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from minigl import *
import math
import array, itertools
def use_pango_font(font, start, count, will_call_prepost=False):
import pango, cairo, pangocairo
fontDesc = pango.FontDescription(font)
a = array.array('b', itertools.repeat(0, 256*256))
surface = cairo.ImageSurface.create_for_data(a, cairo.FORMAT_A8, 256, 256)
context = pangocairo.CairoContext(cairo.Context(surface))
layout = context.create_layout()
fontmap = pangocairo.cairo_font_map_get_default()
font = fontmap.load_font(fontmap.create_context(), fontDesc)
layout.set_font_description(fontDesc)
metrics = font.get_metrics()
descent = metrics.get_descent()
d = pango.PIXELS(descent)
linespace = metrics.get_ascent() + metrics.get_descent()
width = metrics.get_approximate_char_width()
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT)
glPixelStorei(GL_UNPACK_SWAP_BYTES, 0)
glPixelStorei(GL_UNPACK_LSB_FIRST, 1)
glPixelStorei(GL_UNPACK_ROW_LENGTH, 256)
glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, 256)
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0)
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0)
glPixelStorei(GL_UNPACK_SKIP_IMAGES, 0)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
glPixelZoom(1, -1)
base = glGenLists(count)
for i in range(count):
ch = unichr(start+i)
layout.set_text(ch)
w, h = layout.get_size()
context.save()
context.new_path()
context.rectangle(0, 0, 256, 256)
context.set_source_rgba(0., 0., 0., 0.)
context.set_operator (cairo.OPERATOR_SOURCE);
context.paint()
context.restore()
context.save()
context.set_source_rgba(1., 1., 1., 1.)
context.set_operator (cairo.OPERATOR_SOURCE);
context.move_to(0, 0)
context.update_layout(layout)
context.show_layout(layout)
context.restore()
w, h = pango.PIXELS(w), pango.PIXELS(h)
glNewList(base+i, GL_COMPILE)
glBitmap(0, 0, 0, 0, 0, h-d, '');
if not will_call_prepost: pango_font_pre()
if w and h: glDrawPixels(w, h, GL_LUMINANCE, GL_UNSIGNED_BYTE, a)
glBitmap(0, 0, 0, 0, w, -h+d, '');
if not will_call_prepost: pango_font_post()
glEndList()
glPopClientAttrib()
return base, pango.PIXELS(width), pango.PIXELS(linespace)
def pango_font_pre(rgba=(1., 1., 0., 1.)):
glPushAttrib(GL_COLOR_BUFFER_BIT)
glEnable(GL_BLEND)
glBlendFunc(GL_ONE, GL_ONE)
def pango_font_post():
glPopAttrib()
def glTranslateScene(w, s, x, y, mousex, mousey):
glMatrixMode(GL_MODELVIEW)
mat = glGetDoublev(GL_MODELVIEW_MATRIX)
glLoadIdentity()
glTranslatef(s * (x - mousex), s * (mousey - y), 0.0)
glMultMatrixd(mat)
def glRotateScene(w, s, xcenter, ycenter, zcenter, x, y, mousex, mousey):
def snap(a):
m = a%90
if m < 3:
return a-m
elif m > 87:
return a-m+90
else:
return a
lat = min(w.maxlat, max(w.minlat, w.lat + (y - mousey) * .5))
lon = (w.lon + (x - mousex) * .5) % 360
glMatrixMode(GL_MODELVIEW)
glTranslatef(xcenter, ycenter, zcenter)
mat = glGetDoublev(GL_MODELVIEW_MATRIX)
glLoadIdentity()
tx, ty, tz = mat[12:15]
glTranslatef(tx, ty, tz)
glRotatef(snap(lat), *w.rotation_vectors[0])
glRotatef(snap(lon), *w.rotation_vectors[1])
glTranslatef(-xcenter, -ycenter, -zcenter)
w.lat = lat
w.lon = lon
def sub(x, y):
return map(lambda a, b: a-b, x, y)
def dot(x, y):
t = 0
for i in range(len(x)):
t = t + x[i]*y[i]
return t
def glDistFromLine(x, p1, p2):
f = map(lambda x, y: x-y, p2, p1)
g = map(lambda x, y: x-y, x, p1)
return dot(g, g) - dot(f, g)**2/dot(f, f)
def v3distsq(a,b):
d = ( a[0] - b[0], a[1] - b[1], a[2] - b[2] )
return d[0]*d[0] + d[1]*d[1] + d[2]*d[2]
class GlNavBase:
rotation_vectors = [(1.,0.,0.), (0., 0., 1.)]
def __init__(self):
# Current coordinates of the mouse.
self.xmouse = 0
self.ymouse = 0
# Where we are centering.
self.xcenter = 0.0
self.ycenter = 0.0
self.zcenter = 0.0
# The _back color
self.r_back = 1.
self.g_back = 0.
self.b_back = 1.
# Where the eye is
self.distance = 10.0
# Field of view in y direction
self.fovy = 30.0
# Position of clipping planes.
self.near = 0.1
self.far = 1000.0
# View settings
self.perspective = 0
self.lat = 0
self.minlat = -90
self.maxlat = 90
# This should almost certainly be part of some derived class.
# But I have put it here for convenience.
def basic_lighting(self):
"""\
Set up some basic lighting (single infinite light source).
Also switch on the depth buffer."""
self.activate()
glLightfv(GL_LIGHT0, GL_POSITION, (1, -1, 1, 0))
glLightfv(GL_LIGHT0, GL_AMBIENT, (.4, .4, .4, 1))
glLightfv(GL_LIGHT0, GL_DIFFUSE, (.6, .6, .6, 1))
glEnable(GL_LIGHTING)
glEnable(GL_LIGHT0)
glDepthFunc(GL_LESS)
glEnable(GL_DEPTH_TEST)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
def set_background(self, r, g, b):
"""Change the background colour of the widget."""
self.r_back = r
self.g_back = g
self.b_back = b
self._redraw()
def set_centerpoint(self, x, y, z):
"""Set the new center point for the model.
This is where we are looking."""
self.xcenter = x
self.ycenter = y
self.zcenter = z
self._redraw()
def set_latitudelimits(self, minlat, maxlat):
"""Set the new "latitude" limits for rotations."""
if maxlat > 180:
return
if minlat < -180:
return
if maxlat <= minlat:
return
self.maxlat = maxlat
self.minlat = minlat
self._redraw()
def set_eyepoint(self, distance):
"""Set how far the eye is from the position we are looking."""
self.distance = distance
self._redraw()
def set_eyepoint_from_extents(self, e1, e2):
"""Set how far the eye is from the position we are looking
based on the screen width and height of a subject."""
w = self.winfo_width()
h = self.winfo_height()
ztran = max(2.0, e1, e2 * w/h) ** 2
self.set_eyepoint(ztran - self.zcenter)
def reset(self):
"""Reset rotation matrix for this widget."""
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
self._redraw()
def recordMouse(self, x, y):
self.xmouse = x
self.ymouse = y
def startRotate(self, x, y):
self.recordMouse(x, y)
def scale(self, x, y):
"""Scale the scene. Achieved by moving the eye position.
Dragging up zooms in, while dragging down zooms out
"""
scale = 1 - 0.01 * (event.y - self.ymouse)
# do some sanity checks, scale no more than
# 1:1000 on any given click+drag
if scale < 0.001:
scale = 0.001
elif scale > 1000:
scale = 1000
newdistance = self.distance * scale
if newdistance < 1e-30 or newdistance > 1e30:
return
self.distance = newdistance
self._redraw()
self.recordMouse(x, y)
def rotate(self, x, y):
"""Perform rotation of scene."""
self.activate()
self.perspective = True
glRotateScene(self, 0.5, self.xcenter, self.ycenter, self.zcenter, x, y, self.xmouse, self.ymouse)
self._redraw()
self.recordMouse(x, y)
def translate(self, x, y):
"""Perform translation of scene."""
self.activate()
# Scale mouse translations to object viewplane so object tracks with mouse
win_height = max( 1,self.winfo_height() )
obj_c = ( self.xcenter, self.ycenter, self.zcenter )
win = gluProject( obj_c[0], obj_c[1], obj_c[2])
obj = gluUnProject( win[0], win[1] + 0.5 * win_height, win[2])
dist = math.sqrt( v3distsq( obj, obj_c ) )
scale = abs( dist / ( 0.5 * win_height ) )
glTranslateScene(self, scale, x, y, self.xmouse, self.ymouse)
self._redraw()
self.recordMouse(x, y)
def set_viewangle(self, lat, lon):
self.lat = lat
self.lon = lon
glRotateScene(self, 0.5, self.xcenter, self.ycenter, self.zcenter, 0, 0, 0, 0)
self.tkRedraw()
def get_zoom_distance(self):
data = self.distance
return data
def set_zoom_distance(self,data):
self.distance = data
self._redraw()
def zoomin(self):
self.distance = self.distance / 1.1
self._redraw()
def zoomout(self):
self.distance = self.distance * 1.1
self._redraw()
def startZoom(self, y):
self.y0 = y
self.original_zoom = self.distance
def continueZoom(self, y):
dy = y - self.y0
self.distance = self.original_zoom * pow(1.25, dy / 16.)
self._redraw()
def getRotateMode(self): return False
def translateOrRotate(self, x, y):
if self.getRotateMode():
self.rotate(x, y)
else:
self.translate(x, y)
def rotateOrTranslate(self, x, y):
if not self.getRotateMode():
self.rotate(x, y)
else:
self.translate(x, y)
def set_view_x(self):
self.reset()
glRotatef(-90, 0, 1, 0)
glRotatef(-90, 1, 0, 0)
mid, size = self.extents_info()
glTranslatef(-mid[0], -mid[1], -mid[2])
self.set_eyepoint_from_extents(size[1], size[2])
self.perspective = False
self.lat = -90
self.lon = 270
self._redraw()
def set_view_y(self):
self.reset()
glRotatef(-90, 1, 0, 0)
if self.is_lathe():
glRotatef(90, 0, 1, 0)
mid, size = self.extents_info()
glTranslatef(-mid[0], -mid[1], -mid[2])
self.set_eyepoint_from_extents(size[0], size[2])
self.perspective = False
self.lat = -90
self.lon = 0
self._redraw()
# lathe backtool display
def set_view_y2(self):
self.reset()
glRotatef(90, 1, 0, 0)
glRotatef(90, 0, 1, 0)
mid, size = self.extents_info()
glTranslatef(-mid[0], -mid[1], -mid[2])
self.set_eyepoint_from_extents(size[0], size[2])
self.perspective = False
self.lat = -90
self.lon = 0
self._redraw()
def set_view_z(self):
self.reset()
mid, size = self.extents_info()
glTranslatef(-mid[0], -mid[1], -mid[2])
self.set_eyepoint_from_extents(size[0], size[1])
self.perspective = False
self.lat = self.lon = 0
self._redraw()
def set_view_z2(self):
self.reset()
glRotatef(-90, 0, 0, 1)
mid, size = self.extents_info()
glTranslatef(-mid[0], -mid[1], -mid[2])
self.set_eyepoint_from_extents(size[1], size[0])
self.perspective = False
self.lat = 0
self.lon = 270
self._redraw()
def set_view_p(self):
self.reset()
self.perspective = True
mid, size = self.extents_info()
glTranslatef(-mid[0], -mid[1], -mid[2])
size = (size[0] ** 2 + size[1] ** 2 + size[2] ** 2) ** .5
if size > 1e99: size = 5. # in case there are no moves in the preview
w = self.winfo_width()
h = self.winfo_height()
fovx = self.fovy * w / h
fov = min(fovx, self.fovy)
self.set_eyepoint((size * 1.1 + 1.0) / 2 / math.sin ( fov * math.pi / 180 / 2))
self.lat = -60
self.lon = 335
glRotateScene(self, 1.0, mid[0], mid[1], mid[2], 0, 0, 0, 0)
self._redraw()
# vim:ts=8:sts=4:sw=4:et:
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