ppsspp/input/gesture_detector.cpp

// Unfinished.
// TODO:
// Zoom gesture a la http://www.zdnet.com/blog/burnette/how-to-use-multi-touch-in-android-2-part-6-implementing-the-pinch-zoom-gesture/1847

#include "input/gesture_detector.h"

namespace GestureDetector {

struct Finger {
  bool down;
  float X;
  float Y;
  float lastX;
  float lastY;
  float downX;
  float downY;
  float deltaX;
  float deltaY;
  float smoothDeltaX;
  float smoothDeltaY;
};

// State
#define MAX_FINGERS 4

static Finger fingers[MAX_FINGERS];

void update(const InputState &state) {
  // Mouse / 1-finger-touch control.
  if (state.pointer_down[0]) {
    fingers[0].down = true;
    fingers[0].downX = state.pointer_x[0];
    fingers[0].downY = state.pointer_y[0];
  } else {
    fingers[0].down = false;
  }

  fingers[0].lastX = fingers[0].X;
  fingers[0].lastY = fingers[0].Y;

  // TODO: real multitouch
}

bool down(int i, float *xdelta, float *ydelta) {
  if (!fingers[i].down) {
    return false;
  }
  *xdelta = fingers[i].downX;
  *ydelta = fingers[i].downY;
  return true;
}

bool dragDistance(int i, float *xdelta, float *ydelta) {
  if (!fingers[i].down)
    return false;

  *xdelta = fingers[i].X - fingers[i].downX;
  *ydelta = fingers[i].Y - fingers[i].downY;
  return true;
}

bool dragDelta(int i, float *xdelta, float *ydelta) {
  if (!fingers[i].down)
    return false;

  *xdelta = fingers[i].X - fingers[i].lastX;
  *ydelta = fingers[i].Y - fingers[i].lastY;
  return true;
}

}