eclipse_renderer.py 文件源码

def getSunSize(self, p):
        """Get the size of the sun in screen pixels.

        This is a hack: it renders the sun, then finds the contour
        surrounding the sun and computes the center/radius of that.
        """
        self.fbo.bind()
        self.clear_background()
        self.fbo.release()
        dt, sun_alt, sun_az, moon_alt, moon_az, sun_r, moon_r, sep, parallactic_angle, lat, lon = p
        sun_coords = horizontal_to_cartesian(deg(sun_alt), deg(sun_az))
        sun_x, sun_y, sun_z = scale_vector(sun_coords, SUN_EARTH_DISTANCE)
        self.fbo.bind()
        self.draw_sun(sun_x, sun_y, sun_z)
        glFlush()
        self.fbo.release()
        image = self.fbo.toImage()
        # Find the contours of the sun in the image
        contours = self.find_contours(image)
        # Make a poly that fits the contour
        poly = cv2.approxPolyDP( np.array(contours[0]), 3, True )
        # Find the minimum enclosing circle of the polygon
        c = cv2.minEnclosingCircle(poly)
        self.fbo.bind()
        self.clear_background()
        self.fbo.release()
        return c