上課內容為類似接金筆互動,先產生球並給y方向速度下落,之後產生兩個,用for和array產生多個球,加上if判斷調整vy方向,碰撞判斷和boolean的true和false值,陣列變數和大小,random隨機亂數,class物件導向,加速度,特訓99
1.產生圓並按一定速度落下
在x,y位置產生圓並給速度vy
float x=250,y=0,vx=0,vy=3;
void setup(){
size(500,600);
}
void draw(){
background(255);
ellipse(x,y,50,50);
//y++;
//y=y+3;
y=y+vy;//vy是速度
}
增加x2,y2,vx2,vy2變數,有兩個球出現
float x=250,y=0,vx=0,vy=3;
float x2=150,y2=50,vx2=0,vy2=2;
void setup(){
size(500,600);
}
void draw(){
background(255);
ellipse(x,y,50,50);
ellipse(x2,y2,50,50);
y=y+vy;
y2=y2+vy2;
}
陣列產生多個值
float []x={250,150,350,300};
float []y={0,50,80,100};
float []vx={0,0,0,0};
float []vy={3,2,2.5,4};
void setup(){
size(500,600);
}
void draw(){
background(255);
for(int i=0;i<4;i++){
ellipse(x[i],y[i],50,50);
y[i]=y[i]+vy[i];
}
}
只能在y為0-600的範圍移動
if(y[i]>600) vy[i]=-vy[i];//碰到下方
if(y[i]<0) vy[i]=-vy[i];//接到上方
用dist距離判斷是否碰撞
float []x={250,150,350,300};
float []y={0,50,80,100};
float []vx={0,0,0,0};
float []vy={3,2,2.5,4};
void setup(){
size(500,600);
}
void draw(){
background(255);
for(int i=0;i<4;i++){
fill(255,255,0); ellipse(x[i],y[i],50,50);
if(dist(mouseX,mouseY,x[i],y[i])<=50){//判斷碰撞
continue;
}
y[i]=y[i]+vy[i];
if(y[i]>600) vy[i]=-vy[i];//碰到下方
if(y[i]<0) vy[i]=-vy[i];//接到上方
}
fill(255,0,0); ellipse(mouseX,mouseY,50,50);
}
用boolean的false和true值調整球的存活狀態
float []x={250,150,350,300};
float []y={0,50,80,100};
float []vx={0,0,0,0};
float []vy={3,2,2.5,4};
boolean []dead={false,false,false,false,false};//false=0,true=1
void setup(){
size(500,600);
}
void draw(){
background(255);
for(int i=0;i<4;i++){
if(dist(mouseX,mouseY,x[i],y[i])<=50){//判斷碰撞
dead[i]=true;//碰到就沒了
}
if(dead[i]==true) continue;//死了換下一個
fill(255,255,0); ellipse(x[i],y[i],50,50);//沒死畫它
y[i]=y[i]+vy[i];
if(y[i]>600) vy[i]=-vy[i];//碰到下方
if(y[i]<0) vy[i]=-vy[i];//接到上方
}
fill(255,0,0); ellipse(mouseX,mouseY,50,50);
}
boolean的false為不成立,true為成立
boolean down=true;//按下
void setup(){
size(500,300);
}
void draw(){
if(mousePressed) down=true;
else down=false;
print(down);
if(down) background(255,0,0);//紅色
else background(0,255,0);//綠色
}
產生更多球和隨即生成亂數
9.class物件導向
float []x;//宣告陣列變數
float []y;
float []vy;
boolean []dead;
int N=20;
void setup(){
size(500,600);
x=new float[N];//決定陣列大小
y=new float[N];
vy=new float[N];
dead=new boolean[N];
for(int i=0;i<N;i++){
x[i]=random(500);//500以下亂數
y[i]=random(100,200);
vy[i]=random(3,4);//3,4中間亂數
dead[i]=false;//沒有死掉
}
}
void draw(){
background(255);
for(int i=0;i<N;i++){
if(dist(mouseX,mouseY,x[i],y[i])<=50){//判斷碰撞
dead[i]=true;//碰到就沒了
}
if(dead[i]==true) continue;//死了換下一個
fill(255,255,0); ellipse(x[i],y[i],50,50);//沒死畫它
y[i]=y[i]+vy[i];
if(y[i]>600) vy[i]=-vy[i];//碰到下方
if(y[i]<0) vy[i]=-vy[i];//接到上方
}
fill(255,0,0); ellipse(mouseX,mouseY,50,50);
}
主程式碼更短
class Ball{//發明Ball物件
float x,y,vx,vy;
boolean dead;
Ball(){//建構同名
x=random(500);
y=random(100,200);
vy=random(3,4);
dead=false;
}
void draw(){
if(dead==true) return;//離開函式
ellipse(x,y,50,50);
if(dist(mouseX,mouseY,x,y)<50){
dead=true;
}
y=y+vy;
if(y>500) vy=-vy;
if(y<0) vy=-vy;
}
}
Ball []balls;
void setup(){
size(500,500);
balls=new Ball[20];
for(int i=0;i<20;i++){
balls[i]=new Ball();
}
}
void draw(){
background(255);
for(int i=0;i<20;i++){
balls[i].draw();
}
}
10.加入vx變數
增加x方向的速度
class Ball{//發明Ball物件
float x,y,vx,vy;
boolean dead;
Ball(){//建構同名
x=random(500);
y=random(500);
vy=random(-4,4);
vx=random(-4,4);
dead=false;
}
void draw(){
if(dead==true) return;
ellipse(x,y,50,50);
if(dist(mouseX,mouseY,x,y)<50){
dead=true;
}
x=x+vx;
y=y+vy;
if(y>500 || y<0) vy=-vy;
if(x>500 || x<0) vx=-vx;
}
}
vy+=0.98;
12.特訓99
用以下程式碼做出簡單的特訓99游戲
class Ball{//發明Ball物件
float x,y,vx,vy;
boolean dead;
Ball(){//建構同名
reborn();
}
void reborn(){
x=random(500);
y=random(500);
vy=random(-2,2);
vx=random(-2,2);
dead=false;
}
void draw(){
if(dead==true) return;
fill(255,0,0); ellipse(x,y,5,5);
if(dist(mouseX,mouseY,x,y)<5){
dead=true;
gameOver=true;
}
x=x+vx;
y=y+vy;
if(y>500 || y<0) reborn();
if(x>500 || x<0) reborn();
}
}
Ball []balls;
void setup(){
size(500,500);
balls=new Ball[99];
for(int i=0;i<99;i++){
balls[i]=new Ball();
}
}
boolean gameOver=false;
void draw(){
background(0);
for(int i=0;i<99;i++){
balls[i].draw();
}
if(gameOver) background(255,0,0);
}
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