Camera

Slut uses the concept of a camera to change the viewpoint of a scene. The active camera is a member of the world and is named "camera". The following transformations can be used to move, rotate, orbit and zoom around in the world.

Relevant examples: camera_all.py, ALL

In Context

class Atlantis(World):
    def onSetup(self):
        self.camera.moveBy(1.5, 0, 0)
        self.camera.moveBy(Tween(-2, 0, 0, 3))
        self.camera.orbitBy(Thrust(0, 45, 0))

Moving the camera backward makes all objects in perspective space (the ones drawn by onDraw() and sprites) look smaller or objects can be drawn at a bigger scale:

self.camera.moveBy(0.0, 0.0, -20.0)

Default Camera Movement

By default Slut hooks up mouse event handlers to camera transformations as defined in the slut.interaction.Interaction class. This provides simple navigation of the scene.

This behavior can be changed by defining a custom interaction class and assigning it to the world:

onMouseMove(), in the above example, is changed so that camera orbiting is done by simply [LMB] + [mouse movement]. This newly defined AtlantisInteraction class has to be assigned to the world's ia member variable to redefine the default interaction.