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最近我一直在使用多邊形類來創建小行星以及子彈和飛船。我目前正在嘗試爲程序創建碰撞檢測,但似乎碰撞檢測只能在1/5左右的時間內工作(沒有出現任何模式表明它爲什麼工作)。的Java 2D多邊形 - 多邊形碰撞檢測
下面的代碼.. 創建多邊形:
void renderPoly() {
int j;
int s = sides;
double r, angle;
int x, y;
for (j = 0; j < s; j++) {
angle = 2 * Math.PI/s * j;
r = MIN_ROCK_SIZE + (int) (Math.random() * (MAX_ROCK_SIZE - MIN_ROCK_SIZE));
x = (int) (r * Math.cos(angle));
y = (int) (r * -Math.sin(angle));
cOM[0] += x;
cOM[1] += y;
pointData[j][0] = x;
pointData[j][1] = y;
}
cOM[0] /= asteroidShape.npoints;
cOM[1] /= asteroidShape.npoints;
for (int i = 0; i < asteroidShape.npoints; i++) {
pointData[i][0] += cOM[0];
pointData[i][1] += cOM[1];
}
}
旋轉和移動的多邊形:
void move() {
int x, y, i;
//change rotation
theta += rotVel;
//change x
asteroidData[0] += deltaX;
//change y
asteroidData[1] += deltaY;
for (i = 0; i < asteroidShape.npoints; i++) {
x = (int) (pointData[i][0] * Math.cos(theta) - pointData[i][1] * Math.sin(theta));
y = (int) (pointData[i][0] * Math.sin(theta) + pointData[i][1] * Math.cos(theta));
asteroidShape.xpoints[i] = x + asteroidData[0];
asteroidShape.ypoints[i] = y + asteroidData[1];
asteroidShape.invalidate();
}
}
檢查,如果感人子彈:
boolean hitBullet(Bullet b) {
this.asteroidShape.invalidate();
for (int i = 0; i < b.bulletShape.npoints; i++)
if (this.asteroidShape.contains(b.bulletShape.xpoints[i], b.bulletShape.ypoints[i]))
return true;
for (int j = 0; j < this.asteroidShape.npoints; j++)
if (b.bulletShape.contains(this.asteroidShape.xpoints[j], this.asteroidShape.ypoints[j]))
return true;
return false;
}
(船方法是相同的,除了構造函數需要一個船對象)
以及調用它的「遊戲」類環:
for (int i = 0; i < aArray.length-1; i++) {
if (aArray[i] != null) {
for (int j = 0; j < bArray.length-1; j++) {
if (bArray[j] != null) {
if (aArray[i].hitBullet(bArray[j])) {
aArray[i] = null;
bArray[j] = null;
i = aArray.length-1;
j = bArray.length-1;
}
}
else {
i = aArray.length-1;
j = bArray.length-1;
}
}
}
else {
i = aArray.length-1;
}
}
我已經在替代解決方案,比如分離軸定理一直在尋找周圍然而,我在次,並自具有凸多邊形這個方法(.contains())已經存在了,我想用它。
任何幫助將不勝感激,謝謝!
根據該文件的Area.intersect(區)有兩個方面,並提出它們放在一起。它不檢查它們是否相交。 Area.intersects()方法需要一個2D矩形,而不是另一個區域。所以這與Polygon類相同。 我也用區域替換了多邊形,並繼續使用.contains但它具有山姆效應 – user3057800
同樣,這也不起作用.. 'Area asteroid = new Area(asteroidShape); if(asteroid.intersects(c.pgn.getBounds2D())) return true;' – user3057800
if(area1.intersect(area2).equals(new Area())這意味着兩個形狀沒有碰撞(有沒有共同的區域) – ControlAltDel