processing学习笔记2--弹球游戏1.0


      上次那个球体碰撞的代码，实质上就构建了一个 圆球类（不是太完善，现在觉得还是 不应该 用 angle 来作为 运动的 依据），现在 我用这个类 做了一个 简单的 弹球游戏，今晚只做到 1.0版，还没有加 球洞，下次假期有时间再加吧。总的来说，这个小游戏的核心 就是 hitcircle 的 使用方法。下次希望改善这个类 的运动依据，直接用 x,y的增减来控制 运动。最近刚看到一本书 叫《代码本色》，很不错，上面讲的很多东西 都超有趣。

int M=5;  //number of balls
float S=10;  //speed
int R=20;
int sizeX=800;
int sizeY=600;
Circle [] mycircle=new Circle[M+1];
Circle hitcircle;

void setup()
{
size(sizeX,sizeY);
smooth();
hitcircle=new Circle(100,300,0);
mycircle[0] =new Circle(600,300,1);
for(int i=1;i<=2;i++)
{
mycircle[i] =new Circle(640,240+i*40,1);
}
for(int i=3;i<=M;i++)
{
mycircle[i] =new Circle(680,220+(i-2)*40,1);
}
}

void draw()
{
background(0);
hitcircle.move();
hitcircle.judge();
hitcircle.display();
for(int i=0;i<=M;i++)
{
mycircle[i].move();
mycircle[i].judge();
mycircle[i].display();
}
if(mousePressed)
{
if(hitcircle.speed<=0)
{
hitcircle.speed=S;
float k;
k=asin((mouseY-hitcircle.y)/dist(mouseX,mouseY,hitcircle.x,hitcircle.y));
if(mouseX>hitcircle.x)
hitcircle.angle=k;
else
hitcircle.angle=PI-k;
}
}
}

class Circle
{
float x;
float y;
int r;
int c;
float speed;
float angle;
int flag;

Circle(float xx,float yy,int cc)
{
x=xx;
y=yy;
r=R;
c=cc;
speed=0;
angle=0;
}

void move()
{
if(speed>0)
{
x+=speed*cos(angle);
y+=speed*sin(angle);
}
speed=speed-0.05;
}

void judge()
{
if(y+r>=sizeY||y-r<=0)
angle=2*PI-angle;
if(x+r>=sizeX||x-r<=0)
angle=3*PI-angle;
for(int i = 0; i<=M; i++)
{
for(int j = 0; j<=M; j++)
{
if(i!=j)
{
if(dist(mycircle[i].x,mycircle[i].y,mycircle[j].x,mycircle[j].y)<=mycircle[i].r+mycircle[j].r)
{
float m;
m=atan((mycircle[i].y-mycircle[j].y)/(mycircle[i].x-mycircle[j].x));
mycircle[i].angle=PI-mycircle[i].angle-2*m;
mycircle[j].angle=PI-mycircle[j].angle-2*m;
mycircle[i].speed=((mycircle[i].speed>mycircle[j].speed)?mycircle[i].speed:mycircle[j].speed);
}
}
}
if(dist(mycircle[i].x,mycircle[i].y,hitcircle.x,hitcircle.y)<=mycircle[i].r+hitcircle.r)
{
float m;
m=atan((mycircle[i].y-hitcircle.y)/(mycircle[i].x-hitcircle.x));
mycircle[i].angle=PI-mycircle[i].angle-2*m;
hitcircle.angle=PI-hitcircle.angle-2*m;;
mycircle[i].speed=hitcircle.speed;
}
}
}

void display()
{
if(c==1)
fill(255,0,0);
else
fill(0,255,0);
ellipse(x,y,2*r,2*r);
}
}

    希望对刚开始学或者有同样想法的人有一定的帮助。也希望各位看官能给与建议。O(∩_∩)O