请原谅我的天真,这是我第一次在这里,第一次处理java中图形的动画。我试图完成沿着某种弧线移动的星形形状的动画(试图模拟2d明智的轨道)。轨道动作与定时器一起使用来为星星制作动画。沿着带有Java图形的弧形路径移动形状
简而言之,我在jpanel的不同位置画了几颗星。星星y位置的平移取决于该星星离初始化为300(jpanel中心)的x轴下降的距离。恒星越接近衰落点,它们的y位置就会发生改变。当一颗恒星到达或通过面板的右侧(或者看不见)时,在原来的y位置重置到左侧(丑陋,我知道)。我选择这样做,因为星星是随机放置的。我不能让所有的恒星都以相同的镝开始,如果真的如此,所有恒星都会沿着它们自己的弧移动。
但是,当我运行这个,第三遍后,所有恒星的x位置变得更小(进入负范围和超出视野)。欢迎任何关于完成原始任务的更好方法的建议。谢谢。
private Action orbit = new AbstractAction() {
int declineAxis = 300; //if a stars top left x is greater than this, move downwards
double distFromDecline;
AffineTransform at = new AffineTransform();
@Override
public void actionPerformed(ActionEvent ae) {
for (int i = 0; i < 12; i++) {
distFromDecline = Math.abs(declineAxis - stars.getStar(i).getBounds().getCenterX());
if (distFromDecline <= 50) {
if (stars.getStar(i).getBounds().getX() < declineAxis) {
at.translate(5, -2);
} else {
at.translate(5, 2);
}
} else if (distFromDecline <= 100 && distFromDecline > 50) {
if (stars.getStar(i).getBounds().getX() < declineAxis) {
at.translate(5, -3);
} else {
at.translate(5, 3);
}
} else if (distFromDecline <= 200 && distFromDecline > 100) {
if (stars.getStar(i).getBounds().getX() < declineAxis) {
at.translate(5, -4);
} else {
at.translate(5, 4);
}
} else if (distFromDecline >200) {
if (stars.getStar(i).getBounds().getX() < declineAxis) {
at.translate(5, -5);
} else {
at.translate(5, 5);
}
}
stars.move(at, i);
}
}
};
public class Stars {
private int[] yOrigins;
private Path2D[] stars;
private Random rand = new Random();
public Stars(int n) {
stars = new Path2D[n];
yOrigins = new int[n];
int dx = 700/n;
int x = 0;
for (int i = 0; i < n; i++) {
int y = rand.nextInt(401);
generateStar(i, x, y);
yOrigins[i] = y;
x += dx;
}
}
private void generateStar(int i, int x, int y) {
stars[i] = new Path2D.Double();
Path2D.Double cur = (Path2D.Double) stars[i];
cur.moveTo(x, y);
cur.lineTo(cur.getCurrentPoint().getX() + 6, y - 2);
cur.lineTo(cur.getCurrentPoint().getX() + 2, cur.getCurrentPoint().getY() - 6);
cur.lineTo(cur.getCurrentPoint().getX() + 2, cur.getCurrentPoint().getY() + 6);
cur.lineTo(cur.getCurrentPoint().getX() + 6, cur.getCurrentPoint().getY() + 2);
cur.lineTo(cur.getCurrentPoint().getX() - 6, cur.getCurrentPoint().getY() + 2);
cur.lineTo(cur.getCurrentPoint().getX() - 2, cur.getCurrentPoint().getY() + 6);
cur.lineTo(cur.getCurrentPoint().getX() - 2, cur.getCurrentPoint().getY() - 6);
cur.closePath();
}
public void paintStars(Graphics2D g) {
//super.paintComponent(g);
g.setColor(new Color(246, 246, 255));
for (int i = 0; i < stars.length; i++) {
g.fill(stars[i]);
}
}
public Shape getStar(int i) {
return stars[i];
}
void move(AffineTransform at, int i) {
stars[i] = (Path2D) stars[i].createTransformedShape(at);
System.out.println(i+": " + stars[i].getBounds());
if(stars[i].getBounds().getX()>700){
at.translate(-(stars[i].getBounds().x+stars[i].getBounds().getWidth()), yOrigins[i]);
stars[i] = (Path2D) at.createTransformedShape(stars[i]);
}
}
}
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