Hello,
Here is an example of rotating a line using OpenGL calls. Hopefully it
will work for you, and give you some keywords to look up.
On Sat, Aug 2, 2014 at 7:35 PM, BigD <denisg...@gmail.com> wrote:
> Hey ew,
>
> As far as I know, if you want to draw a true line (ie. not a
> sprite.Sprite object) you will have to implement your own math routines to
> do the necessary transformations. You could use the euclid.py math module
> to make it easier (it was written by the same guys who wrote pyglet, google
> it). You could create a line primitive that has a .rotate and .translate
> method. Look at the sprite.Sprite class for how groups and batches work
> together and how an object position can be set/ rotated (._update_position)
> for a 2d sprite and extrapolate it needed.
>
> Denis
>
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import time
import pyglet
from pyglet import gl
window = pyglet.window.Window()
# To update the screen, there needs to be something scheduled on the Clock.
def update(dt):
pass
pyglet.clock.schedule_interval(update, 0.03)
@window.event
def on_draw():
# Clear the screen
gl.glClear(gl.GL_COLOR_BUFFER_BIT)
# Load the identity matrix (the "no-op" transformation)
gl.glLoadIdentity()
# Move the view so that the center of the screen becomes the
# origin point (0, 0)
gl.glTranslatef(window.width//2, window.height//2, 0)
# Rotate the view around the origin
# the first argument is the angle,
# the other three are the axis to rotate around (Z in our case)
gl.glRotatef((time.time() * 10) % 360, 0, 0, 1)
# Move the view back (0, 0)
gl.glTranslatef(-window.width//2, -window.height//2, 0)
# Draw a diagonal line
gl.glBegin(gl.GL_LINES)
gl.glVertex2f(0, 0)
gl.glVertex2f(window.width, window.height)
gl.glEnd(gl.GL_LINES)
pyglet.app.run()
