Hello everyone,
I'm new to python and pyglet in general. Right now I'm trying to build a
very simple GUI and I came accross an issue with batch drawing.
I want to draw a menu bar at the top of a pyglet window and i want to use
batch drawing. Below is a code sample for you to reproduce my issue. A
rectangle and a line will be drawn. The problem accures when I resize this
window, the width and height of this rectangle and line will be updated,
but also its former position will be visible.
import pyglet
from pyglet.gl import *
batch = pyglet.graphics.Batch()
background = pyglet.graphics.OrderedGroup(0)
foreground = pyglet.graphics.OrderedGroup(1)
class Edit_Window(pyglet.window.Window):
def __init__(self,*args,**kwargs):
super().__init__(*args, **kwargs)
self.menu_bar_height = 40
glClearColor(1.0, 1.0, 1.0, 1.0)
def menu_bar(self):
self.indices = [0, 1, 2, 2, 3, 1]
self.vertex = [0,self.height,
0,(self.height - self.menu_bar_height),
self.width,self.height,
self.width,(self.height-self.menu_bar_height)]
self.color = [0.8, 0.8, 0.8,
0.8, 0.8, 0.8,
0.8, 0.8, 0.8,
0.8, 0.8, 0.8]
self.line_vertex = [0,(self.height-self.menu_bar_height),
self.width,(self.height-self.menu_bar_height)]
self.vertices = batch.add_indexed(4, GL_TRIANGLES, background,
self.indices, ('v2f', self.vertex), ('c3f', self.color))
self.line_vertices = batch.add_indexed(2, GL_LINES, background, [0,1],
('v2f', self.line_vertex) ,('c3f', (0.5,0.5,0.5, 0.5,0.5,0.5)))
def on_draw(self):
self.clear()
self.menu_bar()
batch.draw()
if __name__ == '__main__':
edit_window = Edit_Window(resizable=True)
pyglet.app.run()
It works as intended, when I dont use batch drawing, i.e. when i replace
the lines:
self.vertices = batch.add_indexed(4, GL_TRIANGLES, background,
self.indices, ('v2f', self.vertex), ('c3f', self.color))
self.line_vertices = batch.add_indexed(2, GL_LINES, background, [0,1],
('v2f', self.line_vertex) ,('c3f', (0.5,0.5,0.5, 0.5,0.5,0.5)))
with:
self.line_vertices = pyglet.graphics.vertex_list_indexed(2, [0,1],
('v2f', self.line_vertex) ,('c3f', (0.5,0.5,0.5, 0.5,0.5,0.5)))
self.line_vertices.draw(GL_LINES)
self.vertices = pyglet.graphics.vertex_list_indexed(4, self.indices,
('v2f', self.vertex) ,('c3f', self.color))
self.vertices.draw(GL_TRIANGLES)
With this replacement everything is resized correctly. Is there a way to
get this behaviour while using batch drawing? Am I using batch drawing
wrong? ( I mainly want to use batch drawing to make use of it's groups)
Regards,
Jens
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