week03

複習上周 用滑鼠畫畫
void setup(){
  size(600,400);
}
void draw(){
      line(mouseX,mouseY,pmouseX,pmouseY);
}





按住滑鼠左鍵畫畫
void setup(){
  size(600,400);
}
void draw(){
   if(mousePressed&&mouseButton==LEFT)
  {
      line(mouseX,mouseY,pmouseX,pmouseY);
  }

}


按1 2 3改畫筆顏色 4 5改畫筆粗細
void setup(){
  size(600,400);
}
void draw(){
  if(key=='1') stroke(255,0,0);
  if(key=='2') stroke(255,255,0);
  if(key=='3') stroke(0,255,0);
  if(key=='4') strokeWeight(4);
  if(key=='5') strokeWeight(10);
  if(mousePressed&&mouseButton==LEFT)
   {
     line(mouseX,mouseY,pmouseX,pmouseY);
   }
  }

做一個小畫家程式
void setup(){
  size(600,400);
  fill(255,0,0); rect(0,0,50,50);
  fill(255,255,0); rect(0,50,50,50);
  fill(0,255,0); rect(0,100,50,50);
  fill(0,255,255); rect(0,150,50,50);
  fill(0,0,255); rect(0,200,50,50);
  line(25, 250, 25-7, 400);
  line(25, 250, 25+7, 400);
}
void draw(){
  if(mouseX<50 && mousePressed){
    if(mouseY<50) stroke(255,0,0);
    else if(mouseY<100) stroke(255,255,0);
    else if(mouseY<150) stroke(0,255,0);
    else if(mouseY<200) stroke(0,255,255);
    else if(mouseY<250) stroke(0,0,255);
    else{
      strokeWeight((mouseY-250)/10);
    }
  }
  if(mouseX>50 && mousePressed)
  {
      line(pmouseX,pmouseY,mouseX,mouseY);
  }
}