BufferedImage在旋转后被截断
BufferedImage在旋转后被截断
提问于 2015-11-29 01:13:04
我的代码每次“更新”都会将图像旋转0.4度，图像在-10，+10范围内连续旋转。问题是，当它旋转时，缓冲的图像在边缘被切断，似乎旋转改变了bufferedImage需要的大小，但大小永远不会更新，你知道如何让它工作吗？
protected double rotation = 0;
private double rotDir = 0.4;
private BufferedImage getRotatedSprite(){
if(Math.abs(rotation)>10)
rotDir=rotDir*(-1);
rotation+=rotDir;
ImageIcon icon = new ImageIcon(bImage);
BufferedImage bImg = new BufferedImage(icon.getIconWidth(),
icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d= (Graphics2D)bImg.getGraphics();
g2d.rotate(Math.toRadians(rotation), icon.getIconWidth()/2, icon.getIconHeight()/2);
g2d.drawImage(bImage, 0, 0, null);
return bImg;
}
public void drawSprite(Graphics g) {
BufferedImage image = getRotatedSprite();
if(customWidth != -1 && customHeight != -1){
g.drawImage(image, (int)locX, (int)locY, customWidth, customHeight, this);
}else
g.drawImage(image, (int)locX, (int)locY, this);
}回答 1
Stack Overflow用户
发布于 2015-11-29 01:23:20
看起来像是旋转改变了bufferedImage的大小
是的，尺寸会随着旋转角度的不同而变化。
您可能会发现使用Rotated Icon更容易。它会为您执行旋转并重新计算大小(如果需要)。不需要创建新的BufferedImages，您只需设置旋转度。
简单的例子。使用slilder栏旋转图标：
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.*;
public class Rotation3 extends JPanel
{
private Icon icon;
private RotatedIcon rotated;
private int degrees;
public Rotation3(Image image)
{
icon = new ImageIcon( image );
rotated = new RotatedIcon(icon, 0);
// rotated.setCircularIcon( true );
setDegrees( 0 );
setPreferredSize( new Dimension(600, 600) );
}
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
// translate x/y so Icon rotated around a specific point (300, 300)
int x = 300 - (rotated.getIconWidth() / 2);
int y = 300 - (rotated.getIconHeight() / 2);
rotated.paintIcon(this, g, x, y);
g.setColor(Color.RED);
g.fillOval(295, 295, 10, 10);
}
public void setDegrees(int degrees)
{
this.degrees = degrees;
rotated.setDegrees(degrees);
repaint();
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
// String path = "dukewavered.gif";
String path = "lunch75.jpg";
BufferedImage bi = ImageIO.read(Rotation3.class.getResourceAsStream(path));
final Rotation3 r = new Rotation3(bi);
final JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 360, 0);
slider.addChangeListener(new ChangeListener()
{
public void stateChanged(ChangeEvent e)
{
int value = slider.getValue();
r.setDegrees( value );
}
});
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JScrollPane(r));
f.add(slider, BorderLayout.SOUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
catch(IOException e)
{
System.out.println(e);
}
}
});
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/33974090
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