Hi Tristam,
Thanks for this, although it seems as though I can't get it to work
correctly.
This is the code I have so far ...
import math
import pyglet
from pyglet.gl import *
from dotmic.pyglet import extensions
window = extensions.Window(width=1024, height=768)
class Rotation(object):
def __init__(self):
self.angle = 0.0
self.x = 0.0
self.y = 0.0
rotation = Rotation()
def world():
glColor3f(0.2, 0.2, 0.2)
glPushMatrix()
glTranslatef(window.width / 2, window.height / 2, 0.0)
glRotatef(rotation.angle, 0.0, 0.0, 1.0)
size = 300
glBegin(GL_QUADS)
glVertex2f(size, size) # Top right
glVertex2f(-size, size) # Top left
glVertex2f(-size, -size) # Bottom left
glVertex2f(size, -size) # Bottom right
glEnd()
glPopMatrix()
angle = math.radians(rotation.angle)
rotation.x, rotation.y = size * math.cos(angle), size * math.sin
(angle)
glColor3f(1.0, 1.0, 1.0)
glBegin(GL_POINTS)
glVertex2f(rotation.x, rotation.y)
glEnd()
@window.event
def on_mouse_scroll(x, y, scroll_x, scroll_y):
rotation.angle += scroll_y
@window.event
def on_draw():
glClear(GL_COLOR_BUFFER_BIT)
glLoadIdentity()
world()
fps.draw()
fps = pyglet.clock.ClockDisplay()
window.set_visible()
pyglet.app.run()
(Ignore the extensions stuff, it's just a window subclass that auto
centers the window on the screen)
What I'm trying to achieve is to have a white point attached to each
corner of the quad, that are located on the normal matrix rather than
the rotated one. I have started here with the top right corner, and as
you can see it's not quite working right. I was hoping to avoid trig
as it's not my strong point.
Any ideas ?
Thanks
-Mic
On Dec 23, 6:20 pm, "Tristam MacDonald" <[email protected]> wrote:
> On Tue, Dec 23, 2008 at 1:57 PM, Mic Pringle <[email protected]> wrote:
>
> > Hi,
>
> > Does anyone know if its possible to find out the corner point
> > locations of a quad after it's been rotated using glRotatef ?
>
> There is no functionality in the API for this, however you can calculate
> where it will be using trigonometry or (arguably simplex) matrices.
>
> Given your rotation by 5 degrees (I assume you meant about the y-axis), the
> trig solution would look like this:
>
> angle = math.radians(5.0)
>
> new_x = x * math.cos(angle)
> new_y = y * math.sin(angle)
>
> - Tristam
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