Week11 李彩鳳筆記

畫盤子

PVector [] dish=new PVector[4];

void setup (){

  size(640,480);

  dish[0]=new PVector(100,100);

  dish[1]=new PVector(540,100);

  dish[2]=new PVector(100,380);

  dish[3]=new PVector(540,380);

}

void draw (){

  background(255);

  ellipse(320,240,400,400);//rotating circle

  ellipse(100,100,100,100);

  ellipse(540,100,100,100);

  ellipse(100,380,100,100);

  ellipse(540,380,100,100);

  for(int i=0;i<4;i++){

    ellipse(dish[i].x,dish[i].y,90,90);

  }

}

int nowDish=-1;

void mousePressed(){

  for(int i=0;i<4;i++){

          nowDish=i;

    }

  }

}

void mouseDragged(){

  if(nowDish!= -1){

    dish[nowDish].x=mouseX;

    dish[nowDish].y=mouseY;

  }

}

void mouseReleased(){

  nowDish= -1;

}

旋轉盤子

PVector [] dish=new PVector[4];

float [] r = {0, 0, 0, 0};

float [] angle = {0, 0, 0, 0};

void setup() {

  size(640, 480);

  dish[0]=new PVector(100, 100);

  dish[1]=new PVector(540, 100);

  dish[2]=new PVector(100, 380);

  dish[3]=new PVector(540, 380);

}

void draw() {

  background(255);

  ellipse(320, 240, 400, 400);//rotating circle

  ellipse(100, 100, 100, 100);

  ellipse(540, 100, 100, 100);

  ellipse(100, 380, 100, 100);

  ellipse(540, 380, 100, 100);

  for (int i=0; i<4; i++) {

    ellipse(dish[i].x, dish[i].y, 90, 90);

    line(dish[i].x, dish[i].y, 320, 240);

  }

  if (keyPressed) {

    for (int i=0; i<4; i++) {

      angle[i] -= 0.01;

      dish[i].x= r[i] * cos(angle[i]) + 320;

      dish[i].y= r[i] * sin(angle[i]) + 240;

    }

  }

}

int nowDish=-1;

void mousePressed() {

  for (int i=0; i<4; i++) {

    if ( dist(dish[i].x, dish[i].y, mouseX, mouseY) <45 ) {

      nowDish=i;

    }

  }

}

void mouseDragged() {

  if ( nowDish!= -1) {

    dish[nowDish].x=mouseX;

    dish[nowDish].y=mouseY;

    r[nowDish] = sqrt( (mouseX-320)*(mouseX-320) + (mouseY-240)*(mouseY-240) );

    angle[nowDish] = atan2(mouseY-240, mouseX-320);

  }

}

void mouseReleased() {

  nowDish = -1;

}

使用 sin, cosin, atan2 計算角度

按下任何鍵即可旋轉

Car

void setup() {

  size(640, 480, P3D);

  rectMode(CENTER);

}

float carX=640/2, carY=320/2;

float carDir=0, carWheel=0;

void drawCar() {

  pushMatrix();

  translate(carX, carY);

  rotateZ(carDir);

  rect(0, 0, 187, 89);

  drawWheel(127/2, 89/2, 1);

  drawWheel(127/2, -89/2, 1);

  drawWheel(-127/2, 89/2, 0);

  drawWheel(-127/2, -89/2, 0);

  if (keyPressed && keyCode==UP) {

    carX+= cos(carDir+carWheel); 

    carY+=sin(carDir+carWheel);

    carDir+=carWheel/50;

  } else if (keyPressed && keyCode==DOWN) {

    carX-= cos(carDir+carWheel); 

    carY-=sin(carDir+carWheel);

    carDir-=carWheel/50;

  } else if (keyPressed && keyCode==RIGHT) {

    carWheel+=0.01;

    if (carWheel > 0.3) carWheel=0.3;

  } else if (keyPressed && keyCode==LEFT) {

    carWheel-=0.01;

    if (carWheel < -0.3) carWheel=-0.3;

  }

  popMatrix();

}

void drawWheel(float x, float y, int front) {

  pushMatrix();

  translate(x, y);

  if (front==1) rotateZ(carWheel);

  rect(0, 0, 40, 20);

  popMatrix();

}

void draw() {

  background(100);

  drawCar();

}

Car parking 

void setup() {

  size(640, 480, P3D);

  rectMode(CENTER);

}

float carX=640/2, carY=320/2;

float carDir=PI, carWheel=0;

void drawCar() {

  pushMatrix();

  translate(carX, carY);

  rotateZ(carDir);

  rect(0, 0, 187, 89);

  drawWheel(127/2, 89/2, 1);

  drawWheel(127/2, -89/2, 1);

  drawWheel(-127/2, 89/2, 0);

  drawWheel(-127/2, -89/2, 0);

  if (keyPressed && keyCode==UP) {

    carX+= cos(carDir+carWheel); 

    carY+=sin(carDir+carWheel);

    carDir+=carWheel/50;

  } else if (keyPressed && keyCode==DOWN) {

    carX-= cos(carDir+carWheel); 

    carY-=sin(carDir+carWheel);

    carDir-=carWheel/50;

  } else if (keyPressed && keyCode==RIGHT) {

    carWheel+=0.01;

    if (carWheel > 0.3) carWheel=0.3;

  } else if (keyPressed && keyCode==LEFT) {

    carWheel-=0.01;

    if (carWheel < -0.3) carWheel=-0.3;

  }

  popMatrix();

}

void drawWheel(float x, float y, int front) {

  pushMatrix();

  translate(x, y);

  if (front==1) rotateZ(carWheel);

  rect(0, 0, 40, 20);

  popMatrix();

}

void draw() {

  background(100);

  drawCar();

  rect(0+187/2, 0+89/2, 187, 89);

  rect(450+187/2, 0+89/2, 187, 89);

}