def get_proj(self):
"""Create the projection matrix from the current viewing
position.
elev stores the elevation angle in the z plane
azim stores the azimuth angle in the x,y plane
dist is the distance of the eye viewing point from the object
point.
"""
relev, razim = np.pi * self.elev/180, np.pi * self.azim/180
xmin, xmax = self.get_xlim3d()
ymin, ymax = self.get_ylim3d()
zmin, zmax = self.get_zlim3d()
worldM = proj3d.world_transformation(xmin, xmax,
ymin, ymax,
zmin, zmax)
R = np.array([0.5, 0.5, 0.5])
xp = R[0] + np.cos(razim) * np.cos(relev) * self.dist
yp = R[1] + np.sin(razim) * np.cos(relev) * self.dist
zp = R[2] + np.sin(relev) * self.dist
E = np.array((xp, yp, zp))
self.eye = E
self.vvec = R - E
self.vvec = self.vvec / proj3d.mod(self.vvec)
if abs(relev) > np.pi/2:
V = np.array((0, 0, -1))
else:
V = np.array((0, 0, 1))
zfront, zback = -self.dist, self.dist
viewM = proj3d.view_transformation(E, R, V)
perspM = proj3d.persp_transformation(zfront, zback)
M0 = np.dot(viewM, worldM)
M = np.dot(perspM, M0)
return M
def get_proj(self):
"""Create the projection matrix from the current viewing
position.
elev stores the elevation angle in the z plane
azim stores the azimuth angle in the x,y plane
dist is the distance of the eye viewing point from the object
point.
"""
relev,razim = npy.pi * self.elev/180, npy.pi * self.azim/180
xmin,xmax = self.get_w_xlim()
ymin,ymax = self.get_w_ylim()
zmin,zmax = self.get_w_zlim()
# transform to uniform world coordinates 0-1.0,0-1.0,0-1.0
worldM = proj3d.world_transformation(xmin,xmax,
ymin,ymax,
zmin,zmax)
# look into the middle of the new coordinates
R = npy.array([0.5,0.5,0.5])
#
xp = R[0] + npy.cos(razim)*npy.cos(relev)*self.dist
yp = R[1] + npy.sin(razim)*npy.cos(relev)*self.dist
zp = R[2] + npy.sin(relev)*self.dist
E = npy.array((xp, yp, zp))
#
self.eye = E
self.vvec = R - E
self.vvec = self.vvec / proj3d.mod(self.vvec)
if abs(relev) > npy.pi/2:
# upside down
V = npy.array((0,0,-1))
else:
V = npy.array((0,0,1))
zfront,zback = -self.dist,self.dist
viewM = proj3d.view_transformation(E,R,V)
perspM = proj3d.persp_transformation(zfront,zback)
M0 = npy.dot(viewM,worldM)
M = npy.dot(perspM,M0)
return M