基本上我只想要一些关于如何使圆圈从可移动物体上反弹的指导。我遇到麻烦,已经尝试了三个小时,因此转向论坛寻求帮助。我尝试了多个'if'语句,但很明显我没有正确理解,因为没有一个正在工作。谢谢 :)
我已经尝试了3个小时用不同的if语句来解决这个问题。
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;
}
}
将任何变量插入if语句并仅接收回:球被我的鼠标光标(不是对象),毛刺的圆圈和stuttery图像反弹。
必须检查球的x坐标是否在对象的范围内(objW
是对象的宽度):
circle_x > x && circle_x < x + objW
如果球的y坐标已达到物体的高度(objH
是物体的高度,circleR
是球的半径):
circle_y > objH - circleR
此外,重要的是首先进行命中测试并在物体反弹后进行测试。一个好的风格是在else if
声明中这样做:
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,我建议首先计算球的位置,然后在当前位置绘制球:
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);
}