使用java.awt.BasicStroke动画化虚线

有没有办法使用java.awt中的BasicStroke生成动画虚线？ 我的愿望是以与Photoshop的矩形品牌工具的动画线相同的方式运行虚线。

Answer 1

使用虚线， Thread （或Swing Timer ）并将它们与repaint()结合使用，并对破折号的开始和结束位置进行一些调整 – 然后就可以了。

例

 package test; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Graphics2D; import java.awt.Shape; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.geom.Rectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.SwingUtilities; import javax.swing.Timer; public class AnimatedStroke { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { BasicStroke dashedStroke; final int width = 100; final int height = 30; final BufferedImage image = new BufferedImage( width,height,BufferedImage.TYPE_INT_ARGB); final JLabel label = new JLabel(new ImageIcon(image)); int pad = 5; final Shape rectangle = new Rectangle2D.Double( (double)pad,(double)pad, (double)(width-2*pad), (double)(height-2*pad)); ActionListener listener = new ActionListener() { float dashPhase = 0f; float dash[] = {5.0f,5.0f}; @Override public void actionPerformed(ActionEvent ae) { dashPhase += 9.0f; BasicStroke dashedStroke = new BasicStroke( 1.5f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER, 1.5f, //miter limit dash, dashPhase ); Graphics2D g = image.createGraphics(); g.setColor(Color.WHITE); g.fillRect(0,0,width,height); g.setColor(Color.BLACK); g.setStroke(dashedStroke); g.draw(rectangle); g.dispose(); label.repaint(); /* if (dashPhase<100f) { try { ImageIO.write( image, "PNG", new File("img" + dashPhase + ".png")); } catch(IOException ioe) { // we tried } }*/ } }; Timer timer = new Timer(40, listener); timer.start(); JOptionPane.showMessageDialog(null, label); } }); } }