week02

 背景顏色、線的顏色、填入顏色

1.背景顏色background(顏色號);

2.線的顏色stroke(顏色號);

3.填入顏色fill(顏色號);

做一個按住會變色的程式

程式碼:

void setup(){

  size(500,500);

}

void draw(){

  if(mousePressed)background(255,0,255);

  else background(0,255,0);

}

做一個用滑鼠畫線的程式

程式碼:

void setup(){

  size(500,500);

}

void draw(){

  if(mousePressed)line(mouseX,mouseY,pmouseX,pmouseY);

    //mouseX,mouseY:現在的鼠標位置

      pmouseX,pmouseY:上一個鼠標位置

}

加上調色盤

程式碼:

void setup(){

  size(500,500);

}

void draw(){

  fill(#ff0000);rect(0,0,100,100);

  fill(#ffff00);rect(0,100,100,100);

  fill(#00ff00);rect(0,200,100,100);

  fill(#0000ff);rect(0,300,100,100);

  fill(#ff00ff);rect(0,400,100,100);

  if(mousePressed && mouseX<100){

  if(mouseY<100)stroke(#ff0000);

  else if(mouseY<200)stroke(#ffff00);

  else if(mouseY<300)stroke(#00ff00);

  else if(mouseY<400)stroke(#0000ff);

  else if(mouseY<500)stroke(#ff00ff);

}

  else if(mousePressed && mouseX>100)line(mouseX,mouseY,pmouseX,pmouseY);

}

strokeWeight(number)更改線的粗度

void keyPressed(){

  save("yes.png");

}

按鍵事件:儲存