Thanks to Alans insights i have come up with a working class for a square,
overcomplicated probably but it lays the groundwork for my polygon class
which will iterate over something to generate an n-sided polygon.
If anyone is interested in actually running/testing this you need to get
hold of pgylet 1.1, http://pyglet.org/
I would welcome any suggestions/improvements etc as my class knowledge is
still somewhat lacking :-)
I was thinking about using *args to get maybe the colour information in, not
sure if i could do it with the points, is this a good idea/possible?
And how can i go about testing that i get appropriate values during the
testing/building phase (generally speaking), is it lots of print/return
statements and then remove them?
Thanks
paul
#!/usr/bin/env python
from pyglet.gl import *
class Point:
'''This init contains the x,y co-ordinates
and the colour/transparency objects
cr is red, cg is green, cb is blue and ct is transparency
a value or 1.0, 1.0, 1.0, 1.0 is white/0% transparent'''
def __init__(self, x=0, y=0, cr=1.0, cg=1.0, cb=1.0, ct=1.0):
self.x = x
self.y = y
self.cr = cr
self.cg = cg
self.cb = cb
self.ct = ct
self.col = (cr, cg, cb, ct)
class Square:
'''First version, requires four points, an optional filled field
and an optional line width field.
The next version will iterate over a loop to allow the
construction of polygons'''
def __init__(self, p1, p2, p3, p4, filled=True, line_width=1):
self.points = [p1,p2,p3,p4]
self.filled = filled
self.line_width = line_width
def draw(self):
draw_square(self.points[0].x, self.points[0].y, self.points[0].col,
self.points[1].x,self.points[1].y, self.points[1].col, self.points[2].x,
self.points[2].y, self.points[2].col, self.points[3].x, self.points[3].y,
self.points[3].col, self.filled, self.line_width)
def draw_square(x0, y0, col0, x1, y1, col1, x2, y2, col2, x3, y3, col3,
filled=True, line_width=1):
if filled:
glBegin(GL_QUADS)
else:
glLineWidth(line_width)
glBegin(GL_LINE_LOOP)
glColor4f(col0[0], col0[1], col0[2], col0[3])
glVertex2i(int(x0), int(y0))
glColor4f(col1[0], col1[1], col1[2], col1[3])
glVertex2i(int(x1), int(y1))
glColor4f(col2[0], col2[1], col2[2], col2[3])
glVertex2i(int(x2), int(y2))
glColor4f(col3[0], col3[1], col3[2], col3[3])
glVertex2i(int(x3), int(y3))
glEnd()
if not filled and line_width != 1: # reset to default
glLineWidth(1)
if __name__ == '__main__':
from pyglet import window
window = window.Window(250, 250)
s1 = Square(Point(50,50,cg=0.0,cb=0.0), Point(200,50,cr=0.0,cb=0.0),
Point(200,200,cr=0.0,cg=0.0), Point(50,200), filled=False, line_width=2)
@window.event
def on_draw():
window.clear()
s1.draw()
pyglet.app.run()
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