week005

01.Java程式:愛心: 

size(300, 300);

stroke(255, 0, 0);

translate(width/2,height/2);

for (int xx=-150; xx<150; xx++) {

  for (int yy=-150; yy<150; yy++) {

    float x =xx/100.0;

    float y =-yy/100.0;

    float d = x*x+y*y-1;

    if (d*d*d -x*x*y*y*y<0) point(xx, yy);

  }

}

02.Java程式:角度與弧度: 

size(600, 600);

background(0);

for (int i=0; i<6; i++) {

  for (int j=0; j<6; j++) {

    int now=i*6+j;

    ellipse(50+j*100,50+i*100,80,80);

    arc(50+j*100,50+i*100,60,60,0,now,PIE);

    arc(50+j*100,50+i*100,40,40,0,radians(now*10),PIE);

    text(now,j*100,i*100+30);

  }

}

03.Java程式:角度與弧度(2): 

void setup() {

  size(600, 600);

}

void draw() {

  background(128);

  line(200, 200, 400, 200);

  line(200, 200, mouseX, mouseY);

  float dx = mouseX-200, dy = mouseY-200;

  float a = atan2(dy, dx);

  arc(200, 200, 200, 200, 0, a, PIE);

  textSize(30);

  text("radians:"+a, 100, 100);

  text("degrees:"+degrees(a), 100, 130);

}

04.Java程式:旋轉長方形: 

void setup() {

  size(600, 600);

}

void draw() {

  background(204);

  translate( mouseX, mouseY);

  rotate(radians(frameCount*10));

  rect(50,-5, 100, 10);

}

05.Java程式:公轉與自轉長方形: 

void setup() {

  size(600, 600);

}

void draw() {

  background(204);

  pushMatrix();

  rotate(radians(frameCount*10));

  translate( width/2, height/2);

  rect(50, -5, 100, 10);

  popMatrix();

  pushMatrix();

  translate( width/2-100, height/2);

  rotate(radians(frameCount*10));

  rect(50, -5, 100, 10);

  popMatrix();

}

06.Java程式:多重旋轉長方形: 

void setup() {

  size(500, 500);

}

void draw() {

  background(204);

  for (int x=50; x<500; x+=100) {

    for (int y=50; y<500; y+=100) {

      pushMatrix();

      translate( x, y);

      rotate(radians(frameCount));

      rect(-50, 5, 100, 10);

      popMatrix();

    }

  }

}