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前言 :
這裡透過繼承 BarRenderer3D 新建類別 CylinderRenderer 來達成 3D 漸層的效果. 執行效果如下 :

範例代碼 :
在使用下面代碼時, 請在 Classpath 引入 jcommon-1.0.16.jar 與 jfreechart-1.0.13.jar (或更高版本).
- CylinderRenderer.java :

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package test;



import java.awt.GradientPaint;

import java.awt.Graphics2D;

import java.awt.geom.*;

import org.jfree.chart.axis.CategoryAxis;

import org.jfree.chart.axis.ValueAxis;

import org.jfree.chart.entity.CategoryItemEntity;

import org.jfree.chart.entity.EntityCollection;

import org.jfree.chart.labels.CategoryToolTipGenerator;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.chart.renderer.category.BarRenderer3D;

import org.jfree.chart.renderer.category.CategoryItemRendererState;

import org.jfree.chart.urls.CategoryURLGenerator;

import org.jfree.data.category.CategoryDataset;

import org.jfree.ui.GradientPaintTransformer;



public class CylinderRenderer extends BarRenderer3D

{



    public CylinderRenderer()

    {

    }



    public CylinderRenderer(double d, double d1)

    {

        super(d, d1);

    }



    public void drawItem(Graphics2D graphics2d, CategoryItemRendererState categoryitemrendererstate, Rectangle2D rectangle2d, CategoryPlot categoryplot, CategoryAxis categoryaxis, ValueAxis valueaxis, CategoryDataset categorydataset,

            int i, int j, int k)

    {

        Number number = categorydataset.getValue(i, j);

        if(number == null)

            return;

        double d = number.doubleValue();

        java.awt.geom.Rectangle2D.Double double1 = new java.awt.geom.Rectangle2D.Double(rectangle2d.getX(), rectangle2d.getY() + getYOffset(), rectangle2d.getWidth() - getXOffset(), rectangle2d.getHeight() - getYOffset());

        PlotOrientation plotorientation = categoryplot.getOrientation();

        double d1 = calculateBarW0(categoryplot, plotorientation, double1, categoryaxis, categoryitemrendererstate, i, j);

        double ad[] = calculateBarL0L1(d);

        if(ad == null)

            return;

        org.jfree.ui.RectangleEdge rectangleedge = categoryplot.getRangeAxisEdge();

        float f = (float)valueaxis.valueToJava2D(ad[0], double1, rectangleedge);

        float f1 = (float)valueaxis.valueToJava2D(ad[1], double1, rectangleedge);

        float f2 = Math.min(f, f1);

        float f3 = Math.abs(f1 - f);

        GeneralPath generalpath = new GeneralPath();

        if(plotorientation == PlotOrientation.HORIZONTAL)

        {

            generalpath.moveTo(f2, (float)d1);

            generalpath.lineTo(f2, (float)(d1 + categoryitemrendererstate.getBarWidth()));

            generalpath.lineTo(f2 + f3, (float)(d1 + categoryitemrendererstate.getBarWidth()));

            generalpath.lineTo(f2 + f3, (float)d1);

            generalpath.closePath();

        } else

        {

            generalpath.moveTo((float)d1, (float)((double)f2 - getYOffset() / 2D));

            generalpath.lineTo((float)d1, (float)((double)(f2 + f3) - getYOffset() / 2D));

            java.awt.geom.Arc2D.Double double2 = new java.awt.geom.Arc2D.Double(d1, (double)(f2 + f3) - getYOffset(), categoryitemrendererstate.getBarWidth(), getYOffset(), 180D, 180D, 0);

            generalpath.append(double2, true);

            generalpath.lineTo((float)(d1 + categoryitemrendererstate.getBarWidth()), (float)((double)f2 - getYOffset() / 2D));

            double2 = new java.awt.geom.Arc2D.Double(d1, (double)f2 - getYOffset(), categoryitemrendererstate.getBarWidth(), getYOffset(), 0.0D, -180D, 0);

            generalpath.append(double2, true);

            generalpath.closePath();

        }

        Object obj = getItemPaint(i, j);

        if(getGradientPaintTransformer() != null && (obj instanceof GradientPaint))

        {

            GradientPaint gradientpaint = (GradientPaint)obj;

            obj = getGradientPaintTransformer().transform(gradientpaint, generalpath);

        }

        graphics2d.setPaint(((java.awt.Paint) (obj)));

        graphics2d.fill(generalpath);

        java.awt.geom.Ellipse2D.Double double3 = new java.awt.geom.Ellipse2D.Double(d1, (double)f2 - getYOffset(), categoryitemrendererstate.getBarWidth(), getYOffset());

        if(obj instanceof GradientPaint)

            graphics2d.setPaint(((GradientPaint)obj).getColor2());

        graphics2d.fill(double3);

        if(isDrawBarOutline() && categoryitemrendererstate.getBarWidth() > 3D)

        {

            graphics2d.setStroke(getItemOutlineStroke(i, j));

            graphics2d.setPaint(getItemOutlinePaint(i, j));

            graphics2d.draw(generalpath);

            if(double3 != null)

                graphics2d.draw(double3);

        }

        org.jfree.chart.labels.CategoryItemLabelGenerator categoryitemlabelgenerator = getItemLabelGenerator(i, j);

        if(categoryitemlabelgenerator != null && isItemLabelVisible(i, j))

            drawItemLabel(graphics2d, categorydataset, i, j, categoryplot, categoryitemlabelgenerator, generalpath.getBounds2D(), d < 0.0D);

        if(categoryitemrendererstate.getInfo() != null)

        {

            EntityCollection entitycollection = categoryitemrendererstate.getEntityCollection();

            if(entitycollection != null)

            {

                String s = null;

                CategoryToolTipGenerator categorytooltipgenerator = getToolTipGenerator(i, j);

                if(categorytooltipgenerator != null)

                    s = categorytooltipgenerator.generateToolTip(categorydataset, i, j);

                String s1 = null;

                if(getItemURLGenerator(i, j) != null)

                    s1 = getItemURLGenerator(i, j).generateURL(categorydataset, i, j);

                CategoryItemEntity categoryitementity = new CategoryItemEntity(generalpath.getBounds2D(), s, s1, categorydataset, i, categorydataset.getColumnKey(j), j);

                entitycollection.add(categoryitementity);

            }

        }

    }

}

- CylinderChartdemo1.java : 主程式

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package test;



import java.awt.*;

import javax.swing.JPanel;

import org.jfree.chart.*;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.data.category.CategoryDataset;

import org.jfree.data.category.DefaultCategoryDataset;

import org.jfree.ui.*;



/**

* Reference

*  - http://read.pudn.com/downloads94/sourcecode/java/378182/demo1.0.6%20src/demo/CylinderChartDemo1.java__.htm

*  - http://www.koders.com/java/fid906FA2E5BC738E0DF4BC3A8C9A7916854086DE18.aspx?s=160

* @author John-Lee

*

*/

public class CylinderChartdemo1 extends ApplicationFrame{

    static class CustomCylinderRenderer extends CylinderRenderer

    {



        public Paint getItemPaint(int i, int j)

        {

            return colors[j % colors.length];

        }



        private Paint colors[];



        public CustomCylinderRenderer(Paint apaint[])

        {

            colors = apaint;

        }

    }





    public CylinderChartdemo1(String s)

    {

        super(s);

        CategoryDataset categorydataset = createDataset();

        JFreeChart jfreechart = createChart(categorydataset);

        ChartPanel chartpanel = new ChartPanel(jfreechart);

        chartpanel.setPreferredSize(new Dimension(500, 270));

        setContentPane(chartpanel);

    }



    private static CategoryDataset createDataset()

    {

        DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();

        defaultcategorydataset.addValue(4D, "S1", "Monday");

        defaultcategorydataset.addValue(5D, "S1", "Tuesday");

        defaultcategorydataset.addValue(7D, "S1", "Wednesday");

        defaultcategorydataset.addValue(6D, "S1", "Thursday");

        defaultcategorydataset.addValue(4D, "S1", "Friday");

        return defaultcategorydataset;

    }



    private static JFreeChart createChart(CategoryDataset categorydataset)

    {

        JFreeChart jfreechart = ChartFactory.createBarChart3D("Cylinder Chart demo", "Category", "Value", categorydataset, PlotOrientation.VERTICAL, false, true, false);

        CategoryPlot categoryplot = (CategoryPlot)jfreechart.getPlot();

        Paint apaint[] = createPaint();

        CustomCylinderRenderer customcylinderrenderer = new CustomCylinderRenderer(apaint);

        customcylinderrenderer.setGradientPaintTransformer(newStandardGradientPaintTransformer(GradientPaintTransformType.CENTER_HORIZONTAL));

        customcylinderrenderer.setOutlinePaint(Color.gray);

        customcylinderrenderer.setOutlineStroke(new BasicStroke(0.3F));

        categoryplot.setRenderer(customcylinderrenderer);

        return jfreechart;

    }



    private static Paint[] createPaint()

    {

        Paint apaint[] = new Paint[5];

        apaint[0] = new GradientPaint(0.0F, 0.0F, Color.white, 0.0F, 0.0F, Color.red);

        apaint[1] = new GradientPaint(0.0F, 0.0F, Color.white, 0.0F, 0.0F, Color.green);

        apaint[2] = new GradientPaint(0.0F, 0.0F, Color.white, 0.0F, 0.0F, Color.blue);

        apaint[3] = new GradientPaint(0.0F, 0.0F, Color.white, 0.0F, 0.0F, Color.orange);

        apaint[4] = new GradientPaint(0.0F, 0.0F, Color.white, 0.0F, 0.0F, Color.magenta);

        return apaint;

    }



    public static JPanel createdemoPanel()

    {

        JFreeChart jfreechart = createChart(createDataset());

        return new ChartPanel(jfreechart);

    }



    public static void main(String args[])

    {

        CylinderChartdemo1 cylinderchartdemo1 = new CylinderChartdemo1("Cylinder Chart demo 1");

        cylinderchartdemo1.pack();

        RefineryUtilities.centerFrameOnScreen(cylinderchartdemo1);

        cylinderchartdemo1.setVisible(true);

    }

}

This message was edited 1 time. Last update was at 01/12/2011 09:16:14

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2011年11月30日星期三

[ Java 代碼範本 ] JFreeChart : 3D BarChart with Blends - Demo 3 (多維度的3D 漸層長條圖)

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