我正在嘗試將影像旋轉到游標位置（旋轉應該是從影像的中心開始并旋轉到游標位置）
public void rotateImg(Graphics g)
{
Graphics2D g2 = (Graphics2D)g.create();
int cursorX = MouseInfo.getPointerInfo().getLocation().x - panel.getLocationOnScreen().x; // Mouse pos
int cursorY = MouseInfo.getPointerInfo().getLocation().y - panel.getLocationOnScreen().y;
Point center = new Point(x size/2,y size/2); //Image center (x,y are the player's coordinates)
double dx = cursorX - center.getX();
double dy =cursorY - center.getY();
System.out.println(Math.toDegrees(Math.atan2(dx,dy)));
g2.rotate(Math.toRadians(Math.atan2(dy,dx)),center.x,center.y);
g2.drawImage(playerImage,x,y,size,size, null);
}
這個函式在一個執行緒內運行，所以它永遠不會停止，我檢查了游標位置是否正在更新（它們是），角度也是如此，但是當我運行它時，它幾乎沒有旋轉，甚至不能旋轉 45 度
先謝謝了！
uj5u.com熱心網友回復：
試過這個：
public void rotateImg(Graphics g)
{
double degrees;
Graphics2D g2 = (Graphics2D)g.create();
Point center = new Point(x size/2,y size/2); //Image center (x,y are the player's coordinates)
int cursorX = MouseInfo.getPointerInfo().getLocation().x - panel.getLocationOnScreen().x; // Mouse pos
int cursorY = MouseInfo.getPointerInfo().getLocation().y - panel.getLocationOnScreen().y;
double dx = cursorX - center.getX();
double dy = cursorY - center.getY();
degrees = Math.toDegrees(Math.atan2(dy,dx)) 90;
g2.rotate(Math.toRadians(degrees),center.x,center.y);
g2.drawImage(playerImage,x,y,size,size, null);
}
有效！
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