Java图形开发相关

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Swing渲染基本原理

1.事件：事件派发线程（EDT）；

2.绘制：

1)异步重绘：Component.repaint() 、Component.repaint(int x, int y, int width, int height)

2)同步绘制：JComponent.paintImmediately(int x, int y, int width, int height)和JComponent.paintlmmediately(Rectangle r) 、Component.paint(Graphics g)

3.渲染：

JComponent.paintComponent(Graphics g) 、Component.paint(Graphics g) 、Jcomponent.setOpaque(Boolean b)

1)paintComponent()

import java.awt.Color;import java.awt.Graphics;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.SwingUtilities;@SuppressWarnings("serial")public class OvalComponent extends JComponent {public void paintComponent(Graphics g) {g.setColor(getBackground());g.fillRect(0, 0, getWidth(), getHeight());g.setColor(Color.GRAY);g.fillOval(0, 0, getWidth(), getHeight());}public static void main(String[] args) {SwingUtilities.invokeLater(new Runnable() {@Overridepublic void run() {JFrame frame = new JFrame("Oval");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(200, 180);frame.add(new OvalComponent());frame.setVisible(true);}});}}

2)paint()

import java.awt.AlphaComposite;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.SwingUtilities;@SuppressWarnings("serial")public class TranslucentButton extends JButton {BufferedImage buttonImage;public TranslucentButton(String label) {super(label);setOpaque(false);}public void paint(Graphics g) {if(buttonImage == null ||buttonImage.getWidth() != getWidth() ||buttonImage.getHeight() != getHeight()) {buttonImage = (BufferedImage)createImage(getWidth(),getHeight());}Graphics gButton = buttonImage.getGraphics();gButton.setClip(g.getClip());super.paint(gButton);Graphics2D g2d = (Graphics2D)g;AlphaComposite newComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,.5f);g2d.setComposite(newComposite);g2d.drawImage(buttonImage, 0, 0, null);}public static void main(String[] args) {SwingUtilities.invokeLater(new Runnable() {@Overridepublic void run() {JFrame frame = new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(200, 100);frame.add(new TranslucentButton("Translucent Button"));frame.setVisible(true);}});}}

3)setOpaque()

4双缓冲

5线程

java.swing.Timer 、SwingWorker

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