<分区>
所以我正在尝试制作一个简单的台球模拟，并且在尝试检查球之间的碰撞时，我的 bounce 函数在循环中被跳过。控制台上应该显示 PoolTable.cpp 文件中函数 bounce 中的随机字母，但它被跳过并且不处理命中或输出文本到控制台。不确定为什么它不运行该功能。没有警告。没有错误。编译得很好。我在 Windows 机器上，使用代码块和 GLUT 库/项目。
演练
所以我用构造函数初始化并放置球。然后我使用 drawBalls 函数在屏幕上绘制球。绘制球后，我更新它们的位置并使用 moveBalls 函数移动它们。移动完每个球后，仍然在 moveball 函数中，我使用 checkCollisions 函数检查碰撞。 checkCollisions 然后启动两个 for 循环，但从不运行弹跳函数，因为球不会彼此弹开，并且 cout 不会打印在终端中。由于某种原因，它被跳过了。
PoolTable.cpp
#include "PoolTable.h"
#include "poolball.h"
#include "Graphics.h"
#include <iostream>
using namespace std;
#include <cmath>
PoolTable::PoolTable( int x){
placeBalls( x );
}
void PoolTable::placeBalls( int x ){
number_of_balls = x;
for( int i = 0; i < x; i++){
balls[i].setX( balls[i].getRadius() + i * 20 );
balls[i].setY( balls[i].getRadius() + i * 30 );
}
}
double find_angle(double vx, double vy) {
// determine the angle between poolballs when they collide
double t; double PI = acos(-1.0);
if(vx < 0) // vertical collision
t = PI + atan(vy/vx);
else if(vx > 0.0 && vy >= 0.0) // 1st quardant collision
t = atan(vy/vx);
else if(vx > 0.0 && vy < 0.0) //
t = 2.0*PI + atan(vy/vx);
else if( vx == 0.0 && vy == 0.0)
t = 0.0;
else if(vx == 0 && vy >= 0.0)
t = PI/2.0;
else
t = 1.5 * PI;
return t;
}
void PoolTable::bounce(int i, int j) {
cout << "klasdjflkadsjflkasjfsadk" << endl;
double PI = acos(-1.0);
double x1 = balls[i].getX();
double y1 = balls[i].getY();
double x2 = balls[j].getX();
double y2 = balls[j].getY();
double dx = x2 - x1;
double dy = y2 - y1;
double dist = sqrt(dx*dx+dy*dy);
// did a collision occur
if(dist <= 2 * balls[i].getRadius()) {
double phi; // angle between the two ball centers
if(dx == 0.0)
phi = PI/2.0;
else
phi = atan2 (dy, dx);
// now compute the total velocities of the two balls
double vx1 = balls[i].xSpeed;
double vy1 = balls[i].getYSpeed();
double v1total = sqrt(vx1*vx1 + vy1*vy1);
double vx2 = balls[j].getXSpeed();
double vy2 = balls[j].getYSpeed();
double v2total = sqrt(vx2*vx2 + vy2*vy2);
// find the angle of each ball's velocity
double ang1 = find_angle(vx1,vy1);
double ang2 = find_angle(vx2,vy2);
// transform velocities into normal.tangential components
double v1xr = v1total * cos(ang1 - phi);
double v1yr = v1total * sin(ang1 - phi);
double v2xr = v2total * cos(ang2 - phi);
double v2yr = v2total * sin(ang2 - phi);
// now find the final velocities (assuming equal mass)
double v1fxr = v2xr;
double v2fxr = v1xr;
double v1fyr = v1yr;
double v2fyr = v2yr;
// reset the velocities
balls[i].setXSpeed(cos(phi)*v1fxr + cos(phi+PI/2)*v1fyr);
balls[i].setYSpeed(sin(phi)*v1fxr + sin(phi+PI/2)*v1fyr);
balls[j].setXSpeed(cos(phi)*v2fxr + cos(phi+PI/2)*v2fyr);
balls[j].setYSpeed(sin(phi)*v2fxr + sin(phi+PI/2)*v2fyr);
}
}
void PoolTable::checkCollisions(void){
for( int i = 0; i < number_of_balls; i++){
for( int j = i + 1; j < number_of_balls; j++){
bounce(i, j);
}
}
}
void PoolTable::moveBalls(void){
for( int i = 0; i < number_of_balls; i++){
balls[i].move();
void checkCollisions();
}
}
void PoolTable::drawBalls(void){
for( int i = 0; i < number_of_balls; i++){
balls[i].draw();
}
}