Function quad

Parameters

• x1: number

  x-coordinate of the first vertex

• y1: number

  y-coordinate of the first vertex

• x2: number

  x-coordinate of the second vertex

• y2: number

  y-coordinate of the second vertex

• x3: number

  x-coordinate of the third vertex

• y3: number

  y-coordinate of the third vertex

• x4: number

  x-coordinate of the fourth vertex

• y4: number

  y-coordinate of the fourth vertex