这是在给定坐标处绘制形状的函数:
public void drawTank(int x,int y){
int h = 50;
int w = 50;
graphic.setColor(Color.darkGray);
graphic.drawRect(x, y, h, w);
graphic.fillRect(x, y, h, w);
graphic.setColor(Color.GRAY);
graphic.drawRect(x+50, y+20, 35, 10);
graphic.fillRect(x+50, y+20, 35, 10);
}
我想在上面的函数中添加一个名为“angle”的变量,以便图像也按指定的角度旋转(drawTank(int x,int y,int angle)。
已更新示例
我试图做的是初始化 Graphics2D 并分别更改我的代码:
g2D.setColor(Color.darkGray);
g2D.drawRect(x, y, h, w);
g2D.fillRect(x, y, h, w);
g2D.setColor(Color.red);
g2D.drawRect(x+50, y+20, 35, 10);
g2D.fillRect(x+50, y+20, 35, 10);
g2D.rotate((Math.toRadians(angle)));
但是,这实际上没有任何作用。 :/
最佳答案
优先级很重要...
在第二个示例中,您在绘制所有内容后应用旋转。这不是图形的工作原理。您需要首先应用转换,然后接下来的所有内容都将使用该转换。
public class TestRotateImage {
public static void main(String[] args) {
new TestRotateImage();
}
public TestRotateImage() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JSlider slider;
private Rectangle rectangle;
public TestPane() {
setLayout(new BorderLayout());
rectangle = new Rectangle(0, 0, 100, 100);
slider = new JSlider();
slider.setMinimum(0);
slider.setMaximum(360);
slider.setMinorTickSpacing(5);
slider.setMajorTickSpacing(10);
slider.setValue(0);
add(slider, BorderLayout.SOUTH);
slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
repaint();
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
public double getAngle() {
return Math.toRadians(slider.getValue());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(Color.RED);
g2d.drawLine(getWidth() / 2, 0, getWidth() / 2, getHeight());
g2d.drawLine(0, getHeight() / 2, getWidth(), getHeight() / 2);
g2d.setColor(Color.BLACK);
int x = (getWidth() - rectangle.width) / 2;
int y = (getHeight() - rectangle.height) / 2;
AffineTransform at = new AffineTransform();
at.setToRotation(getAngle(), x + (rectangle.width / 2), y + (rectangle.height / 2));
at.translate(x, y);
g2d.setTransform(at);
g2d.draw(rectangle);
g2d.dispose();
}
}
}
您可能想看看Transforming Shapes, Text and Images了解更多信息
关于java - java中将图像旋转指定角度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14884480/