X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Finput%2Fgesturedetector.cpp;h=97e3d56f0fc53a3e4a7eb0e271a2a0c060303603;hb=81a662b025809d71d8dc67a2108ad7d54ba7c645;hp=145262a762ce438d03bb777ca1ed06fc325c7607;hpb=ab03781d9d893bb50a1947cbef6ef2c35ae10d16;p=libs%2Fgui.git

diff --git a/source/input/gesturedetector.cpp b/source/input/gesturedetector.cpp
index 145262a..97e3d56 100644
--- a/source/input/gesturedetector.cpp
+++ b/source/input/gesturedetector.cpp
@@ -12,7 +12,6 @@ namespace Input {
 GestureDetector::GestureDetector(Touchscreen &ts):
 	touchscreen(ts),
 	current_gesture(GESTURE_NONE),
-	active_points(0),
 	pending_tap(GESTURE_NONE),
 	invalid_gesture(false)
 {
@@ -32,10 +31,14 @@ string GestureDetector::get_button_name(unsigned btn) const
 		return "Tap";
 	else if(btn==GESTURE_TAP_2)
 		return "Two-finger tap";
+	else if(btn==GESTURE_TAP_3)
+		return "Three-finger tap";
 	else if(btn==GESTURE_DRAG)
 		return "Drag";
 	else if(btn==GESTURE_DRAG_2)
 		return "Two-finger drag";
+	else if(btn==GESTURE_DRAG_3)
+		return "Three-finger drag";
 	else if(btn==GESTURE_PINCH)
 		return "Pinch";
 	else if(btn==GESTURE_ROTATE)
@@ -77,6 +80,8 @@ void GestureDetector::touch_down(unsigned btn)
 			pending_tap = GESTURE_TAP;
 		else if(btn==1)
 			pending_tap = GESTURE_TAP_2;
+		else if(btn==2)
+			pending_tap = GESTURE_TAP_3;
 	}
 }
 
@@ -90,7 +95,7 @@ void GestureDetector::touch_up(unsigned btn)
 	p.y += p.down_y;
 	p.down = false;
 
-	if(active_points&(1<<btn))
+	if(btn<gesture_points(current_gesture))
 		end_gesture();
 
 	if(current_gesture==GESTURE_NONE)
@@ -102,8 +107,7 @@ void GestureDetector::touch_up(unsigned btn)
 
 		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_gesture_location(gesture_points(pending_tap));
 			set_button_state(pending_tap, true, true);
 			set_button_state(pending_tap, false, true);
 
@@ -135,7 +139,7 @@ void GestureDetector::touch_move(unsigned axis, float value, float)
 
 		if(current_gesture==GESTURE_NONE && !invalid_gesture)
 			start_gesture();
-		else if(active_points&(1<<i))
+		else if(i<gesture_points(current_gesture))
 			update_progress();
 	}
 }
@@ -146,16 +150,31 @@ void GestureDetector::start_gesture()
 	if(!p.down)
 		return;
 
-	/* 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);
+	/* All held points need to have moved more than the threshold to start the
+	gesture. */
+	bool threshold_exceeded = true;
+	for(unsigned i=0; (i<MAX_POINTS && threshold_exceeded); ++i)
+		if(points[i].down && !points[i].threshold_exceeded)
+			threshold_exceeded = false;
 	if(!threshold_exceeded)
 		return;
 
 	invalid_gesture = false;
-	if(points[1].down)
+	if(points[2].down)
+	{
+		bool same_direction = true;
+		for(unsigned i=0; (same_direction && i<2); ++i)
+			for(unsigned j=i+1; (same_direction && j<3); ++j)
+			{
+				TouchPoint &pi = points[i];
+				TouchPoint &pj = points[j];
+				same_direction = ((pi.x*pj.x+pi.y*pj.y)>2*abs(pi.x*pj.y-pi.y*pj.x));
+			}
+
+		if(same_direction)
+			current_gesture = GESTURE_DRAG_3;
+	}
+	else if(points[1].down)
 	{
 		TouchPoint &p2 = points[1];
 		float ddx = p.down_x-p2.down_x;
@@ -175,20 +194,13 @@ void GestureDetector::start_gesture()
 		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;
 	}
 	else
-	{
 		current_gesture = GESTURE_DRAG;
-		active_points = 1;
-	}
-
 
 	if(current_gesture!=GESTURE_NONE)
 	{
-		set_gesture_location(active_points);
+		set_gesture_location(gesture_points(current_gesture));
 		update_progress();
 		set_button_state(current_gesture, true, true);
 	}
@@ -196,40 +208,41 @@ void GestureDetector::start_gesture()
 		invalid_gesture = true;
 }
 
-void GestureDetector::set_gesture_location(unsigned mask)
+void GestureDetector::set_gesture_location(unsigned n_points)
 {
 	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;
-		}
+	for(unsigned i=0; i<n_points; ++i)
+	{
+		x += points[i].down_x;
+		y += points[i].down_y;
+	}
 
-	set_axis_value(0, x/count, true);
-	set_axis_value(1, y/count, true);
+	set_axis_value(0, x/n_points, true);
+	set_axis_value(1, y/n_points, true);
 }
 
-void GestureDetector::update_progress()
+void GestureDetector::set_gesture_delta(unsigned n_points)
 {
-	TouchPoint &p = points[0];
-
-	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)
+	float x = 0;
+	float y = 0;
+	for(unsigned i=0; i<n_points; ++i)
 	{
-		TouchPoint &p2 = points[1];
-		set_axis_value(2, (p.x+p2.x)/2, true);
-		set_axis_value(3, (p.y+p2.y)/2, true);
+		x += points[i].x;
+		y += points[i].y;
 	}
+
+	set_axis_value(2, x/n_points, true);
+	set_axis_value(3, y/n_points, true);
+}
+
+void GestureDetector::update_progress()
+{
+	if(current_gesture>=GESTURE_DRAG && current_gesture<=GESTURE_DRAG_3)
+		set_gesture_delta(gesture_points(current_gesture));
 	else if(current_gesture==GESTURE_PINCH || current_gesture==GESTURE_ROTATE)
 	{
+		TouchPoint &p = points[0];
 		TouchPoint &p2 = points[1];
 		/* Pinch progress is the ratio between the current distance of the points
 		and their distance when they were pressed. */
@@ -255,7 +268,6 @@ 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;
 }
 
@@ -275,5 +287,23 @@ GestureDetector::TouchPoint::TouchPoint():
 	threshold_exceeded(false)
 { }
 
+
+unsigned gesture_points(Gesture gesture)
+{
+	switch(gesture)
+	{
+	case GESTURE_NONE: return 0;
+	case GESTURE_TAP: return 1;
+	case GESTURE_TAP_2: return 2;
+	case GESTURE_TAP_3: return 3;
+	case GESTURE_DRAG: return 1;
+	case GESTURE_DRAG_2: return 2;
+	case GESTURE_DRAG_3: return 3;
+	case GESTURE_PINCH: return 2;
+	case GESTURE_ROTATE: return 2;
+	default: throw invalid_argument("gesture_points");
+	}
+}
+
 } // namespace Input
 } // namespace Msp