X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Finput%2Fgesturedetector.cpp;h=08232cf8f0fecf023e98fe43b452d2bf9135ee0e;hb=5658e0f743064cc1c8ca77aed86891b8e803e0d7;hp=d626c5d08efc6dcbd909083651045c7f056c98db;hpb=2d8e49766252749ef586ffd988c9858666c01995;p=libs%2Fgui.git

diff --git a/source/input/gesturedetector.cpp b/source/input/gesturedetector.cpp
index d626c5d..08232cf 100644
--- a/source/input/gesturedetector.cpp
+++ b/source/input/gesturedetector.cpp
@@ -1,6 +1,7 @@
+#define _USE_MATH_DEFINES
+#include "gesturedetector.h"
 #include <cmath>
 #include <sigc++/bind_return.h>
-#include "gesturedetector.h"
 #include "touchscreen.h"
 
 using namespace std;
@@ -9,10 +10,8 @@ namespace Msp {
 namespace Input {
 
 GestureDetector::GestureDetector(Touchscreen &ts):
-	touchscreen(ts),
-	current_gesture(GESTURE_NONE),
-	active_points(0),
-	invalid_gesture(false)
+	Device(UNSPECIFIED),
+	touchscreen(ts)
 {
 	name = "Gesture";
 
@@ -26,16 +25,22 @@ 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_TAP)
+		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)
+		return "Rotate";
 	else
 		return Device::get_button_name(btn);
 }
@@ -47,7 +52,9 @@ string GestureDetector::get_axis_name(unsigned axis) const
 	else if(axis==1)
 		return "Y";
 	else if(axis==2)
-		return "Progress";
+		return "Delta X";
+	else if(axis==3)
+		return "Delta Y";
 	else
 		return Device::get_axis_name(axis);
 }
@@ -64,6 +71,16 @@ 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;
+		else if(btn==2)
+			pending_tap = GESTURE_TAP_3;
+	}
 }
 
 void GestureDetector::touch_up(unsigned btn)
@@ -76,7 +93,7 @@ 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)
@@ -85,6 +102,15 @@ 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)
+		{
+			set_gesture_location(gesture_points(pending_tap));
+			set_button_state(pending_tap, true, true);
+			set_button_state(pending_tap, false, true);
+
+			pending_tap = GESTURE_NONE;
+		}
 	}
 }
 
@@ -104,11 +130,14 @@ 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();
-		else if(active_points&(1<<i))
+		else if(i<gesture_points(current_gesture))
 			update_progress();
 	}
 }
@@ -119,16 +148,31 @@ 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;
@@ -141,54 +185,62 @@ 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;
+	}
+	else
+		current_gesture = GESTURE_DRAG;
 
-		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);
-		}
+	if(current_gesture!=GESTURE_NONE)
+	{
+		set_gesture_location(gesture_points(current_gesture));
+		update_progress();
+		set_button_state(current_gesture, true, true);
 	}
 	else
+		invalid_gesture = true;
+}
+
+void GestureDetector::set_gesture_location(unsigned n_points)
+{
+	float x = 0;
+	float y = 0;
+	for(unsigned i=0; i<n_points; ++i)
 	{
-		// Allow a maximum deviation of about 26° to recognize a swipe gesture.
-		if(abs(p.x)>2*abs(p.y))
-			current_gesture = (p.x>0 ? GESTURE_SWIPE_RIGHT : GESTURE_SWIPE_LEFT);
-		else if(abs(p.y)>2*abs(p.x))
-			current_gesture = (p.y>0 ? GESTURE_SWIPE_UP : GESTURE_SWIPE_DOWN);
-		else
-			invalid_gesture = true;
-
-		if(current_gesture!=GESTURE_NONE)
-		{
-			active_points = 1;
-			set_axis_value(0, p.down_x, true);
-			set_axis_value(1, p.down_y, true);
-		}
+		x += points[i].down_x;
+		y += points[i].down_y;
 	}
 
-	update_progress();
+	set_axis_value(0, x/n_points, true);
+	set_axis_value(1, y/n_points, true);
+}
 
-	if(current_gesture!=GESTURE_NONE)
-		set_button_state(current_gesture, true, true);
+void GestureDetector::set_gesture_delta(unsigned n_points)
+{
+	float x = 0;
+	float y = 0;
+	for(unsigned i=0; i<n_points; ++i)
+	{
+		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()
 {
-	TouchPoint &p = points[0];
-
-	if(current_gesture==GESTURE_SWIPE_DOWN)
-		set_axis_value(2, -p.y, true);
-	else if(current_gesture==GESTURE_SWIPE_UP)
-		set_axis_value(2, p.y, true);
-	else if(current_gesture==GESTURE_SWIPE_LEFT)
-		set_axis_value(2, -p.x, true);
-	else if(current_gesture==GESTURE_SWIPE_RIGHT)
-		set_axis_value(2, p.x, true);
-	else if(current_gesture==GESTURE_PINCH)
+	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. */
@@ -196,7 +248,16 @@ 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);
+		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);
+		}
 	}
 }
 
@@ -205,7 +266,7 @@ 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)
@@ -220,8 +281,27 @@ GestureDetector::TouchPoint::TouchPoint():
 	down_x(0),
 	down_y(0),
 	x(0),
-	y(0)
+	y(0),
+	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