week02課程

 1.1點擊換色

void setup(){

  size(500,500);

}

void draw(){

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

  else background(0,255,0);

}

1.2點擊或拖曳可畫線

void draw(){

  if(mousePressed)line(mouseX,mouseY,0,0);

}

1.3小畫家功能

void setup(){

  size(500,500);

  fill(255,0,0);rect(0,0,100,100);//紅色方格

  fill(0,255,0);rect(0,100,100,100);//綠色方格

}

void draw(){

  if(mousePressed){

    if(mouseX<100){

      if(mouseY<100)stroke(255,0,0);

      else if(mouseY<200)stroke(0,255,0); 

    }else line(mouseX,mouseY,pmouseX,pmouseY);

  }

}

▲透過判斷來決定說線條的顏色

void setup(){

  size(500,500);

  for(int i=1; i<8; i++){

    rect(0,i*50,50,50);

    ellipse(25,25+i*50,i,i);

  }

}

void draw(){

  if(mousePressed){

    if(mouseX<100){

      for(int i=1;i<8;i++){

       if(mouseY>i*50 && mouseY<i*50+50){

         strokeWeight(i);

       }

      } 

    }else line(mouseX,mouseY,pmouseX,pmouseY);

  }

}

▲可以畫出指定的顏色