backgroundpainter.java

来自「很难有的Synth观感实例」· Java 代码 · 共 38 行

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.CubicCurve2D;

import javax.swing.UIManager;
import javax.swing.plaf.synth.SynthContext;
import javax.swing.plaf.synth.SynthPainter;


public class BackgroundPainter extends SynthPainter 
{	
	
  public void paintPanelBackground(SynthContext context,
										  Graphics g, int x, int y,
										  int w, int h) 
	{
		Color start = UIManager.getColor("Panel.startBackground");
		Color end = UIManager.getColor("Panel.endBackground");
		Graphics2D g2 = (Graphics2D)g;
		GradientPaint grPaint = new GradientPaint(
		            (float)x, (float)y, start,
		            (float)w, (float)h, end);
		g2.setPaint(grPaint);
		g2.fillRect(x, y, w, h);
		g2.setPaint(null);
		g2.setColor(new Color(255, 255, 255, 120));
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		CubicCurve2D.Double arc2d = new CubicCurve2D.Double(0, h/4, w/3, h/10, .66 * w, 1.5 * h, w, h/8);
		g2.draw(arc2d);
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
	}
}