processing中5个三角函数运用的案例

在processing中，常用的五个三角函数是sin(), cos(), tan(), asin()和acos()。以下是一些这些函数的应用案例：

1. 绘制正弦波

float angle = 0;

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

void draw() {
  background(255);
  translate(200, 200);
  stroke(0);
  noFill();
  beginShape();
  for (int i = 0; i < 360; i++) {
    float y = sin(radians(i)) * 100;
    vertex(i, y);
  }
  endShape();
  angle += 5;
}

2. 绘制螺旋线

float angle = 0;

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

void draw() {
  background(255);
  translate(200, 200);
  stroke(0);
  noFill();
  beginShape();
  for (int i = 0; i < 360; i++) {
    float r = i;
    float x = r * cos(radians(angle));
    float y = r * sin(radians(angle));
    vertex(x, y);
  }
  endShape();
  angle += 5;
}

3. 旋转图形

float angle = 0;

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

void draw() {
  background(255);
  translate(200, 200);
  rotate(radians(angle));
  rectMode(CENTER);
  rect(0, 0, 100, 100);
  angle += 5;
}

4. 创建动态效果

float angle = 0;

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

void draw() {
  background(255);
  translate(200, 200);
  rotate(radians(angle));
  scale(sin(radians(angle)) + 2);
  rectMode(CENTER);
  rect(0, 0, 100, 100);
  angle += 5;
}

5. 生成随机数

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

void draw() {
  background(255);
  stroke(0);
  for (int i = 0; i < 100; i++) {
    float x = random(width);
    float y = random(height);
    point(x, y);
  }
}