我正在尝试在OS X中创建一个简单的JFrame窗口,并使用Graphics2d在其上呈现一个简单的黑色方块：
public Start() {
running = true;
window = new JFrame("Finest Hour");
window.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
window.setPreferredSize(new Dimension(500,500));
window.setSize(window.getPreferredSize());
FullScreenUtilities.setWindowCanFullScreen(window,true);
window.setIgnoreRepaint(true);
window.setVisible(true);
window.createBufferStrategy(2);
strategy = window.getBufferStrategy();
}
public static void main(String[] args) {
Start s = new Start();
s.loop();
}
public void loop() {
Random random = new Random();
while(running) {
Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
g.setColor(Color.black);
g.fillRect(20,20,40,40);
strategy.show();
}
}
然而,当我使用strategy.show()时,窗口似乎在底部没有圆角. ：
无缓冲策略渲染它,即：Graphics2D =(Graphics2D)window.getGraphics();生产一个圆角窗口：
最佳答案
对我来说很好.
public class TestMacFrame extends JFrame {
public TestMacFrame() throws HeadlessException {
super("Testing");
setSize(200,200);
setLocationRelativeTo(null);
setDefaultCloSEOperation(EXIT_ON_CLOSE);
setLayout(new BorderLayout());
add(new PaintPane());
setVisible(true);
}
protected class PaintPane extends JPanel {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
int width = getWidth() - 1;
int height = getHeight() - 1;
g.setColor(Color.BLACK);
int blockWidth = width / 2;
int blockHeight = height / 2;
int x = (width - blockWidth) / 2;
int y = (height - blockHeight) / 2;
g.fillRect(x,y,blockWidth,blockHeight);
}
}
public static void main(String[] args) {
new TestMacFrame();
}
}
现在,我不知道你想要的是什么,但我可以告诉你：
public void loop() {
Random random = new Random();
while(running) {
Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
g.setColor(Color.black);
g.fillRect(20,40);
strategy.show();
}
}
是个坏主意.首先,正如SoboLAN指出的那样,您正试图在Event Dispatching Thread外侧更新UI组件.Swing组件不是Thread安全的.
其次,这个循环最终会破坏你的cpu周期,使你的应用程序和整个系统都无法使用.
动画更新
在这里,试试这个.这是一个非常基本的例子;)
public class TestMacFrame extends JFrame {
private float angel = 0;
private Timer timer;
public TestMacFrame() throws HeadlessException {
super("Testing");
setSize(200,200);
setLocationRelativeTo(null);
setDefaultCloSEOperation(EXIT_ON_CLOSE);
setLayout(new BorderLayout());
add(new PaintPane());
setVisible(true);
timer = new Timer(25,new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
angel += 1;
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.setInitialDelay(0);
timer.start();
}
protected class PaintPane extends JPanel {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int width = getWidth() - 1;
int height = getHeight() - 1;
g.setColor(Color.BLACK);
int blockWidth = width / 2;
int blockHeight = height / 2;
int x = (width - blockWidth) / 2;
int y = (height - blockHeight) / 2;
g2d.setTransform(AffineTransform.getRotateInstance(Math.toRadians(angel),width / 2,height / 2));
g2d.fillRect(x,blockHeight);
g2d.dispose();
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new TestMacFrame();
}
}
