X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Finput%2Fgesturedetector.cpp;h=49ddba2b8478173dfbd65b9e80233ab356c0da03;hb=1d418a1547bcea8b983815403d0a07b62793a460;hp=cc027973fdc868a319bdce0fe5db5b312ed742a5;hpb=a5be5c703808817dda8feafb03b0aec04b20afbb;p=libs%2Fgui.git

diff --git a/source/input/gesturedetector.cpp b/source/input/gesturedetector.cpp
index cc02797..49ddba2 100644
--- a/source/input/gesturedetector.cpp
+++ b/source/input/gesturedetector.cpp
@@ -1,3 +1,4 @@
+#define _USE_MATH_DEFINES
 #include <cmath>
 #include <sigc++/bind_return.h>
 #include "gesturedetector.h"
@@ -12,6 +13,7 @@ GestureDetector::GestureDetector(Touchscreen &ts):
 	touchscreen(ts),
 	current_gesture(GESTURE_NONE),
 	active_points(0),
+	pending_tap(GESTURE_NONE),
 	invalid_gesture(false)
 {
 	name = "Gesture";
@@ -28,8 +30,12 @@ string GestureDetector::get_button_name(unsigned btn) const
 {
 	if(btn==GESTURE_DRAG)
 		return "Drag";
+	else if(btn==GESTURE_DRAG_2)
+		return "Two-finger drag";
 	else if(btn==GESTURE_PINCH)
 		return "Pinch";
+	else if(btn==GESTURE_ROTATE)
+		return "Rotate";
 	else
 		return Device::get_button_name(btn);
 }
@@ -58,6 +64,14 @@ void GestureDetector::touch_down(unsigned btn)
 	p.x = 0;
 	p.y = 0;
 	p.threshold_exceeded = false;
+
+	if(current_gesture==GESTURE_NONE && !invalid_gesture)
+	{
+		if(btn==0)
+			pending_tap = GESTURE_TAP;
+		else if(btn==1)
+			pending_tap = GESTURE_TAP_2;
+	}
 }
 
 void GestureDetector::touch_up(unsigned btn)
@@ -79,6 +93,16 @@ void GestureDetector::touch_up(unsigned btn)
 		invalid_gesture = false;
 		for(unsigned i=0; (i<MAX_POINTS && !invalid_gesture); ++i)
 			invalid_gesture = points[i].down;
+
+		if(!invalid_gesture && pending_tap!=GESTURE_NONE)
+		{
+			unsigned n_points = min<unsigned>((pending_tap-GESTURE_TAP)+1, MAX_POINTS);
+			set_gesture_location((1<<n_points)-1);
+			set_button_state(pending_tap, true, true);
+			set_button_state(pending_tap, false, true);
+
+			pending_tap = GESTURE_NONE;
+		}
 	}
 }
 
@@ -98,7 +122,10 @@ void GestureDetector::touch_move(unsigned axis, float value, float)
 	if(p.down)
 	{
 		if(p.x*p.x/threshold_x_sq+p.y*p.y/threshold_y_sq>=1)
+		{
 			p.threshold_exceeded = true;
+			pending_tap = GESTURE_NONE;
+		}
 
 		if(current_gesture==GESTURE_NONE && !invalid_gesture)
 			start_gesture();
@@ -135,28 +162,49 @@ void GestureDetector::start_gesture()
 			/* If the points moved away from or towards each other without rotating
 			significantly, it's a pinch gesture. */
 			current_gesture = GESTURE_PINCH;
-		else
-			invalid_gesture = true;
+		else if(turn*turn2>0 && abs(turn)>abs(away) && abs(turn2)>abs(away2))
+			/* If the points both turned in the same direction without significant
+			changes in distance, it's a rotate gesture. */
+			current_gesture = GESTURE_ROTATE;
+		else if((p.x*p2.x+p.y*p2.y)>2*abs(p.x*p2.y-p.y*p2.x))
+			// If both points moved in the same direction, it's a two-finger drag.
+			current_gesture = GESTURE_DRAG_2;
 
 		if(current_gesture!=GESTURE_NONE)
-		{
 			active_points = 3;
-			set_axis_value(0, (p.down_x+p2.down_x)/2, true);
-			set_axis_value(1, (p.down_y+p2.down_y)/2, true);
-		}
 	}
 	else
 	{
 		current_gesture = GESTURE_DRAG;
 		active_points = 1;
-		set_axis_value(0, p.down_x, true);
-		set_axis_value(1, p.down_y, true);
 	}
 
-	update_progress();
 
 	if(current_gesture!=GESTURE_NONE)
+	{
+		set_gesture_location(active_points);
+		update_progress();
 		set_button_state(current_gesture, true, true);
+	}
+	else
+		invalid_gesture = true;
+}
+
+void GestureDetector::set_gesture_location(unsigned mask)
+{
+	float x = 0;
+	float y = 0;
+	unsigned count = 0;
+	for(unsigned i=0; i<MAX_POINTS; ++i)
+		if(mask&(1<<i))
+		{
+			x += points[i].down_x;
+			y += points[i].down_y;
+			++count;
+		}
+
+	set_axis_value(0, x/count, true);
+	set_axis_value(1, y/count, true);
 }
 
 void GestureDetector::update_progress()
@@ -168,7 +216,13 @@ void GestureDetector::update_progress()
 		set_axis_value(2, p.x, true);
 		set_axis_value(3, p.y, true);
 	}
-	else if(current_gesture==GESTURE_PINCH)
+	else if(current_gesture==GESTURE_DRAG_2)
+	{
+		TouchPoint &p2 = points[1];
+		set_axis_value(2, (p.x+p2.x)/2, true);
+		set_axis_value(3, (p.y+p2.y)/2, true);
+	}
+	else if(current_gesture==GESTURE_PINCH || current_gesture==GESTURE_ROTATE)
 	{
 		TouchPoint &p2 = points[1];
 		/* Pinch progress is the ratio between the current distance of the points
@@ -177,8 +231,16 @@ void GestureDetector::update_progress()
 		float ddy = p.down_y-p2.down_y;
 		float dx = ddx+p.x-p2.x;
 		float dy = ddy+p.y-p2.y;
-		set_axis_value(2, sqrt(dx*dx+dy*dy)/sqrt(ddx*ddx+ddy*ddy)-1, true);
-		set_axis_value(3, 0, true);
+		if(current_gesture==GESTURE_PINCH)
+		{
+			set_axis_value(2, sqrt(dx*dx+dy*dy)/sqrt(ddx*ddx+ddy*ddy)-1, true);
+			set_axis_value(3, 0, true);
+		}
+		else if(current_gesture==GESTURE_ROTATE)
+		{
+			set_axis_value(2, atan2(dy*ddx-dx*ddy, dx*ddx+dy*ddy)/M_PI/2, true);
+			set_axis_value(3, 0, true);
+		}
 	}
 }
 
@@ -188,6 +250,7 @@ void GestureDetector::end_gesture()
 	set_axis_value(2, 0, false);
 	current_gesture = GESTURE_NONE;
 	active_points = 0;
+	pending_tap = GESTURE_NONE;
 }
 
 void GestureDetector::window_resized(unsigned w, unsigned h)
@@ -202,7 +265,8 @@ GestureDetector::TouchPoint::TouchPoint():
 	down_x(0),
 	down_y(0),
 	x(0),
-	y(0)
+	y(0),
+	threshold_exceeded(false)
 { }
 
 } // namespace Input