function onMouseDown()

in src/lib/OrbitControls.js [631:672]

• 22 lines of code
• 9 McCabe index (conditional complexity)

        function onMouseDown(event) {

            if (scope.enabled === false) return;

            event.preventDefault();

            if (event.button === scope.mouseButtons.ORBIT) {

                if (scope.enableRotate === false) return;

                handleMouseDownRotate(event);

                state = STATE.ROTATE;

            } else if (event.button === scope.mouseButtons.ZOOM) {

                if (scope.enableZoom === false) return;

                handleMouseDownDolly(event);

                state = STATE.DOLLY;

            } else if (event.button === scope.mouseButtons.PAN) {

                if (scope.enablePan === false) return;

                handleMouseDownPan(event);

                state = STATE.PAN;

            }

            if (state !== STATE.NONE) {

                document.addEventListener('mousemove', onMouseMove, false);
                document.addEventListener('mouseup', onMouseUp, false);

                scope.dispatchEvent(startEvent);

            }

        }