triangle

ZG

int width = 200;

int height = 200;

float[][] rotateMatrix = new float[2][2];

void setup()

{

  size (width,height);

  noLoop();

}

void draw()

{

  int x0, y0, x1, y1, x2, y2;

  x0 = int(random(width));

  y0 = int(random(height));

  x1 = int(random(width));

  y1 = int(random(height));

  x2 = int(random(width));

  y2 = int(random(height));

  for (float i =0; i <>

  {

  float rotateAngle = i * PI;

  rotation(x0, y0, x1, y1, x2, y2, rotateAngle);

  }

}

void rotation(int x0, int y0, int x1, int y1, int x2, int y2, float rotateAngle)

{

  buildMatrix(rotateAngle);

  

float[][] trianglePoints = {{x0, y0}, {x1, y1}, {x2, y2}};

  triangle(trianglePoints[0][0],trianglePoints[0][1],trianglePoints[1][0],trianglePoints[1][1],trianglePoints[2][0],trianglePoints[2][1]);

  

  trianglePoints = multiply(trianglePoints, rotateMatrix);

  triangle(trianglePoints[0][0],trianglePoints[0][1],trianglePoints[1][0],trianglePoints[1][1],trianglePoints[2][0],trianglePoints[2][1]);

  

  

}

float[][] multiply(float[][]a, float[][]b)

{

  float[][]c = new float[a.length][b[0].length];

  for (int i = 0; i <>

    for (int j = 0; j <>

      for (int k = 0; k <>

        c[i][j] += a[i][k] * b[k][j];

      }

    }

  }

  return c;

}

void buildMatrix(float rotateAngle)

{

  rotateMatrix[0][0] = cos(rotateAngle);

  rotateMatrix[0][1] = sin(rotateAngle);

  rotateMatrix[1][0] = -sin(rotateAngle);

  rotateMatrix[1][1] = cos(rotateAngle);

}