X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Finput%2Fgesturedetector.cpp;h=49ddba2b8478173dfbd65b9e80233ab356c0da03;hb=1d418a1547bcea8b983815403d0a07b62793a460;hp=c43e65a0d61c5be930e2672ae356f702c8059bf9;hpb=f9ebab54c3debe98e108790be9c21f43f4de116f;p=libs%2Fgui.git

diff --git a/source/input/gesturedetector.cpp b/source/input/gesturedetector.cpp
index c43e65a..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";
@@ -26,16 +28,14 @@ GestureDetector::GestureDetector(Touchscreen &ts):
 
 string GestureDetector::get_button_name(unsigned btn) const
 {
-	if(btn==GESTURE_SWIPE_DOWN)
-		return "Swipe down";
-	else if(btn==GESTURE_SWIPE_UP)
-		return "Swipe up";
-	else if(btn==GESTURE_SWIPE_LEFT)
-		return "Swipe left";
-	else if(btn==GESTURE_SWIPE_RIGHT)
-		return "Swipe right";
+	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);
 }
@@ -54,59 +54,83 @@ string GestureDetector::get_axis_name(unsigned axis) const
 
 void GestureDetector::touch_down(unsigned btn)
 {
-	if(btn<3)
+	if(btn>=MAX_POINTS)
+		return;
+
+	TouchPoint &p = points[btn];
+	p.down = true;
+	p.down_x = p.x;
+	p.down_y = p.y;
+	p.x = 0;
+	p.y = 0;
+	p.threshold_exceeded = false;
+
+	if(current_gesture==GESTURE_NONE && !invalid_gesture)
 	{
-		TouchPoint &p = points[btn];
-		p.down = true;
-		p.down_x = p.x;
-		p.down_y = p.y;
+		if(btn==0)
+			pending_tap = GESTURE_TAP;
+		else if(btn==1)
+			pending_tap = GESTURE_TAP_2;
 	}
 }
 
 void GestureDetector::touch_up(unsigned btn)
 {
-	if(btn<3)
+	if(btn>=MAX_POINTS)
+		return;
+
+	TouchPoint &p = points[btn];
+	p.x += p.down_x;
+	p.y += p.down_y;
+	p.down = false;
+
+	if(active_points&(1<<btn))
+		end_gesture();
+
+	if(current_gesture==GESTURE_NONE)
 	{
-		TouchPoint &p = points[btn];
-		p.down = false;
+		// New gesture can't start until all points have been released.
+		invalid_gesture = false;
+		for(unsigned i=0; (i<MAX_POINTS && !invalid_gesture); ++i)
+			invalid_gesture = points[i].down;
 
-		if(active_points&(1<<btn))
+		if(!invalid_gesture && pending_tap!=GESTURE_NONE)
 		{
-			set_button_state(current_gesture, false, true);
-			set_axis_value(2, 0, false);
-			current_gesture = GESTURE_NONE;
-			active_points = 0;
-			invalid_gesture = true;
-		}
+			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);
 
-		if(invalid_gesture)
-		{
-			invalid_gesture = false;
-			for(unsigned i=0; i<3; ++i)
-				if(points[i].down)
-					invalid_gesture = true;
+			pending_tap = GESTURE_NONE;
 		}
 	}
 }
 
 void GestureDetector::touch_move(unsigned axis, float value, float)
 {
-	if(axis<6)
+	if(axis>=MAX_POINTS*2)
+		return;
+
+	unsigned i = axis>>1;
+	TouchPoint &p = points[i];
+	// Track relative position when pressed, absolute when not.
+	if(axis&1)
+		p.y = (p.down ? value-p.down_y : value);
+	else
+		p.x = (p.down ? value-p.down_x : value);
+
+	if(p.down)
 	{
-		unsigned i = axis>>1;
-		TouchPoint &p = points[i];
-		if(axis&1)
-			p.y = value;
-		else
-			p.x = value;
-
-		if(p.down)
+		if(p.x*p.x/threshold_x_sq+p.y*p.y/threshold_y_sq>=1)
 		{
-			if(current_gesture==GESTURE_NONE && !invalid_gesture)
-				start_gesture();
-			else if(active_points&(1<<i))
-				update_progress();
+			p.threshold_exceeded = true;
+			pending_tap = GESTURE_NONE;
 		}
+
+		if(current_gesture==GESTURE_NONE && !invalid_gesture)
+			start_gesture();
+		else if(active_points&(1<<i))
+			update_progress();
 	}
 }
 
@@ -116,81 +140,119 @@ void GestureDetector::start_gesture()
 	if(!p.down)
 		return;
 
-	float dx = p.x-p.down_x;
-	float dy = p.y-p.down_y;
-	if(dx*dx/threshold_x_sq+dy*dy/threshold_y_sq<1)
+	/* At least one point needs to have moved more than the threshold to start
+	the gesture. */
+	bool threshold_exceeded = false;
+	for(unsigned i=0; (i<MAX_POINTS && !threshold_exceeded); ++i)
+		threshold_exceeded = (points[i].down && points[i].threshold_exceeded);
+	if(!threshold_exceeded)
 		return;
 
 	invalid_gesture = false;
 	if(points[1].down)
 	{
 		TouchPoint &p2 = points[1];
-		float dx2 = p2.x-p2.down_x;
-		float dy2 = p2.y-p2.down_y;
 		float ddx = p.down_x-p2.down_x;
 		float ddy = p.down_y-p2.down_y;
-		/* TODO Should the second point be also required to exceeded the
-		threshold? */
-		if(dx*dx2+dy*dy2<0 && (dx*ddx+dy*ddy)*(dx2*ddx+dy2*ddy)<0)
-		{
+		float away = p.x*ddx+p.y*ddy;
+		float turn = p.y*ddx-p.x*ddy;
+		float away2 = -(p2.x*ddx+p2.y*ddy);
+		float turn2 = -(p2.y*ddx-p2.x*ddy);
+		if(away*away2>0 && abs(away)>abs(turn) && abs(away2)>abs(turn2))
+			/* If the points moved away from or towards each other without rotating
+			significantly, it's a pinch gesture. */
 			current_gesture = GESTURE_PINCH;
-			active_points = 3;
-		}
-		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)
-		{
-			set_axis_value(0, (p.down_x+p2.down_x)/2, true);
-			set_axis_value(1, (p.down_y+p2.down_y)/2, true);
-		}
+			active_points = 3;
 	}
 	else
 	{
+		current_gesture = GESTURE_DRAG;
 		active_points = 1;
-		if(abs(dx)>2*abs(dy))
-			current_gesture = (dx>0 ? GESTURE_SWIPE_RIGHT : GESTURE_SWIPE_LEFT);
-		else if(abs(dy)>2*abs(dx))
-			current_gesture = (dy>0 ? GESTURE_SWIPE_UP : GESTURE_SWIPE_DOWN);
-		else
-			invalid_gesture = true;
-
-		if(current_gesture!=GESTURE_NONE)
-		{
-			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()
 {
 	TouchPoint &p = points[0];
 
-	if(current_gesture==GESTURE_SWIPE_DOWN)
-		set_axis_value(2, p.down_y-p.y, true);
-	else if(current_gesture==GESTURE_SWIPE_UP)
-		set_axis_value(2, p.y-p.down_y, true);
-	else if(current_gesture==GESTURE_SWIPE_LEFT)
-		set_axis_value(2, p.down_x-p.x, true);
-	else if(current_gesture==GESTURE_SWIPE_RIGHT)
-		set_axis_value(2, p.x-p.down_x, true);
-	else if(current_gesture==GESTURE_PINCH)
+	if(current_gesture==GESTURE_DRAG)
+	{
+		set_axis_value(2, p.x, true);
+		set_axis_value(3, p.y, true);
+	}
+	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];
-		float dx = p.x-p2.x;
-		float dy = p.y-p2.y;
+		/* Pinch progress is the ratio between the current distance of the points
+		and their distance when they were pressed. */
 		float ddx = p.down_x-p2.down_x;
 		float ddy = p.down_y-p2.down_y;
-		set_axis_value(2, sqrt(dx*dx+dy*dy)/sqrt(ddx*ddx+ddy*ddy)-1, true);
+		float dx = ddx+p.x-p2.x;
+		float dy = ddy+p.y-p2.y;
+		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);
+		}
 	}
 }
 
+void GestureDetector::end_gesture()
+{
+	set_button_state(current_gesture, false, true);
+	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)
 {
 	threshold_x_sq = 2500.0/(w*w);
@@ -203,7 +265,8 @@ GestureDetector::TouchPoint::TouchPoint():
 	down_x(0),
 	down_y(0),
 	x(0),
-	y(0)
+	y(0),
+	threshold_exceeded(false)
 { }
 
 } // namespace Input