RadialShading_Postscript_Condition1.eps

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gsave % first save
matrix currentmatrix   % pushCTM()
setmatrix % restore CTM
matrix currentmatrix   % pushCTM()
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% clip
% writeRadialGradient()
<<
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RadialShading_Postscript_Condition2.eps

%!PS-Adobe EPSF-3.0
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%%EndComments
%%BeginProlog
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%%BeginPageSetup
gsave % first save
matrix currentmatrix   % pushCTM()
setmatrix % restore CTM
matrix currentmatrix   % pushCTM()
[ 0.827538 0.0 0.0 -0.827538 0.0 678.974965 ] concat
%%EndPageSetup
gsave
583.9428 312.0 moveto
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483.45633 87.55719 583.9428 188.04366 583.9428 312.0 curveto
closepath
clip
% writeRadialGradient()
<<
 /ShadingType 3
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stroke
showpage
grestore 
%%EOF

RadialShading_Postscript_Condition3.eps

%!PS-Adobe EPSF-3.0
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%%Pages: 0
%%EndComments
%%BeginProlog
%%EndProlog
%%BeginSetup
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gsave % first save
matrix currentmatrix   % pushCTM()
setmatrix % restore CTM
matrix currentmatrix   % pushCTM()
[ 0.827538 0.0 0.0 -0.827538 0.0 678.974965 ] concat
%%EndPageSetup
gsave
583.9428 312.0 moveto
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135.05719 188.04366 235.54366 87.55719 359.5 87.55719 curveto
483.45633 87.55719 583.9428 188.04366 583.9428 312.0 curveto
closepath
clip
% writeRadialGradient()
<<
 /ShadingType 3
 /ColorSpace [ /DeviceRGB ]
 /Coords [247.271652 199.771652 224.4567 247.271652 199.771652 0.00]
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% draw
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closepath
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showpage
grestore 
%%EOF

RadialShadingPanel.java

import javax.swing.*;
import java.awt.*;
import java.awt.geom.Ellipse2D;

/**
 * A frame containing a panel that shows how to draw a circle with a shading gradient color.
 * <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/RadialGradientPaint.html">RadialGradientPaint doc in English</a>
 * <a href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/awt/RadialGradientPaint.html">RadialGradientPaint doc in Chinese</a>
 */

public class RadialShadingPanel extends JPanel {

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        float x = 250;
        float y = 250;
        float radius = 150;
        Color customizedColor1 = Color.WHITE;
        Color customizedColor2 = new Color(240, 0, 0);
        Paint customizedPaint = new RadialGradientPaint(
                x - radius * 0.5F, y - radius * 0.5F,
                radius,
                x - radius * 0.5F, y - radius * 0.5F,
                new float[]{0F, 1F},
                new Color[]{customizedColor1, customizedColor2},
                MultipleGradientPaint.CycleMethod.NO_CYCLE);

        ((Graphics2D) g).setPaint(customizedPaint);
        ((Graphics2D) g).fill(new Ellipse2D.Float(x - radius, y - radius, radius * 2, radius * 2));
    }

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setSize(500, 500);
        f.setTitle("Circle with a shading gradient color");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(new RadialShadingPanel());
        f.setVisible(true);
    }
}