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Android - Virtual Pad - Limit joystick inside base circle.

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This commit is contained in:
Cristian Luis Duarte 2018-03-01 17:58:23 -03:00
parent 9acb83632c
commit b5c3b78d57
2 changed files with 80 additions and 23 deletions
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98
libraries/input-plugins/src/input-plugins/TouchscreenVirtualPadDevice.cpp
View file

@ -50,6 +50,7 @@ void TouchscreenVirtualPadDevice::init() {
_screenDPI = eventScreen->physicalDotsPerInch();
_fixedRadius = _screenDPI * 256 / 534;
_fixedRadiusForCalc = _fixedRadius - _screenDPI * 105 / 534; // 105 is the radius of the stick circle
}
auto& virtualPadManager = VirtualPad::Manager::instance();
@ -79,6 +80,79 @@ float clip(float n, float lower, float upper) {
return std::max(lower, std::min(n, upper));
}
glm::vec2 TouchscreenVirtualPadDevice::clippedPointInCircle(float radius, glm::vec2 origin, glm::vec2 touchPoint) {
float deltaX = touchPoint.x-origin.x;
float deltaY = touchPoint.y-origin.y;
float distance = sqrt(pow(deltaX,2)+pow(deltaY,2));
// First case, inside the boundaires, just use the distance
if (distance <= radius) {
return touchPoint;
}
// Second case, purely vertical (avoid division by zero)
if (deltaX == 0.0f) {
return vec2(touchPoint.x, clip(touchPoint.y, origin.y-radius, origin.y+radius) );
}
// Third case, calculate point in circumference
// line formula
float m = deltaY/deltaX;
float b = touchPoint.y - m * touchPoint.x;
// quadtratic coefs of circumference and line intersection
float qa = pow(m,2)+1;
float qb = 2 * ( m * b - origin.x - origin.y * m );
float qc = pow(origin.x, 2) - pow(radius,2) + b * b - 2 * b * origin.y + pow(origin.y, 2);
float discr = qb * qb - 4 * qa * qc;
float discrSign = deltaX>0?1.0:-1.0;
float finalX = (- qb + discrSign * sqrt(discr)) / (2 * qa);
float finalY = m * finalX + b;
return vec2(finalX, finalY);
}
void TouchscreenVirtualPadDevice::processInputUseCircleMethod(VirtualPad::Manager& virtualPadManager) {
vec2 clippedPoint = clippedPointInCircle(_fixedRadiusForCalc, _firstTouchLeftPoint, _currentTouchLeftPoint);
_inputDevice->_axisStateMap[controller::LX] = (clippedPoint.x - _firstTouchLeftPoint.x) / _fixedRadiusForCalc;
_inputDevice->_axisStateMap[controller::LY] = (clippedPoint.y - _firstTouchLeftPoint.y) / _fixedRadiusForCalc;
virtualPadManager.getLeftVirtualPad()->setFirstTouch(_firstTouchLeftPoint);
virtualPadManager.getLeftVirtualPad()->setCurrentTouch(clippedPoint);
virtualPadManager.getLeftVirtualPad()->setBeingTouched(true);
virtualPadManager.getLeftVirtualPad()->setShown(true); // If touched, show in any mode (fixed joystick position or non-fixed)
}
void TouchscreenVirtualPadDevice::processInputUseSquareMethod(VirtualPad::Manager& virtualPadManager) {
float leftDistanceScaleX, leftDistanceScaleY;
leftDistanceScaleX = (_currentTouchLeftPoint.x - _firstTouchLeftPoint.x) / _screenDPIScale.x;
leftDistanceScaleY = (_currentTouchLeftPoint.y - _firstTouchLeftPoint.y) / _screenDPIScale.y;
leftDistanceScaleX = clip(leftDistanceScaleX, -STICK_RADIUS_INCHES, STICK_RADIUS_INCHES);
leftDistanceScaleY = clip(leftDistanceScaleY, -STICK_RADIUS_INCHES, STICK_RADIUS_INCHES);
// NOW BETWEEN -1 1
leftDistanceScaleX /= STICK_RADIUS_INCHES;
leftDistanceScaleY /= STICK_RADIUS_INCHES;
_inputDevice->_axisStateMap[controller::LX] = leftDistanceScaleX;
_inputDevice->_axisStateMap[controller::LY] = leftDistanceScaleY;
/* Shared variables for stick rendering (clipped to the stick radius)*/
// Prevent this for being done when not in first person view
virtualPadManager.getLeftVirtualPad()->setFirstTouch(_firstTouchLeftPoint);
virtualPadManager.getLeftVirtualPad()->setCurrentTouch(
glm::vec2(clip(_currentTouchLeftPoint.x, -STICK_RADIUS_INCHES * _screenDPIScale.x + _firstTouchLeftPoint.x, STICK_RADIUS_INCHES * _screenDPIScale.x + _firstTouchLeftPoint.x),
clip(_currentTouchLeftPoint.y, -STICK_RADIUS_INCHES * _screenDPIScale.y + _firstTouchLeftPoint.y, STICK_RADIUS_INCHES * _screenDPIScale.y + _firstTouchLeftPoint.y))
);
virtualPadManager.getLeftVirtualPad()->setBeingTouched(true);
virtualPadManager.getLeftVirtualPad()->setShown(true); // If touched, show in any mode (fixed joystick position or non-fixed)
}
void TouchscreenVirtualPadDevice::pluginUpdate(float deltaTime, const controller::InputCalibrationData& inputCalibrationData) {
auto userInputMapper = DependencyManager::get<controller::UserInputMapper>();
userInputMapper->withLock([&, this]() {
@ -89,29 +163,7 @@ void TouchscreenVirtualPadDevice::pluginUpdate(float deltaTime, const controller
setupFixedCenter(virtualPadManager);
if (_validTouchLeft) {
float leftDistanceScaleX, leftDistanceScaleY;
leftDistanceScaleX = (_currentTouchLeftPoint.x - _firstTouchLeftPoint.x) / _screenDPIScale.x;
leftDistanceScaleY = (_currentTouchLeftPoint.y - _firstTouchLeftPoint.y) / _screenDPIScale.y;
leftDistanceScaleX = clip(leftDistanceScaleX, -STICK_RADIUS_INCHES, STICK_RADIUS_INCHES);
leftDistanceScaleY = clip(leftDistanceScaleY, -STICK_RADIUS_INCHES, STICK_RADIUS_INCHES);
// NOW BETWEEN -1 1
leftDistanceScaleX /= STICK_RADIUS_INCHES;
leftDistanceScaleY /= STICK_RADIUS_INCHES;
_inputDevice->_axisStateMap[controller::LX] = leftDistanceScaleX;
_inputDevice->_axisStateMap[controller::LY] = leftDistanceScaleY;
/* Shared variables for stick rendering (clipped to the stick radius)*/
// Prevent this for being done when not in first person view
virtualPadManager.getLeftVirtualPad()->setFirstTouch(_firstTouchLeftPoint);
virtualPadManager.getLeftVirtualPad()->setCurrentTouch(
glm::vec2(clip(_currentTouchLeftPoint.x, -STICK_RADIUS_INCHES * _screenDPIScale.x + _firstTouchLeftPoint.x, STICK_RADIUS_INCHES * _screenDPIScale.x + _firstTouchLeftPoint.x),
clip(_currentTouchLeftPoint.y, -STICK_RADIUS_INCHES * _screenDPIScale.y + _firstTouchLeftPoint.y, STICK_RADIUS_INCHES * _screenDPIScale.y + _firstTouchLeftPoint.y))
);
virtualPadManager.getLeftVirtualPad()->setBeingTouched(true);
virtualPadManager.getLeftVirtualPad()->setShown(true); // If touched, show in any mode (fixed joystick position or non-fixed)
processInputUseCircleMethod(virtualPadManager);
} else {
virtualPadManager.getLeftVirtualPad()->setBeingTouched(false);
if (_fixedPosition) {

5
libraries/input-plugins/src/input-plugins/TouchscreenVirtualPadDevice.h
View file

@ -79,6 +79,7 @@ protected:
bool _fixedPosition;
glm::vec2 _fixedCenterPosition;
qreal _fixedRadius;
qreal _fixedRadiusForCalc;
int _extraBottomMargin {0};
void touchLeftBegin(glm::vec2 touchPoint);
@ -89,6 +90,10 @@ protected:
void touchRightUpdate(glm::vec2 touchPoint);
void touchRightEnd();
void setupFixedCenter(VirtualPad::Manager& virtualPadManager, bool force = false);
void processInputUseCircleMethod(VirtualPad::Manager& virtualPadManager);
void processInputUseSquareMethod(VirtualPad::Manager& virtualPadManager);
glm::vec2 clippedPointInCircle(float radius, glm::vec2 origin, glm::vec2 touchPoint);
// just for debug
private:
void debugPoints(const QTouchEvent* event, QString who);