*initHEADmaster

1 files changed, 700 insertions, 0 deletions

diff --git a/source/3rd-party/SDL2/src/events/SDL_gesture.c b/source/3rd-party/SDL2/src/events/SDL_gesture.c
new file mode 100644
index 0000000..c3b73e0
--- /dev/null
+++ b/source/3rd-party/SDL2/src/events/SDL_gesture.c
@@ -0,0 +1,700 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "../SDL_internal.h"
+
+/* General gesture handling code for SDL */
+
+#include "SDL_events.h"
+#include "SDL_endian.h"
+#include "SDL_events_c.h"
+#include "SDL_gesture_c.h"
+
+/*
+#include <stdio.h>
+*/
+
+/* TODO: Replace with malloc */
+
+#define MAXPATHSIZE 1024
+
+#define DOLLARNPOINTS 64
+#define DOLLARSIZE 256
+
+#define ENABLE_DOLLAR
+
+#define PHI 0.618033989
+
+typedef struct {
+    float x,y;
+} SDL_FloatPoint;
+
+typedef struct {
+    float length;
+
+    int numPoints;
+    SDL_FloatPoint p[MAXPATHSIZE];
+} SDL_DollarPath;
+
+typedef struct {
+    SDL_FloatPoint path[DOLLARNPOINTS];
+    unsigned long hash;
+} SDL_DollarTemplate;
+
+typedef struct {
+    SDL_TouchID id;
+    SDL_FloatPoint centroid;
+    SDL_DollarPath dollarPath;
+    Uint16 numDownFingers;
+
+    int numDollarTemplates;
+    SDL_DollarTemplate *dollarTemplate;
+
+    SDL_bool recording;
+} SDL_GestureTouch;
+
+static SDL_GestureTouch *SDL_gestureTouch;
+static int SDL_numGestureTouches = 0;
+static SDL_bool recordAll;
+
+#if 0
+static void PrintPath(SDL_FloatPoint *path)
+{
+    int i;
+    printf("Path:");
+    for (i=0; i<DOLLARNPOINTS; i++) {
+        printf(" (%f,%f)",path[i].x,path[i].y);
+    }
+    printf("\n");
+}
+#endif
+
+int SDL_RecordGesture(SDL_TouchID touchId)
+{
+    int i;
+    if (touchId < 0) recordAll = SDL_TRUE;
+    for (i = 0; i < SDL_numGestureTouches; i++) {
+        if ((touchId < 0) || (SDL_gestureTouch[i].id == touchId)) {
+            SDL_gestureTouch[i].recording = SDL_TRUE;
+            if (touchId >= 0)
+                return 1;
+        }
+    }
+    return (touchId < 0);
+}
+
+void SDL_GestureQuit()
+{
+    SDL_free(SDL_gestureTouch);
+    SDL_gestureTouch = NULL;
+}
+
+static unsigned long SDL_HashDollar(SDL_FloatPoint* points)
+{
+    unsigned long hash = 5381;
+    int i;
+    for (i = 0; i < DOLLARNPOINTS; i++) {
+        hash = ((hash<<5) + hash) + (unsigned long)points[i].x;
+        hash = ((hash<<5) + hash) + (unsigned long)points[i].y;
+    }
+    return hash;
+}
+
+
+static int SaveTemplate(SDL_DollarTemplate *templ, SDL_RWops *dst)
+{
+    if (dst == NULL) {
+        return 0;
+    }
+
+    /* No Longer storing the Hash, rehash on load */
+    /* if (SDL_RWops.write(dst, &(templ->hash), sizeof(templ->hash), 1) != 1) return 0; */
+
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+    if (SDL_RWwrite(dst, templ->path,
+                    sizeof(templ->path[0]),DOLLARNPOINTS) != DOLLARNPOINTS) {
+        return 0;
+    }
+#else
+    {
+        SDL_DollarTemplate copy = *templ;
+        SDL_FloatPoint *p = copy.path;
+        int i;
+        for (i = 0; i < DOLLARNPOINTS; i++, p++) {
+            p->x = SDL_SwapFloatLE(p->x);
+            p->y = SDL_SwapFloatLE(p->y);
+        }
+
+        if (SDL_RWwrite(dst, copy.path,
+                        sizeof(copy.path[0]),DOLLARNPOINTS) != DOLLARNPOINTS) {
+            return 0;
+        }
+    }
+#endif
+
+    return 1;
+}
+
+
+int SDL_SaveAllDollarTemplates(SDL_RWops *dst)
+{
+    int i,j,rtrn = 0;
+    for (i = 0; i < SDL_numGestureTouches; i++) {
+        SDL_GestureTouch* touch = &SDL_gestureTouch[i];
+        for (j = 0; j < touch->numDollarTemplates; j++) {
+            rtrn += SaveTemplate(&touch->dollarTemplate[j], dst);
+        }
+    }
+    return rtrn;
+}
+
+int SDL_SaveDollarTemplate(SDL_GestureID gestureId, SDL_RWops *dst)
+{
+    int i,j;
+    for (i = 0; i < SDL_numGestureTouches; i++) {
+        SDL_GestureTouch* touch = &SDL_gestureTouch[i];
+        for (j = 0; j < touch->numDollarTemplates; j++) {
+            if (touch->dollarTemplate[j].hash == gestureId) {
+                return SaveTemplate(&touch->dollarTemplate[j], dst);
+            }
+        }
+    }
+    return SDL_SetError("Unknown gestureId");
+}
+
+/* path is an already sampled set of points
+Returns the index of the gesture on success, or -1 */
+static int SDL_AddDollarGesture_one(SDL_GestureTouch* inTouch, SDL_FloatPoint* path)
+{
+    SDL_DollarTemplate* dollarTemplate;
+    SDL_DollarTemplate *templ;
+    int index;
+
+    index = inTouch->numDollarTemplates;
+    dollarTemplate =
+        (SDL_DollarTemplate *)SDL_realloc(inTouch->dollarTemplate,
+                                          (index + 1) *
+                                          sizeof(SDL_DollarTemplate));
+    if (!dollarTemplate) {
+        return SDL_OutOfMemory();
+    }
+    inTouch->dollarTemplate = dollarTemplate;
+
+    templ = &inTouch->dollarTemplate[index];
+    SDL_memcpy(templ->path, path, DOLLARNPOINTS*sizeof(SDL_FloatPoint));
+    templ->hash = SDL_HashDollar(templ->path);
+    inTouch->numDollarTemplates++;
+
+    return index;
+}
+
+static int SDL_AddDollarGesture(SDL_GestureTouch* inTouch, SDL_FloatPoint* path)
+{
+    int index = -1;
+    int i = 0;
+    if (inTouch == NULL) {
+        if (SDL_numGestureTouches == 0) return SDL_SetError("no gesture touch devices registered");
+        for (i = 0; i < SDL_numGestureTouches; i++) {
+            inTouch = &SDL_gestureTouch[i];
+            index = SDL_AddDollarGesture_one(inTouch, path);
+            if (index < 0)
+                return -1;
+        }
+        /* Use the index of the last one added. */
+        return index;
+    }
+    return SDL_AddDollarGesture_one(inTouch, path);
+}
+
+int SDL_LoadDollarTemplates(SDL_TouchID touchId, SDL_RWops *src)
+{
+    int i,loaded = 0;
+    SDL_GestureTouch *touch = NULL;
+    if (src == NULL) return 0;
+    if (touchId >= 0) {
+        for (i = 0; i < SDL_numGestureTouches; i++) {
+            if (SDL_gestureTouch[i].id == touchId) {
+                touch = &SDL_gestureTouch[i];
+            }
+        }
+        if (touch == NULL) {
+            return SDL_SetError("given touch id not found");
+        }
+    }
+
+    while (1) {
+        SDL_DollarTemplate templ;
+
+        if (SDL_RWread(src,templ.path,sizeof(templ.path[0]),DOLLARNPOINTS) < DOLLARNPOINTS) {
+            if (loaded == 0) {
+                return SDL_SetError("could not read any dollar gesture from rwops");
+            }
+            break;
+        }
+
+#if SDL_BYTEORDER != SDL_LIL_ENDIAN
+        for (i = 0; i < DOLLARNPOINTS; i++) {
+            SDL_FloatPoint *p = &templ.path[i];
+            p->x = SDL_SwapFloatLE(p->x);
+            p->y = SDL_SwapFloatLE(p->y);
+        }
+#endif
+
+        if (touchId >= 0) {
+            /* printf("Adding loaded gesture to 1 touch\n"); */
+            if (SDL_AddDollarGesture(touch, templ.path) >= 0)
+                loaded++;
+        }
+        else {
+            /* printf("Adding to: %i touches\n",SDL_numGestureTouches); */
+            for (i = 0; i < SDL_numGestureTouches; i++) {
+                touch = &SDL_gestureTouch[i];
+                /* printf("Adding loaded gesture to + touches\n"); */
+                /* TODO: What if this fails? */
+                SDL_AddDollarGesture(touch,templ.path);
+            }
+            loaded++;
+        }
+    }
+
+    return loaded;
+}
+
+
+static float dollarDifference(SDL_FloatPoint* points,SDL_FloatPoint* templ,float ang)
+{
+    /*  SDL_FloatPoint p[DOLLARNPOINTS]; */
+    float dist = 0;
+    SDL_FloatPoint p;
+    int i;
+    for (i = 0; i < DOLLARNPOINTS; i++) {
+        p.x = (float)(points[i].x * SDL_cos(ang) - points[i].y * SDL_sin(ang));
+        p.y = (float)(points[i].x * SDL_sin(ang) + points[i].y * SDL_cos(ang));
+        dist += (float)(SDL_sqrt((p.x-templ[i].x)*(p.x-templ[i].x)+
+                                 (p.y-templ[i].y)*(p.y-templ[i].y)));
+    }
+    return dist/DOLLARNPOINTS;
+
+}
+
+static float bestDollarDifference(SDL_FloatPoint* points,SDL_FloatPoint* templ)
+{
+    /*------------BEGIN DOLLAR BLACKBOX------------------
+      -TRANSLATED DIRECTLY FROM PSUDEO-CODE AVAILABLE AT-
+      -"http://depts.washington.edu/aimgroup/proj/dollar/"
+    */
+    double ta = -M_PI/4;
+    double tb = M_PI/4;
+    double dt = M_PI/90;
+    float x1 = (float)(PHI*ta + (1-PHI)*tb);
+    float f1 = dollarDifference(points,templ,x1);
+    float x2 = (float)((1-PHI)*ta + PHI*tb);
+    float f2 = dollarDifference(points,templ,x2);
+    while (SDL_fabs(ta-tb) > dt) {
+        if (f1 < f2) {
+            tb = x2;
+            x2 = x1;
+            f2 = f1;
+            x1 = (float)(PHI*ta + (1-PHI)*tb);
+            f1 = dollarDifference(points,templ,x1);
+        }
+        else {
+            ta = x1;
+            x1 = x2;
+            f1 = f2;
+            x2 = (float)((1-PHI)*ta + PHI*tb);
+            f2 = dollarDifference(points,templ,x2);
+        }
+    }
+    /*
+      if (f1 <= f2)
+          printf("Min angle (x1): %f\n",x1);
+      else if (f1 >  f2)
+          printf("Min angle (x2): %f\n",x2);
+    */
+    return SDL_min(f1,f2);
+}
+
+/* DollarPath contains raw points, plus (possibly) the calculated length */
+static int dollarNormalize(const SDL_DollarPath *path,SDL_FloatPoint *points)
+{
+    int i;
+    float interval;
+    float dist;
+    int numPoints = 0;
+    SDL_FloatPoint centroid;
+    float xmin,xmax,ymin,ymax;
+    float ang;
+    float w,h;
+    float length = path->length;
+
+    /* Calculate length if it hasn't already been done */
+    if (length <= 0) {
+        for (i=1;i < path->numPoints; i++) {
+            float dx = path->p[i  ].x - path->p[i-1].x;
+            float dy = path->p[i  ].y - path->p[i-1].y;
+            length += (float)(SDL_sqrt(dx*dx+dy*dy));
+        }
+    }
+
+    /* Resample */
+    interval = length/(DOLLARNPOINTS - 1);
+    dist = interval;
+
+    centroid.x = 0;centroid.y = 0;
+
+    /* printf("(%f,%f)\n",path->p[path->numPoints-1].x,path->p[path->numPoints-1].y); */
+    for (i = 1; i < path->numPoints; i++) {
+        float d = (float)(SDL_sqrt((path->p[i-1].x-path->p[i].x)*(path->p[i-1].x-path->p[i].x)+
+                                   (path->p[i-1].y-path->p[i].y)*(path->p[i-1].y-path->p[i].y)));
+        /* printf("d = %f dist = %f/%f\n",d,dist,interval); */
+        while (dist + d > interval) {
+            points[numPoints].x = path->p[i-1].x +
+                ((interval-dist)/d)*(path->p[i].x-path->p[i-1].x);
+            points[numPoints].y = path->p[i-1].y +
+                ((interval-dist)/d)*(path->p[i].y-path->p[i-1].y);
+            centroid.x += points[numPoints].x;
+            centroid.y += points[numPoints].y;
+            numPoints++;
+
+            dist -= interval;
+        }
+        dist += d;
+    }
+    if (numPoints < DOLLARNPOINTS-1) {
+        SDL_SetError("ERROR: NumPoints = %i", numPoints);
+        return 0;
+    }
+    /* copy the last point */
+    points[DOLLARNPOINTS-1] = path->p[path->numPoints-1];
+    numPoints = DOLLARNPOINTS;
+
+    centroid.x /= numPoints;
+    centroid.y /= numPoints;
+
+    /* printf("Centroid (%f,%f)",centroid.x,centroid.y); */
+    /* Rotate Points so point 0 is left of centroid and solve for the bounding box */
+    xmin = centroid.x;
+    xmax = centroid.x;
+    ymin = centroid.y;
+    ymax = centroid.y;
+
+    ang = (float)(SDL_atan2(centroid.y - points[0].y,
+                            centroid.x - points[0].x));
+
+    for (i = 0; i<numPoints; i++) {
+        float px = points[i].x;
+        float py = points[i].y;
+        points[i].x = (float)((px - centroid.x)*SDL_cos(ang) -
+                              (py - centroid.y)*SDL_sin(ang) + centroid.x);
+        points[i].y = (float)((px - centroid.x)*SDL_sin(ang) +
+                              (py - centroid.y)*SDL_cos(ang) + centroid.y);
+
+
+        if (points[i].x < xmin) xmin = points[i].x;
+        if (points[i].x > xmax) xmax = points[i].x;
+        if (points[i].y < ymin) ymin = points[i].y;
+        if (points[i].y > ymax) ymax = points[i].y;
+    }
+
+    /* Scale points to DOLLARSIZE, and translate to the origin */
+    w = xmax-xmin;
+    h = ymax-ymin;
+
+    for (i=0; i<numPoints; i++) {
+        points[i].x = (points[i].x - centroid.x)*DOLLARSIZE/w;
+        points[i].y = (points[i].y - centroid.y)*DOLLARSIZE/h;
+    }
+    return numPoints;
+}
+
+static float dollarRecognize(const SDL_DollarPath *path,int *bestTempl,SDL_GestureTouch* touch)
+{
+    SDL_FloatPoint points[DOLLARNPOINTS];
+    int i;
+    float bestDiff = 10000;
+
+    SDL_memset(points, 0, sizeof(points));
+
+    dollarNormalize(path,points);
+
+    /* PrintPath(points); */
+    *bestTempl = -1;
+    for (i = 0; i < touch->numDollarTemplates; i++) {
+        float diff = bestDollarDifference(points,touch->dollarTemplate[i].path);
+        if (diff < bestDiff) {bestDiff = diff; *bestTempl = i;}
+    }
+    return bestDiff;
+}
+
+int SDL_GestureAddTouch(SDL_TouchID touchId)
+{
+    SDL_GestureTouch *gestureTouch = (SDL_GestureTouch *)SDL_realloc(SDL_gestureTouch,
+                                                                     (SDL_numGestureTouches + 1) *
+                                                                     sizeof(SDL_GestureTouch));
+
+    if (!gestureTouch) {
+        return SDL_OutOfMemory();
+    }
+
+    SDL_gestureTouch = gestureTouch;
+
+    SDL_zero(SDL_gestureTouch[SDL_numGestureTouches]);
+    SDL_gestureTouch[SDL_numGestureTouches].id = touchId;
+    SDL_numGestureTouches++;
+    return 0;
+}
+
+int SDL_GestureDelTouch(SDL_TouchID touchId)
+{
+    int i;
+    for (i = 0; i < SDL_numGestureTouches; i++) {
+        if (SDL_gestureTouch[i].id == touchId) {
+            break;
+        }
+    }
+
+    if (i == SDL_numGestureTouches) {
+        /* not found */
+        return -1;
+    }
+
+    SDL_free(SDL_gestureTouch[i].dollarTemplate);
+    SDL_zero(SDL_gestureTouch[i]);
+
+    SDL_numGestureTouches--;
+    SDL_memcpy(&SDL_gestureTouch[i], &SDL_gestureTouch[SDL_numGestureTouches], sizeof(SDL_gestureTouch[i]));
+    return 0;
+}
+
+static SDL_GestureTouch * SDL_GetGestureTouch(SDL_TouchID id)
+{
+    int i;
+    for (i = 0; i < SDL_numGestureTouches; i++) {
+        /* printf("%i ?= %i\n",SDL_gestureTouch[i].id,id); */
+        if (SDL_gestureTouch[i].id == id)
+            return &SDL_gestureTouch[i];
+    }
+    return NULL;
+}
+
+static int SDL_SendGestureMulti(SDL_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;
+    event.mgesture.numFingers = touch->numDownFingers;
+    return SDL_PushEvent(&event) > 0;
+}
+
+static int SDL_SendGestureDollar(SDL_GestureTouch* touch,
+                          SDL_GestureID gestureId,float error)
+{
+    SDL_Event event;
+    event.dgesture.type = SDL_DOLLARGESTURE;
+    event.dgesture.touchId = touch->id;
+    event.dgesture.x = touch->centroid.x;
+    event.dgesture.y = touch->centroid.y;
+    event.dgesture.gestureId = gestureId;
+    event.dgesture.error = error;
+    /* A finger came up to trigger this event. */
+    event.dgesture.numFingers = touch->numDownFingers + 1;
+    return SDL_PushEvent(&event) > 0;
+}
+
+
+static int SDL_SendDollarRecord(SDL_GestureTouch* touch,SDL_GestureID gestureId)
+{
+    SDL_Event event;
+    event.dgesture.type = SDL_DOLLARRECORD;
+    event.dgesture.touchId = touch->id;
+    event.dgesture.gestureId = gestureId;
+    return SDL_PushEvent(&event) > 0;
+}
+
+
+void SDL_GestureProcessEvent(SDL_Event* event)
+{
+    float x,y;
+    int index;
+    int i;
+    float pathDx, pathDy;
+    SDL_FloatPoint lastP;
+    SDL_FloatPoint lastCentroid;
+    float lDist;
+    float Dist;
+    float dtheta;
+    float dDist;
+
+    if (event->type == SDL_FINGERMOTION ||
+        event->type == SDL_FINGERDOWN ||
+        event->type == SDL_FINGERUP) {
+        SDL_GestureTouch* inTouch = SDL_GetGestureTouch(event->tfinger.touchId);
+
+        /* Shouldn't be possible */
+        if (inTouch == NULL) return;
+
+        x = event->tfinger.x;
+        y = event->tfinger.y;
+
+        /* Finger Up */
+        if (event->type == SDL_FINGERUP) {
+            SDL_FloatPoint path[DOLLARNPOINTS];
+
+            inTouch->numDownFingers--;
+
+#ifdef ENABLE_DOLLAR
+            if (inTouch->recording) {
+                inTouch->recording = SDL_FALSE;
+                dollarNormalize(&inTouch->dollarPath,path);
+                /* PrintPath(path); */
+                if (recordAll) {
+                    index = SDL_AddDollarGesture(NULL,path);
+                    for (i = 0; i < SDL_numGestureTouches; i++)
+                        SDL_gestureTouch[i].recording = SDL_FALSE;
+                }
+                else {
+                    index = SDL_AddDollarGesture(inTouch,path);
+                }
+
+                if (index >= 0) {
+                    SDL_SendDollarRecord(inTouch,inTouch->dollarTemplate[index].hash);
+                }
+                else {
+                    SDL_SendDollarRecord(inTouch,-1);
+                }
+            }
+            else {
+                int bestTempl;
+                float error;
+                error = dollarRecognize(&inTouch->dollarPath,
+                                        &bestTempl,inTouch);
+                if (bestTempl >= 0){
+                    /* Send Event */
+                    unsigned long gestureId = inTouch->dollarTemplate[bestTempl].hash;
+                    SDL_SendGestureDollar(inTouch,gestureId,error);
+                    /* printf ("%s\n",);("Dollar error: %f\n",error); */
+                }
+            }
+#endif
+            /* inTouch->gestureLast[j] = inTouch->gestureLast[inTouch->numDownFingers]; */
+            if (inTouch->numDownFingers > 0) {
+                inTouch->centroid.x = (inTouch->centroid.x*(inTouch->numDownFingers+1)-
+                                       x)/inTouch->numDownFingers;
+                inTouch->centroid.y = (inTouch->centroid.y*(inTouch->numDownFingers+1)-
+                                       y)/inTouch->numDownFingers;
+            }
+        }
+        else if (event->type == SDL_FINGERMOTION) {
+            float dx = event->tfinger.dx;
+            float dy = event->tfinger.dy;
+#ifdef ENABLE_DOLLAR
+            SDL_DollarPath* path = &inTouch->dollarPath;
+            if (path->numPoints < MAXPATHSIZE) {
+                path->p[path->numPoints].x = inTouch->centroid.x;
+                path->p[path->numPoints].y = inTouch->centroid.y;
+                pathDx =
+                    (path->p[path->numPoints].x-path->p[path->numPoints-1].x);
+                pathDy =
+                    (path->p[path->numPoints].y-path->p[path->numPoints-1].y);
+                path->length += (float)SDL_sqrt(pathDx*pathDx + pathDy*pathDy);
+                path->numPoints++;
+            }
+#endif
+            lastP.x = x - dx;
+            lastP.y = y - dy;
+            lastCentroid = inTouch->centroid;
+
+            inTouch->centroid.x += dx/inTouch->numDownFingers;
+            inTouch->centroid.y += dy/inTouch->numDownFingers;
+            /* printf("Centrid : (%f,%f)\n",inTouch->centroid.x,inTouch->centroid.y); */
+            if (inTouch->numDownFingers > 1) {
+                SDL_FloatPoint lv; /* Vector from centroid to last x,y position */
+                SDL_FloatPoint v; /* Vector from centroid to current x,y position */
+                /* lv = inTouch->gestureLast[j].cv; */
+                lv.x = lastP.x - lastCentroid.x;
+                lv.y = lastP.y - lastCentroid.y;
+                lDist = (float)SDL_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; */
+                Dist = (float)SDL_sqrt(v.x*v.x+v.y*v.y);
+                /* SDL_cos(dTheta) = (v . lv)/(|v| * |lv|) */
+
+                /* Normalize Vectors to simplify angle calculation */
+                lv.x/=lDist;
+                lv.y/=lDist;
+                v.x/=Dist;
+                v.y/=Dist;
+                dtheta = (float)SDL_atan2(lv.x*v.y - lv.y*v.x,lv.x*v.x + lv.y*v.y);
+
+                dDist = (Dist - lDist);
+                if (lDist == 0) {dDist = 0;dtheta = 0;} /* To avoid impossible values */
+
+                /* inTouch->gestureLast[j].dDist = dDist;
+                inTouch->gestureLast[j].dtheta = dtheta;
+
+                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? */
+        }
+        else if (event->type == SDL_FINGERDOWN) {
+
+            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;
+            /* printf("Finger Down: (%f,%f). Centroid: (%f,%f\n",x,y,
+                 inTouch->centroid.x,inTouch->centroid.y); */
+
+#ifdef ENABLE_DOLLAR
+            inTouch->dollarPath.length = 0;
+            inTouch->dollarPath.p[0].x = x;
+            inTouch->dollarPath.p[0].y = y;
+            inTouch->dollarPath.numPoints = 1;
+#endif
+        }
+    }
+}
+
+/* vi: set ts=4 sw=4 expandtab: */