請原諒我的天真,這是我第一次在這裏,第一次處理java中圖形的動畫。我試圖完成沿着某種弧線移動的星形形狀的動畫(試圖模擬2d明智的軌道)。軌道動作與定時器一起使用來爲星星製作動畫。沿着帶有Java圖形的弧形路徑移動形狀
簡而言之,我在jpanel的不同位置畫了幾顆星。星星y位置的平移取決於該星星離初始化爲300(jpanel中心)的x軸下降的距離。恆星越接近衰落點,它們的y位置就會發生改變。當一顆恆星到達或通過面板的右側(或者看不見)時,在原來的y位置重置到左側(醜陋,我知道)。我選擇這樣做,因爲星星是隨機放置的。我不能讓所有的恆星都以相同的鏑開始,如果真的如此,所有恆星都會沿着它們自己的弧移動。
但是,當我運行這個,第三遍後,所有恆星的x位置變得更小(進入負範圍和超出視野)。歡迎任何關於完成原始任務的更好方法的建議。謝謝。
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]);
}
}
}
歡迎SO!爲了更快地獲得更好的幫助,請發佈[SSCCE](http://sscce.org/)。 – 2012-02-11 05:41:13