十个processing中运用三角函数的案例

以下是十个运用三角函数的Processing案例：

1. 用三角函数绘制正弦曲线

float angle = 0;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  stroke(0);
  noFill();
  beginShape();
  for (float x = 0; x < width; x += 5) {
    float y = sin(angle) * 100 + height/2;
    vertex(x, y);
    angle += 0.1;
  }
  endShape();
}

2. 用三角函数实现平滑移动的圆

float angle = 0;
float radius = 100;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  float x = cos(angle) * radius + width/2;
  float y = sin(angle) * radius + height/2;
  ellipse(x, y, 50, 50);
  angle += 0.1;
}

3. 用三角函数制作星形图案

float angle = 0;
float radius = 100;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  beginShape();
  for (int i = 0; i < 5; i++) {
    float x = cos(angle + i*TWO_PI/5) * radius + width/2;
    float y = sin(angle + i*TWO_PI/5) * radius + height/2;
    vertex(x, y);
  }
  endShape(CLOSE);
  angle += 0.1;
}

4. 用三角函数绘制螺旋线

float angle = 0;
float radius = 10;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  float x = cos(angle) * radius + width/2;
  float y = sin(angle) * radius + height/2;
  ellipse(x, y, 5, 5);
  angle += 0.05;
  radius += 0.1;
}

5. 用三角函数绘制椭圆轨迹

float angle = 0;
float a = 100;
float b = 50;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  float x = cos(angle) * a + width/2;
  float y = sin(angle) * b + height/2;
  ellipse(x, y, 10, 10);
  angle += 0.05;
}

6. 用三角函数制作旋转的矩形

float angle = 0;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  rectMode(CENTER);
  translate(width/2, height/2);
  rotate(angle);
  rect(0, 0, 100, 50);
  angle += 0.1;
}

7. 用三角函数绘制正多边形

float angle = 0;
float radius = 100;
int sides = 6;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  beginShape();
  for (int i = 0; i < sides; i++) {
    float x = cos(angle + i*TWO_PI/sides) * radius + width/2;
    float y = sin(angle + i*TWO_PI/sides) * radius + height/2;
    vertex(x, y);
  }
  endShape(CLOSE);
  angle += 0.1;
}

8. 用三角函数绘制波浪线

float angle = 0;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  beginShape();
  for (float x = 0; x < width; x += 5) {
    float y = sin(angle + x/10) * 50 + height/2;
    vertex(x, y);
  }
  endShape();
  angle += 0.1;
}

9. 用三角函数绘制迷宫

float angle = 0;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  stroke(0);
  for (int x = 0; x < width; x += 20) {
    for (int y = 0; y < height; y += 20) {
      if (sin(angle + x/10 + y/10) > 0) {
        line(x, y, x+20, y+20);
      } else {
        line(x+20, y, x, y+20);
      }
    }
  }
  angle += 0.1;
}

10. 用三角函数制作旋转的渐变

float angle = 0;

void setup() {
  size(400, 400);
}

void draw() {
  background(255);
  for (int x = 0; x < width; x += 10) {
    for (int y = 0; y < height; y += 10) {
      float c = map(sin(angle + x/10 + y/10), -1, 1, 0, 255);
      stroke(c);
      point(x, y);
    }
  }
  angle += 0.1;
}