Source Code Corner Boxes in OpenGL

[Meow]

Game Name

N/A

How long you been coding/hacking?

3 years / few months

Since these are pretty popular here's my version of corner boxes (corner boxes?) in opengl. If someone translates it to cpp consider posting it here aswell.

proc cornerBox(x, y, width, height: float, color, outlineColor: array[0..2, float32], lineWidth: float = 1) =
  template drawCorner =
    glBegin(GL_LINES)
    # Lower Left
    glVertex2f(x, y); glVertex2f(x + lineW, y)
    glVertex2f(x, y); glVertex2f(x, y + lineH)

    # Lower Right
    glVertex2f(x + width, y); glVertex2f(x + width, y + lineH)
    glVertex2f(x + width, y); glVertex2f(x + width - lineW, y)

    # Upper Left
    glVertex2f(x, y + height); glVertex2f(x, y + height - lineH)
    glVertex2f(x, y + height); glVertex2f(x + lineW, y + height)

    # Upper Right
    glVertex2f(x + width, y + height); glVertex2f(x + width, y + height - lineH)
    glVertex2f(x + width, y + height); glVertex2f(x + width - lineW, y + height)
    glEnd()

  let
    lineW = width / 4
    lineH = height / 3

  glLineWidth(lineWidth + 2)
  glColor3f(outlineColor[0], outlineColor[1], outlineColor[2])
  drawCorner()
  glLineWidth(lineWidth)
  glColor3f(color[0], color[1], color[2])
  drawCorner()