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我寫了一個程序,其中一個UFO(實質上是一個灰色橢圓)從屏幕中心出現並飛向邊緣。當按下鼠標時會出現激光,並在釋放鼠標時消失。我想做的是當鼠標點擊/激光觸摸它時UFO消失。 我已經制作了UFO類,並創建了確定其移動和速度的變量,並且我能夠讓激光直接出現在光標上。我想過做一個'if'語句來檢查光標是否在UFO的半徑(或直徑)內,並將它放在我爲UFO創建的for循環中。但是,我不確定如何實現正確的語法來實現它。 注意:播放草圖後,您可能需要等待幾秒鐘才能顯示第一個圓。製作一個移動的圓被點擊後消失,處理
UFO[] ufos = new UFO[3];
void setup() {
size(700, 700);
for (int j = 0; j < ufos.length; j++) {
ufos[j] = new UFO();
}
}
//UFO class
//Class setup ends on line 61
class UFO {
float a;
float b;
float c;
float sa;
float sb;
float d;
UFO() {
//declare float a/b/c value
a = random(-width/2, width/2);
b = random(-height/2, width/2);
c = random(width);
}
//UFO movement
void update() {
//float c will serve as a speed determinant of UFOs
c = c - 1;
if (c < 5) {
c = width;
}
}
//UFO setup
void show() {
//moving x/y coordinates of UFO
float sa = map(a/c, 0, 1, 0, width);
float sb = map(b/c, 0, 1, 0, height);
float d = map(c, 0, width, 50, 0);
//UFO drawing shapes
//ellipse is always sa (or sb)/c to allow UFO to appear
//as if it is moving through space
fill(200);
ellipse((sa/c), (sb/c), d + 5, d+5);
//Hides UFO way off the screen
//and replaces it with a black-filled ellipse until
//it forms into a full circle
//When radius d becomes 50, the UFO flies from the
//center of the screen to off of the screen
if (d < 50) {
fill(0);
ellipse(-5, -10, 90, 90);
sa = 10000;
sb = 10000;
}
}
}
void draw() {
//Background
background(0);
//Translated the screen so that the UFOs appear to fly from
//the center of the screen
translate(width/2, height/2);
//UFO draw loop, make UFO visible on screen
for (int j = 0; j < ufos.length; j++) {
ufos[j].update();
ufos[j].show();
//mouse-click laser
if (mousePressed == true) {
fill(200,0,0);
ellipse(mouseX - 352,mouseY - 347,50,50);
}
}
}
請鏈接crossposts:http://forum.happycoding.io/t/make-a-moving-circle-disappear-when-clicked-on/47 它看起來像你刪除了我回答的問題這已經在堆棧溢出。那個問題去了哪裏? –