Method Pan

camera/orbit_control.go:189–209

Pan pans the camera and target the specified amount on the plane perpendicular to the viewing direction.

(deltaX, deltaY float32)

// Pan pans the camera and target the specified amount on the plane perpendicular to the viewing direction.
func (oc *OrbitControl) Pan(deltaX, deltaY float32) {

	// Compute direction vector from camera to target
	position := oc.cam.Position()
	vdir := oc.target.Clone().Sub(&position)

	// Conversion constant between an on-screen cursor delta and its projection on the target plane
	c := 2 * vdir.Length() * math32.Tan((oc.cam.Fov()/2.0)*math32.Pi/180.0) / oc.winSize()

	// Calculate pan components, scale by the converted offsets and combine them
	var pan, panX, panY math32.Vector3
	panX.CrossVectors(&oc.up, vdir).Normalize()
	panY.CrossVectors(vdir, &panX).Normalize()
	panY.MultiplyScalar(c * deltaY)
	panX.MultiplyScalar(c * deltaX)
	pan.AddVectors(&panX, &panY)

	// Add pan offset to camera and target
	oc.cam.SetPositionVec(position.Add(&pan))
	oc.target.Add(&pan)
}

// onMouse is called when an OnMouseDown/OnMouseUp event is received.
func (oc *OrbitControl) onMouse(evname string, ev interface{}) {