class TrackballCanvas(MyCanvasBase):
def __init__(self,parent,theta=45,phi=60,drawfunc=None,**kwargs):
MyCanvasBase.__init__(self,parent,**kwargs)
if drawfunc:
self.draw = drawfunc
self.trackball = Trackball(theta,phi)
self.dist = -5
def InitGL(self):
self.setupGL()
glFlush()
def OnMouseMotion(self,evt):
MyCanvasBase.OnMouseMotion(self,evt)
if evt.LeftIsDown():
w,h= map(float,self.GetSize())
x = (self.lastx*2.0 - w)/float(w)
y = (self.lasty*2.0 - w)/float(h)
dx = (self.x-self.lastx)*2.0/float(w)
dy = -(self.y-self.lasty)*2.0/float(h)
if evt.CmdDown():
self.dist += dy
else:
self.trackball.drag(x,y,dx,dy)
def OnDraw(self):
# set viewing projection
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(60,1,.01,1000)
# position viewer
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glTranslatef(0.0, 0.0, self.dist)
glMultMatrixf(self.trackball.matrix)
# clear color and depth buffers
glClear(GL_COLOR_BUFFER_BIT)
glClear(GL_DEPTH_BUFFER_BIT)
self.draw()
glFlush()
self.SwapBuffers()
def draw(self):
raise NotImplementedError()
def setupGL(self):
pass
def __init__(self,parent,theta=45,phi=60,drawfunc=None,**kwargs):
MyCanvasBase.__init__(self,parent,**kwargs)
if drawfunc:
self.draw = drawfunc
self.trackball = Trackball(theta,phi)
self.dist = -5