[英]Is there a way for me to make the circle bounce off the top of the movable object?
基本上我只想要一些關於如何使圓圈從可移動物體上反彈的指導。 我遇到麻煩,已經嘗試了三個小時,因此轉向論壇尋求幫助。 我嘗試了多個'if'語句,但很明顯我沒有正確理解,因為沒有一個正在工作。 謝謝 :)
我已經嘗試了3個小時用不同的if語句來解決這個問題。
float x;
float easing = 1;
float circle_x = 1;
float circle_y = 30;
float rad = 12.5;
float gravity = 0.98;
float move_x = 5;
float move_y = 5;
void setup() {
size(640, 480);
frameRate(60);
}
void draw() {
background(#87CEEB);
fill(#7cfc00);
rect(0, 430, 640, 80);
float targetX = mouseX;
float dx = targetX - x;
x += dx * easing;
fill(#000000);
rect(x, 400, 30, 30);
rect(x-20, 390, 70, 10);
rect(x, 430, 5, 20);
rect(x+25, 430, 5, 20);
ellipse(circle_x, circle_y, 25, 25);
circle_x = circle_x + move_x;
circle_y = circle_y + move_y;
if (circle_x > width) {
circle_x = width;
move_x = -move_x;
}
if (circle_y > height) {
circle_y = height;
move_y = -move_y;
}
if (circle_x < 0) {
circle_x = 0;
move_x = -move_x;
}
if (circle_y < 0) {
circle_y = 0;
move_y= -move_y;
}
}
將任何變量插入if語句並僅接收回:球被我的鼠標光標(不是對象),毛刺的圓圈和stuttery圖像反彈。
必須檢查球的x坐標是否在對象的范圍內( objW
是對象的寬度):
circle_x > x && circle_x < x + objW
如果球的y坐標已達到物體的高度( objH
是物體的高度,而circleR
是球的半徑):
circle_y > objH - circleR
此外,重要的是首先進行命中測試並在物體反彈后進行測試。 一個好的風格是在else if
語句中執行此操作:
int objX1 = -20;
int objX2 = 70;
int objH = 390;
int circleR = 25/2;
if (circle_x > x + objX1 && circle_x < x + objX2 && circle_y > objH - circleR ) {
circle_y = objH-circleR;
move_y = -move_y;
}
else if (circle_y > height) {
circle_y = height;
move_y = -move_y;
}
else if (circle_y < 0) {
circle_y = 0;
move_y= -move_y;
}
此外,我建議首先計算球的位置,然后在當前位置繪制球:
float x;
float easing = 1;
float circle_x = 1;
float circle_y = 30;
float rad = 12.5;
float gravity = 0.98;
float move_x = 5;
float move_y = 5;
void setup() {
size(640, 480);
frameRate(60);
}
void draw() {
background(#87CEEB);
fill(#7cfc00);
rect(0, 430, 640, 80);
float targetX = mouseX;
float dx = targetX - x;
x += dx * easing;
circle_x = circle_x + move_x;
circle_y = circle_y + move_y;
if (circle_x > width) {
circle_x = width;
move_x = -move_x;
}
else if (circle_x < 0) {
circle_x = 0;
move_x = -move_x;
}
int objW = 70;
int objH = 390;
int circleR = 25/2;
if (circle_x > x && circle_x < x + objW && circle_y > objH-circleR ) {
circle_y = objH-circleR;
move_y = -move_y;
}
else if (circle_y > height) {
circle_y = height;
move_y = -move_y;
}
else if (circle_y < 0) {
circle_y = 0;
move_y= -move_y;
}
fill(#000000);
rect(x, 400, 30, 30);
rect(x-20, 390, 70, 10);
rect(x, 430, 5, 20);
rect(x+25, 430, 5, 20);
ellipse(circle_x, circle_y, 25, 25);
}
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