这是Planet类:
public class Planet extends CelestialBody {
private static Random r = new Random();
private static Star star;
public Planet(Star star, int orbitRadius, int x, int y){
name = "PLACEHOLDER";
radius = Tools.intBetween(Settings.MAX_PLANET_SIZE, Settings.MIN_PLANET_SIZE);
color = Tools.rObjFromArray(Settings.PLANET_COLORS);
this.star = star;
this.orbitRadius = orbitRadius;
this.x = x; this.y = y;
}
public static Planet createNewPlanet(Star star, int orbitRadius){
int px = (int) (star.x + orbitRadius * Math.cos(Math.toRadians(r.nextInt(360))));
int py = (int) (star.y + orbitRadius * Math.sin(Math.toRadians(r.nextInt(360))));
return new Planet(star, orbitRadius, px, py);
}
public void render(Graphics g){
//Draw orbit
g.setColor(Color.white);
g.drawOval(star.x - orbitRadius, star.y - orbitRadius, orbitRadius * 2, orbitRadius * 2);
//Draw planet
g.setColor(color);
g.fillOval(x - radius, y - radius, radius * 2, radius * 2);
}
}
orbitRadius = distance from planet to star (random);
radius = planet's radius (random)
在评论中询问您是否需要更多代码,我知道这是一个noob问题,但我无法弄清楚为什么轨道不与行星对齐。感谢。
答案 0 :(得分:2)
问题在于以下两行:
int px = (int) (star.x + orbitRadius * Math.cos(Math.toRadians(r.nextInt(360))));
int py = (int) (star.y + orbitRadius * Math.sin(Math.toRadians(r.nextInt(360))));
因为您分别拨打r.nextInt(360)
两次,所以每次都会得到一个不同的随机数。
结果是x和y坐标是针对不同角度的,我认为很清楚为什么这会是一个问题。
解决方案非常简单:只需调用r.nextInt
一次并保存结果:
double randomAngle = Math.toRadians(r.nextInt(360));
int px = (int) (star.x + orbitRadius * Math.cos(randomAngle));
int py = (int) (star.y + orbitRadius * Math.sin(randomAngle));
我认为这应该可以解决问题。