * @return A clone. * @throws CloneNotSupportedException if the renderer cannot be cloned. */ @Override public Object clone() throws CloneNotSupportedException { return super.clone(); } }