Flick Gesture in Unity3D Android

Question

I'm trying to create a football game where the user will make a flick gesture in order to kick the ball. I'm quite new to developing games in unity3d, I have successfully made a moving ball, added some rotation, gravity and some basic input (the ball follows the touch coordinates). How can I achieve the flick gesture?

Answer 1

A nice resource regarding basics of flick gesturing at MSDN http://msdn.microsoft.com/en-us/library/windows/desktop/ms694980%28v=vs.85%29.aspx

Regarding Unity3D, you can take help from the following resource http://forum.unity3d.com/threads/53587-Flick-and-Slide

The following code may help you

    // one finger gestures
    if (iPhoneInput.touchCount == 1) {

        // finger data
        iPhoneTouch f0 = iPhoneInput.GetTouch(0);

        // finger delta
        Vector3 f0Delta = new Vector3(f0.deltaPosition.x, -f0.deltaPosition.y, 0);

        // if finger moving
        if (f0.phase == iPhoneTouchPhase.Moved) {

            // compute orbit speed
            orbitSpeed += (f0Delta + f0Delta * distWeight) * orbitScreenToWorldRatio * Time.deltaTime;
        }
    }

    // two fingers gestures
    else if (iPhoneInput.touchCount == 2) {

        // fingers data
        iPhoneTouch f0 = iPhoneInput.GetTouch(0);
        iPhoneTouch f1 = iPhoneInput.GetTouch(1);

        // fingers positions
        Vector3 f0Pos = new Vector3(f0.position.x, f0.position.y, 0);
        Vector3 f1Pos = new Vector3(f1.position.x, f1.position.y, 0);

        // fingers movements
        Vector3 f0Delta = new Vector3(f0.deltaPosition.x, f0.deltaPosition.y, 0);
        Vector3 f1Delta = new Vector3(f1.deltaPosition.x, f1.deltaPosition.y, 0);

        // fingers distance
        float f0f1Dist = Vector3.Distance(f0.position, f1.position);

        // if both fingers moving
        if (f0.phase == iPhoneTouchPhase.Moved && f1.phase == iPhoneTouchPhase.Moved) {

            // fingers moving direction
            Vector3 f0Dir = f0Delta.normalized;
            Vector3 f1Dir = f1Delta.normalized;

            // dot product of directions
            float dot = Vector3.Dot(f0Dir, f1Dir);

            // if fingers moving in opposite directions
            if (dot < -0.7f) {

                float pinchDelta = f0f1Dist - lastf0f1Dist;

                // if fingers move more than a threshold
                if (Mathf.Abs(pinchDelta) > 2) {

                    // if pinch out, zoom in 
                    if (f0f1Dist > lastf0f1Dist && zoomDistance > zoomNearLimit) {
                        zoomSpeed += (pinchDelta + pinchDelta * distWeight) * Time.deltaTime * zoomScreenToWorldRatio;
                    }

                    // if pinch in, zoom out
                    else if (f0f1Dist < lastf0f1Dist && zoomDistance < zoomFarLimit) {
                        zoomSpeed += (pinchDelta + pinchDelta * distWeight) * Time.deltaTime * zoomScreenToWorldRatio;
                    }
                }

                // detect twist
                if (f0Delta.magnitude > 2 && f1Delta.magnitude > 2) {

                    // homemade algorithm works, but needs code review
                    Vector3 fingersDir = (f1Pos - f0Pos).normalized;
                    Vector3 twistNormal = Vector3.Cross(fingersDir, Vector3.forward);
                    Vector3 twistAxis = Vector3.Cross(fingersDir, twistNormal);
                    float averageDelta = (f0Delta.magnitude + f1Delta.magnitude) / 2;
                    if (Vector3.Dot(f0Dir, twistNormal) > 0.7f) {
                        twistSpeed =  twistAxis.z * averageDelta * Time.deltaTime * twistScreenToWorldRatio;
                    }
                    else if (Vector3.Dot(f0Dir, twistNormal) < -0.7f) {
                        twistSpeed = -twistAxis.z * averageDelta * Time.deltaTime * twistScreenToWorldRatio;
                    }
                }
            }
        }

        // record last distance, for delta distances
        lastf0f1Dist = f0f1Dist;

        // decelerate zoom speed
        zoomSpeed = zoomSpeed * (1 - Time.deltaTime * 10);
    }