step01
正在跑的球
```java
void setup()
{
size(500,500);
}
int x=250,y=250;//變數(位置)
void draw()
{
ellipse(x,y,10,10);//橢圓
x=x+1;
y=y-1;
}
```
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會反彈的球
```java
void setup()
{
size(500,500);
}
float x=250,y=250;//變數(位置)精細
float vx=1.0,vy=-0.5;
void draw()
{
ellipse(x,y,10,10);//橢圓
x=x+vx;
y=y+vy;
if(x>500) vx=-vx;
if(y<0) vy=-vy;
}
```
.png)
用板子反彈
```java
void setup()
{
size(500,500);
}
float x=250,y=250;//變數(位置)精細
float vx=2.0,vy=-1.5;
void draw()
{
background(#FF2929);//背景，去殘影
int boardX=mouseX;
rect(boardX,470,100,20);//控制的板子
ellipse(x,y,10,10);//橢圓
x=x+vx;
y=y+vy;
if(x>500) vx=-vx;
if(y<0) vy=-vy;
if(x<0) vx=-vx;
if(y>470 && x>boardX && x<boardX+100) vy=-vy;
}
```
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step02
打球遊戲
```java
void setup()
{
size(500,500);
}
float x=250,y=250;//變數(位置)精細
float vx=2.0,vy=-1.5;
float boardX,boardY=470,boardW=100,boardH=20;
void draw()
{
boardX=mouseX-boardW/2;
background(#FF2929);//背景，去殘影
rect(boardX,boardY,boardW,boardH);//控制的板子
ellipse(x,y,10,10);//橢圓
x=x+vx;
y=y+vy;
if(x>500) vx=-vx;
if(y<0) vy=-vy;
if(x<0) vx=-vx;
if((y>boardY && y<boardY+boardH) &&
(x>boardX && x<boardX+boardW))
{
vy=-vy;
vx+=(mouseX-pmouseX)/2;//mouse的移動速度
}
if(mousePressed && mouseButton==LEFT) boardW*=1.01;
if(mousePressed && mouseButton==RIGHT) boardW*=0.99;
}
```
.png)
九路圍棋
```java
void setup()
{
size(500,500);
}
void draw()
{
//用迴圈畫棋
for(int x=50;x<=450;x+=50)
{
for(int y=50;y<=450;y+=50)
{
ellipse(x,y,50,50);
}
}
}
```
.png)
陣列圍棋
```java
void setup()
{
size(500,500);
}
int [][] go=
{
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,1,0,0,0,1,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,1,0,0,0,1,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0}
};//陣列9x9
void draw()//用迴圈畫棋
{
for(int i=0;i<9;i++) //i對應y座標
{
for(int j=0;j<9;j++) //j對應x座標
{
if(go[i][j]==1) fill(0);
else fill(255);
ellipse(50+j*50,50+i*50,50,50);
}
}
}
```
.png)
step03
加上棋盤
```java
void setup()
{
size(500,500);
}
int [][] go=
{
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,1,0,0,0,2,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,1,0,0,0,2,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0}
};//陣列9x9
void draw()//用迴圈畫棋
{
background(246,194,108);//木頭色棋盤
for(int i=1;i<=9;i++)//用迴圈畫線
{
line(50,50*i,450,50*i);
line(50*i,50,50*i,450);
}
for(int i=0;i<9;i++) //i對應y座標
{
for(int j=0;j<9;j++) //j對應x座標
{
if(go[i][j]==1)//1是黑棋
{
fill(0);
ellipse(50+j*50,50+i*50,40,40);
}
else if(go[i][j]==2)//2是白棋
{
fill(255);
ellipse(50+j*50,50+i*50,40,40);
}
}
}
}
```
.png)
簡易打棋譜
```java
void setup()
{
size(500,500);
}
int [][] go=
{
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0}
};//陣列9x9
int n=0;//目前棋子數
void mousePressed()
{
int j=(mouseX-25)/50;//j對應x座標
int i=(mouseY-25)/50;//i對應y座標
go[i][j]=(n%2==0)?1:2;//if(n%2==0)用1，否則2
n++;//多一顆棋
}
void draw()//用迴圈畫棋
{
background(246,194,108);//木頭色棋盤
for(int i=1;i<=9;i++)//用迴圈畫線
{
line(50,50*i,450,50*i);
line(50*i,50,50*i,450);
}
for(int i=0;i<9;i++) //i對應y座標
{
for(int j=0;j<9;j++) //j對應x座標
{
if(go[i][j]==1)//1是黑棋
{
fill(0);
ellipse(50+j*50,50+i*50,40,40);
}
else if(go[i][j]==2)//2是白棋
{
fill(255);
ellipse(50+j*50,50+i*50,40,40);
}
}
}
}
```
.png)
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