[我正在尝试在Java中使用绘制线并绘制椭圆形

Question

public class MousePointer extends GameFigure {

    public final int SIZE = 10;

    public MousePointer(int x, int y){
        super(x,y);
    }
    @Override
    public void render(Graphics2D g2) {
        g2.setColor(Color.CYAN);
        g2.drawLine((int)location.x - SIZE,(int) location.y,
                (int) location.x + SIZE, (int)location.y);
        g2.drawLine((int)location.x, (int)location.y - SIZE,
                (int)location.x,(int)location.y + SIZE);
        g2.drawOval((int)location.x - SIZE,(int)location.y - SIZE,(int)location.x-SIZE,(int)location.y - SIZE);
    }

    @Override
    public void update() {
        // NA/
    }

    @Override
    public int getCollisionRadius() {
        return 0;
    }
}

我正在尝试为游戏创建像狙击手的图像，但它不允许我这样做。它的显示方式：

即使我移动鼠标时我也希望它看起来像：

Answer 1

您正在做的就是告诉您想要真正称呼它的椭圆或椭圆左上角的java x和y位置。基本Java没有中心翻译功能，您需要自己计算椭圆的width / 2和height / 2。

Answer 2

替换

g2.drawOval((int)location.x - SIZE,(int)location.y - SIZE,(int)location.x-SIZE,(int)location.y - SIZE);

with

g2.drawOval((int)location.x - SIZE,(int)location.y - SIZE,SIZE,SIZE);