Week14 快要放假了

 1.第一節上課

//week14_1_draw_lines_void_mouseDragged_mouseButton_LEFT_RIGHT

void setup(){

  size(500,500);

}

int x = -1,y =  -1;

void draw(){

  if(x!=-1 ){

    ellipse(x,y,1,1);

    y++;//往下滴(x,y)座標中,y慢慢變大,就是往下滴的感覺

  }

}

void mouseDragged(){//要用右鍵拖曳,才會滴下噁心的水滴

  if(mouseButton == LEFT)line(mouseX,mouseY,pmouseX,pmouseY);

  if(mouseButton == RIGHT){

    x = mouseX;

    y = mouseY;

  }

}

左鍵畫線右鍵滴水

//week14_2_draw_lines_loadPixels_pixels_updatePixels

void setup(){

  size(500,500);

  background(255);//背景設成白色

}

void draw(){

  //pixels

}

void mouseDragged(){

  if(mouseButton==LEFT){//在左鍵dragged拖曳時

     line(mouseX,mouseY,pmouseX,pmouseY);//本來的線,是灰黑色的,不是白色

     loadPixels();//取出畫面的像素

     //println(pixels[0]);//白色是-1 其實是color(255,255,255,255)

     for(int i=0;i < width*height;i++){//全部的點,都去巡一下色彩

       if(pixels[i] != -1)pixels[i] = color(random(255),random(255),random(255));

     }//如果不是白色就是有畫圖碰到的pixels,都變成亂數的彩色

     updatePixels();//若有修改,要再放回去

  }

}

//week14_3_draw_lines_rain_PImage_createImage_img_loadPixels_pixels_updatePixels

PImage img;

void setup(){

  size(500,500);

  img = createImage(500,500,RGB);

  img.loadPixels();

  for(int i=0;i<500*500;i++)img.pixels[i] = color(#FFFFF2);//-14

  img.updatePixels();

}

int x= 250,y=0;

void draw(){

  background(img);

  ellipse(x,y,20,20);

  if(y<498 && img.pixels[x+y*500]==-14)y++;

}

void mouseDragged(){

  background(img);

  line(mouseX,mouseY,pmouseX,pmouseY);

  loadPixels();

  img.loadPixels();

  for(int i =0;i<500*500;i++)img.pixels[i] = pixels[i];

  img.updatePixels();

  updatePixels();

}

2.第二節上課

//week14_04_draw_lines_rain_ArrayList_PVector_p_pp

PImage img;

void setup(){

  size(500,500);

  img = createImage(500,500,RGB);

}//換黑背景

ArrayList<PVector> p = new ArrayList<PVector>();

void draw(){

  background(img);

  //if(y<498 && img.pixels[x+y*500]==0)y++;

  for(PVector pp :p){

    ellipse(pp.x,pp.y,20,20);

    if(pp.y<498 && img.pixels[int(pp.x)+int(pp.y)*500]==-16777216)pp.y++;

    }

}

void mouseDragged(){

  background(img);

  stroke(random(255),random(255),random(255));

  line(mouseX,mouseY,pmouseX,pmouseY);

  loadPixels();

  img.loadPixels();

  for(int i =0;i<500*500;i++)img.pixels[i] = pixels[i];

  img.updatePixels();

  updatePixels();

  for(PVector pp: p){

    ellipse(pp.x,pp.y,20,20);

  }

}

void mousePressed(){

  if(mouseButton==RIGHT){

    p.add(new PVector(mouseX,mouseY));

  }

}

3.第三節上課

//week14_5_draw_lines_myFloodFill_x_y_c1_c2_pixels_isOK

void setup(){

  size(500,500);

  background(#FFFFF2);//先畫淡黃色背景

}

void draw(){

  if(mousePressed && mouseButton==LEFT)line(mouseX,mouseY,pmouseX,pmouseY);

  if(mousePressed && mouseButton==RIGHT){

    loadPixels();

    color c1 = pixels[mouseX+mouseY*500];

    color c2 = color(random(255),random(255),random(255));

    myFloodFill(mouseX,mouseY,c1,c2);

    updatePixels();

  }

}

boolean isOK(int x,int y,color c){

  if(x<0 || y<0|| x>=500||y>=500)return false;

  if(pixels[x+y*500]!=c)return false;

  return true;

}

void myFloodFill(int x,int y, color c1,color c2){

  pixels[x+y*500] = c2;

  if(isOK(x+1,y,c1))myFloodFill(x+1,y,c1,c2);

  if(isOK(x-1,y,c1))myFloodFill(x-1,y,c1,c2);

  if(isOK(x,y+1,c1))myFloodFill(x,y+1,c1,c2);

  if(isOK(x,y-1,c1))myFloodFill(x,y-1,c1,c2);

}

//week14_6_cute_cursor

void setup(){

  size(500,500);

  PImage img = loadImage("i");

  cursor(img);

  //先畫淡黃色背景

}

void draw(){

  background(#FFFFF2);

}

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