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Moved Multi finger gesture recognition into the library.
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Original file line number | Diff line number | Diff line change |
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/* | ||
SDL - Simple DirectMedia Layer | ||
Copyright (C) 1997-2010 Sam Lantinga | ||
This library is free software; you can redistribute it and/or | ||
modify it under the terms of the GNU Lesser General Public | ||
License as published by the Free Software Foundation; either | ||
version 2.1 of the License, or (at your option) any later version. | ||
This library is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
Lesser General Public License for more details. | ||
You should have received a copy of the GNU Lesser General Public | ||
License along with this library; if not, write to the Free Software | ||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
Sam Lantinga | ||
slouken@libsdl.org | ||
*/ | ||
#include "SDL_config.h" | ||
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/* General mouse handling code for SDL */ | ||
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#include "SDL_events.h" | ||
#include "SDL_events_c.h" | ||
#include "SDL_gesture_c.h" | ||
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//TODO: Replace with malloc | ||
#define MAXFINGERS 3 | ||
#define MAXTOUCHES 2 | ||
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typedef struct { | ||
float x,y; | ||
} Point; | ||
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typedef struct { | ||
Point p; | ||
float pressure; | ||
int id; | ||
} Finger; | ||
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typedef struct { | ||
Finger f; | ||
Point cv; | ||
float dtheta,dDist; | ||
} TouchPoint; | ||
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typedef struct { | ||
int id; | ||
Point res; | ||
Point centroid; | ||
TouchPoint gestureLast[MAXFINGERS]; | ||
int numDownFingers; | ||
} GestureTouch; | ||
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GestureTouch gestureTouch[MAXTOUCHES]; | ||
int numGestureTouches = 0; | ||
int SDL_GestureAddTouch(SDL_Touch* touch) { | ||
if(numGestureTouches >= MAXTOUCHES) return -1; | ||
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gestureTouch[numGestureTouches].res.x = touch->xres; | ||
gestureTouch[numGestureTouches].res.y = touch->yres; | ||
gestureTouch[numGestureTouches].numDownFingers = 0; | ||
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gestureTouch[numGestureTouches].res.x = touch->xres; | ||
gestureTouch[numGestureTouches].id = touch->id; | ||
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numGestureTouches++; | ||
return 0; | ||
} | ||
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GestureTouch * SDL_GetGestureTouch(int id) { | ||
int i; | ||
for(i = 0;i < numGestureTouches; i++) { | ||
//printf("%i ?= %i\n",gestureTouch[i].id,id); | ||
if(gestureTouch[i].id == id) return &gestureTouch[i]; | ||
} | ||
return NULL; | ||
} | ||
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int SDL_SendGestureMulti(GestureTouch* touch,float dTheta,float dDist) { | ||
SDL_Event event; | ||
event.mgesture.type = SDL_MULTIGESTURE; | ||
event.mgesture.touchId = touch->id; | ||
event.mgesture.x = touch->centroid.x; | ||
event.mgesture.y = touch->centroid.y; | ||
event.mgesture.dTheta = dTheta; | ||
event.mgesture.dDist = dDist; | ||
return SDL_PushEvent(&event) > 0; | ||
} | ||
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void SDL_GestureProcessEvent(SDL_Event* event) | ||
{ | ||
if(event->type == SDL_FINGERMOTION || | ||
event->type == SDL_FINGERDOWN || | ||
event->type == SDL_FINGERUP) { | ||
GestureTouch* inTouch = SDL_GetGestureTouch(event->tfinger.touchId); | ||
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//Shouldn't be possible | ||
if(inTouch == NULL) return; | ||
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float x = ((float)event->tfinger.x)/inTouch->res.x; | ||
float y = ((float)event->tfinger.y)/inTouch->res.y; | ||
int j,empty = -1; | ||
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for(j = 0;j<inTouch->numDownFingers;j++) { | ||
if(inTouch->gestureLast[j].f.id != event->tfinger.fingerId) continue; | ||
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if(event->type == SDL_FINGERUP) { | ||
inTouch->numDownFingers--; | ||
inTouch->gestureLast[j] = inTouch->gestureLast[inTouch->numDownFingers]; | ||
break; | ||
} | ||
else { | ||
float dx = x - inTouch->gestureLast[j].f.p.x; | ||
float dy = y - inTouch->gestureLast[j].f.p.y; | ||
inTouch->centroid.x += dx/inTouch->numDownFingers; | ||
inTouch->centroid.y += dy/inTouch->numDownFingers; | ||
if(inTouch->numDownFingers > 1) { | ||
Point lv; //Vector from centroid to last x,y position | ||
Point v; //Vector from centroid to current x,y position | ||
lv = inTouch->gestureLast[j].cv; | ||
float lDist = sqrt(lv.x*lv.x + lv.y*lv.y); | ||
//printf("lDist = %f\n",lDist); | ||
v.x = x - inTouch->centroid.x; | ||
v.y = y - inTouch->centroid.y; | ||
inTouch->gestureLast[j].cv = v; | ||
float Dist = sqrt(v.x*v.x+v.y*v.y); | ||
// cos(dTheta) = (v . lv)/(|v| * |lv|) | ||
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//Normalize Vectors to simplify angle calculation | ||
lv.x/=lDist; | ||
lv.y/=lDist; | ||
v.x/=Dist; | ||
v.y/=Dist; | ||
float dtheta = atan2(lv.x*v.y - lv.y*v.x,lv.x*v.x + lv.y*v.y); | ||
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float dDist = (Dist - lDist); | ||
if(lDist == 0) {dDist = 0;dtheta = 0;} //To avoid impossible values | ||
inTouch->gestureLast[j].dDist = dDist; | ||
inTouch->gestureLast[j].dtheta = dtheta; | ||
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//printf("dDist = %f, dTheta = %f\n",dDist,dtheta); | ||
//gdtheta = gdtheta*.9 + dtheta*.1; | ||
//gdDist = gdDist*.9 + dDist*.1 | ||
//knob.r += dDist/numDownFingers; | ||
//knob.ang += dtheta; | ||
//printf("thetaSum = %f, distSum = %f\n",gdtheta,gdDist); | ||
//printf("id: %i dTheta = %f, dDist = %f\n",j,dtheta,dDist); | ||
SDL_SendGestureMulti(inTouch,dtheta,dDist); | ||
} | ||
else { | ||
inTouch->gestureLast[j].dDist = 0; | ||
inTouch->gestureLast[j].dtheta = 0; | ||
inTouch->gestureLast[j].cv.x = 0; | ||
inTouch->gestureLast[j].cv.y = 0; | ||
} | ||
inTouch->gestureLast[j].f.p.x = x; | ||
inTouch->gestureLast[j].f.p.y = y; | ||
break; | ||
//pressure? | ||
} | ||
} | ||
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if(j == inTouch->numDownFingers) { | ||
//printf("Finger Down!!!\n"); | ||
inTouch->numDownFingers++; | ||
inTouch->centroid.x = (inTouch->centroid.x*(inTouch->numDownFingers - 1)+ | ||
x)/inTouch->numDownFingers; | ||
inTouch->centroid.y = (inTouch->centroid.y*(inTouch->numDownFingers - 1)+ | ||
y)/inTouch->numDownFingers; | ||
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inTouch->gestureLast[j].f.id = event->tfinger.fingerId; | ||
inTouch->gestureLast[j].f.p.x = x; | ||
inTouch->gestureLast[j].f.p.y = y; | ||
inTouch->gestureLast[j].cv.x = 0; | ||
inTouch->gestureLast[j].cv.y = 0; | ||
} | ||
} | ||
} | ||
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/* vi: set ts=4 sw=4 expandtab: */ | ||
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,32 @@ | ||
/* | ||
SDL - Simple DirectMedia Layer | ||
Copyright (C) 1997-2010 Sam Lantinga | ||
This library is free software; you can redistribute it and/or | ||
modify it under the terms of the GNU Lesser General Public | ||
License as published by the Free Software Foundation; either | ||
version 2.1 of the License, or (at your option) any later version. | ||
This library is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
Lesser General Public License for more details. | ||
You should have received a copy of the GNU Lesser General Public | ||
License along with this library; if not, write to the Free Software | ||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
Sam Lantinga | ||
slouken@libsdl.org | ||
*/ | ||
#include "SDL_config.h" | ||
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#ifndef _SDL_gesture_c_h | ||
#define _SDL_gesture_c_h | ||
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extern void SDL_GestureProcessEvent(SDL_Event* event); | ||
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#endif /* _SDL_gesture_c_h */ | ||
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/* vi: set ts=4 sw=4 expandtab: */ |
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