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import pyglet
from pyglet.gl import *
# Zooming constants
ZOOM_IN_FACTOR = 1.2
ZOOM_OUT_FACTOR = 1/ZOOM_IN_FACTOR
class App(pyglet.window.Window):
def __init__(self, width, height, *args, **kwargs):
conf = Config(sample_buffers=1,
samples=4,
depth_size=16,
double_buffer=True)
super().__init__(width, height, config=conf, *args, **kwargs)
#Initialize camera values
self.left = 0
self.right = width
self.bottom = 0
self.top = height
self.zoom_level = 1
self.zoomed_width = width
self.zoomed_height = height
def init_gl(self, width, height):
# Set clear color
glClearColor(0/255, 0/255, 0/255, 0/255)
# Set antialiasing
glEnable( GL_LINE_SMOOTH )
glEnable( GL_POLYGON_SMOOTH )
glHint( GL_LINE_SMOOTH_HINT, GL_NICEST )
# Set alpha blending
glEnable( GL_BLEND )
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA )
# Set viewport
glViewport( 0, 0, width, height )
def on_resize(self, width, height):
# Set window values
self.width = width
self.height = height
# Initialize OpenGL context
self.init_gl(width, height)
def on_mouse_drag(self, x, y, dx, dy, buttons, modifiers):
# Move camera
self.left -= dx*self.zoom_level
self.right -= dx*self.zoom_level
self.bottom -= dy*self.zoom_level
self.top -= dy*self.zoom_level
def on_mouse_scroll(self, x, y, dx, dy):
# Get scale factor
f = ZOOM_IN_FACTOR if dy > 0 else ZOOM_OUT_FACTOR if dy < 0 else 1
# If zoom_level is in the proper range
if .2 < self.zoom_level*f < 5:
self.zoom_level *= f
mouse_x = x/self.width
mouse_y = y/self.height
mouse_x_in_world = self.left + mouse_x*self.zoomed_width
mouse_y_in_world = self.bottom + mouse_y*self.zoomed_height
self.zoomed_width *= f
self.zoomed_height *= f
self.left = mouse_x_in_world - mouse_x*self.zoomed_width
self.right = mouse_x_in_world + (1 - mouse_x)*self.zoomed_width
self.bottom = mouse_y_in_world - mouse_y*self.zoomed_height
self.top = mouse_y_in_world + (1 - mouse_y)*self.zoomed_height
def on_draw(self):
# Initialize Projection matrix
glMatrixMode( GL_PROJECTION )
glLoadIdentity()
# Initialize Modelview matrix
glMatrixMode( GL_MODELVIEW )
glLoadIdentity()
# Save the default modelview matrix
glPushMatrix()
# Clear window with ClearColor
glClear( GL_COLOR_BUFFER_BIT )
# Set orthographic projection matrix
glOrtho( self.left, self.right, self.bottom, self.top, 1, -1 )
# Draw quad
glBegin( GL_QUADS )
glColor3ub( 0xFF, 0, 0 )
glVertex2i( 10, 10 )
glColor3ub( 0xFF, 0xFF, 0 )
glVertex2i( 110, 10 )
glColor3ub( 0, 0xFF, 0 )
glVertex2i( 110, 110 )
glColor3ub( 0, 0, 0xFF )
glVertex2i( 10, 110 )
glEnd()
# Remove default modelview matrix
glPopMatrix()
def run(self):
pyglet.app.run()
App(500, 500).run()
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