Method Update

common/camera.go:120–174

Update updates the camera. lLong tasks are attempted to update incrementally in batches.

(dt float32)

// Update updates the camera. lLong tasks are attempted to update incrementally in batches.
func (cam *CameraSystem) Update(dt float32) {
	for axis, longTask := range cam.longTasks {
		if !longTask.Incremental {
			longTask.Incremental = true
			longTask.value = longTask.Value

			switch axis {
			case XAxis:
				longTask.Value -= cam.x
			case YAxis:
				longTask.Value -= cam.y
			case ZAxis:
				longTask.Value -= cam.z
			case Angle:
				longTask.Value -= cam.angle
			}
		}

		// Set speed if needed
		if longTask.speed == 0 {
			longTask.speed = longTask.Value / float32(longTask.Duration.Seconds())
		}

		cam.moveAxis(axis, longTask.speed*dt)

		longTask.Duration -= time.Duration(dt * float32(time.Second))
		if longTask.Duration <= time.Duration(0) {

			// it enforces that the last call will have the exactly position set by `Value` when `incremental = false`.
			if longTask.value != 0 {
				cam.moveAxisTo(axis, longTask.value)
			}

			delete(cam.longTasks, axis)
		}
	}

	if cam.tracking.BasicEntity == nil {
		return
	}

	if cam.tracking.SpaceComponent == nil {
		log.Println("Should be tracking", cam.tracking.BasicEntity.ID(), "but SpaceComponent is nil")
		cam.tracking.BasicEntity = nil
		return
	}

	cam.centerCam(cam.tracking.SpaceComponent.Position.X+cam.tracking.SpaceComponent.Width/2,
		cam.tracking.SpaceComponent.Position.Y+cam.tracking.SpaceComponent.Height/2,
		cam.z,
	)
	if cam.trackRotation {
		cam.rotateTo(cam.tracking.SpaceComponent.Rotation)
	}
}

// FollowEntity sets the camera to follow the entity with BasicEntity basic
// and SpaceComponent space.