鼠标响应： mouseX, mouseY 鼠标的坐标

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void setup(){  size(300,300);  smooth();  background(200);}void draw(){  fill(255,255,0);  rectMode(CENTER);  rect(mouseX,mouseY,50,50);}

随着鼠标的移动画方块

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dist(x1,y1,x2,y2) 计算两点之间的距离

void setup(){  size(300,300);  smooth();}void draw(){  background(200);  stroke(0);  float d = dist(mouseX, mouseY,150,150);  strokeWeight(d/15);  fill(255);  ellipse(150,150,d*2,d);  strokeWeight(d/20);  fill(255,200,0);  ellipse(150,150,d,d);  fill(0);  noStroke();  ellipse(150,150,d/3,d/3);}

眼睛的大小会随着鼠标位置改变

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pmouseX,pmouseY: 鼠标的上一个坐标点

void setup(){  size(300,300);  strokeWeight(5);  smooth();  stroke(255,0,80,100);  background(0);}void draw(){  line(mouseX,mouseY,pmouseX,pmouseY);}

画出鼠标的轨迹

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鼠标响应事件

void mousePressed(){} 等价于 void draw(){if(mousePressed){}}

void mouseMoved(){}

void mouseDragged(){}

void setup(){  size(600,300);  smooth();  background(125,0,255,100);}void draw(){  if(mousePressed)  {    stroke(0);    fill(255,255,0);    ellipse(mouseX,mouseY,25,25);  }}

鼠标按下时画圆，一直按着不放就一直画圆 不要边框后更好看些

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void setup(){  size(300,300);  smooth();  background(125,0,255,100);}void draw(){}void mouseMoved(){  stroke(255,255,0,100);  rectMode(CENTER);  fill(255,255,0,50);  rect(mouseX,mouseY,50,50);}void mouseDragged(){  stroke(255,200,0,100);  fill(255,100,0,50);  ellipse(mouseX,mouseY,50,50);}

鼠标移动画方，鼠标拖动画圆

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mouseButton  含 LEFT, RIGHT, CENTER

void setup(){  size(300,300);  smooth();  background(204);  rectMode(CENTER);}void draw(){  if(mousePressed)  {    if(mouseButton == LEFT)    {      fill(255);    }    else if(mouseButton==CENTER)    {      fill(0);    }    else    {      fill(100);    }    rect(mouseX,mouseY,50,50);  }}

按下鼠标不同键颜色不同

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键盘响应：

keyPressed 按键响应 void keyPressed(){} 或 void draw(){if(keyPressed){}}

key 特定键响应 在keyPressed基础上加 if(key == 'a')

keyCode 功能键响应 包括 ALT, CONTROL, SHIFT,UP,DOWN,LEFT,RIGHT

int x = 150;int y = 150;void setup(){  size(300,300);  smooth();  background(204);  rectMode(CENTER);}void draw(){  if(keyPressed && (key == CODED))  {    if(keyCode == LEFT)    {      x--;    }    else if(keyCode == RIGHT)    {      x++;    }    else if(keyCode == UP)    {      y--;    }    else if(keyCode == DOWN)    {      y++;    }  }  ellipse(x,y,50,50);}

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随机：random(10) 生成0-10的任意浮点数

        int(random(6,10)), 生成6 7 8 9中任意一个数

void setup(){  size(300,300);  smooth();  background(255);  stroke(0,120);  colorMode(HSB,360,100,100);}void draw(){  float d = random(50);  fill(random(360),100,100,100);  ellipse(random(300),random(300),d,d);}

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限制 constrain(value,min,max); 限制value值在min-max范围内

int x = 150;int y = 150;void setup(){  size(300,300);  smooth();}void draw(){  background(127);  fill(255);  rect(50,50,200,200);  fill(127);  rect(100,100,100,100);  float mx = constrain(mouseX,70,230);  float my = constrain(mouseY,70,230);   fill(0);  ellipse(mx,my,40,40);}