test/testgesture.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Sat, 02 Nov 2013 12:07:21 +0100
changeset 7900 cc2289c332eb
parent 7678 286c42d7c5ed
child 8149 681eb46b8ac4
permissions -rw-r--r--
Changed parameter name for gesture template save functions from "src" to "dst".
     1 /*
     2   Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
     3 
     4   This software is provided 'as-is', without any express or implied
     5   warranty.  In no event will the authors be held liable for any damages
     6   arising from the use of this software.
     7 
     8   Permission is granted to anyone to use this software for any purpose,
     9   including commercial applications, and to alter it and redistribute it
    10   freely.
    11 */
    12 /*  Usage:
    13  *  Spacebar to begin recording a gesture on all touches.
    14  *  s to save all touches into "./gestureSave"
    15  *  l to load all touches from "./gestureSave"
    16  */
    17 
    18 #include <stdio.h>
    19 #include <math.h>
    20 
    21 #include "SDL.h"
    22 #include "SDL_touch.h"
    23 #include "SDL_gesture.h"
    24 
    25 /* Make sure we have good macros for printing 32 and 64 bit values */
    26 #ifndef PRIs32
    27 #define PRIs32 "d"
    28 #endif
    29 #ifndef PRIu32
    30 #define PRIu32 "u"
    31 #endif
    32 #ifndef PRIs64
    33 #ifdef __WIN32__
    34 #define PRIs64 "I64"
    35 #else
    36 #define PRIs64 "lld"
    37 #endif
    38 #endif
    39 #ifndef PRIu64
    40 #ifdef __WIN32__
    41 #define PRIu64 "I64u"
    42 #else
    43 #define PRIu64 "llu"
    44 #endif
    45 #endif
    46 
    47 #define WIDTH 640
    48 #define HEIGHT 480
    49 #define BPP 4
    50 #define DEPTH 32
    51 
    52 /* MUST BE A POWER OF 2! */
    53 #define EVENT_BUF_SIZE 256
    54 
    55 
    56 #define VERBOSE 0
    57 
    58 static SDL_Window *window;
    59 static SDL_Event events[EVENT_BUF_SIZE];
    60 static int eventWrite;
    61 
    62 
    63 static int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
    64 
    65 typedef struct {
    66   float x,y;
    67 } Point;
    68 
    69 typedef struct {
    70   float ang,r;
    71   Point p;
    72 } Knob;
    73 
    74 static Knob knob;
    75 
    76 void handler (int sig)
    77 {
    78   SDL_Log ("exiting...(%d)", sig);
    79   exit (0);
    80 }
    81 
    82 void perror_exit (char *error)
    83 {
    84   perror (error);
    85   handler (9);
    86 }
    87 
    88 void setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
    89 {
    90   Uint32 *pixmem32;
    91   Uint32 colour;
    92   Uint8 r,g,b;
    93   int x = (int)_x;
    94   int y = (int)_y;
    95   float a;
    96 
    97   if(x < 0 || x >= screen->w) return;
    98   if(y < 0 || y >= screen->h) return;
    99 
   100   pixmem32 = (Uint32*) screen->pixels  + y*screen->pitch/BPP + x;
   101 
   102   SDL_memcpy(&colour,pixmem32,screen->format->BytesPerPixel);
   103 
   104   SDL_GetRGB(colour,screen->format,&r,&g,&b);
   105   /* r = 0;g = 0; b = 0; */
   106   a = (float)((col>>24)&0xFF);
   107   if(a == 0) a = 0xFF; /* Hack, to make things easier. */
   108   a /= 0xFF;
   109   r = (Uint8)(r*(1-a) + ((col>>16)&0xFF)*(a));
   110   g = (Uint8)(g*(1-a) + ((col>> 8)&0xFF)*(a));
   111   b = (Uint8)(b*(1-a) + ((col>> 0)&0xFF)*(a));
   112   colour = SDL_MapRGB( screen->format,r, g, b);
   113 
   114 
   115   *pixmem32 = colour;
   116 }
   117 
   118 void drawLine(SDL_Surface *screen,float x0,float y0,float x1,float y1,unsigned int col) {
   119   float t;
   120   for(t=0;t<1;t+=(float)(1.f/SDL_max(SDL_fabs(x0-x1),SDL_fabs(y0-y1))))
   121     setpix(screen,x1+t*(x0-x1),y1+t*(y0-y1),col);
   122 }
   123 
   124 void drawCircle(SDL_Surface* screen,float x,float y,float r,unsigned int c)
   125 {
   126   float tx,ty;
   127   float xr;
   128   for(ty = (float)-SDL_fabs(r);ty <= (float)SDL_fabs((int)r);ty++) {
   129     xr = (float)sqrt(r*r - ty*ty);
   130     if(r > 0) { /* r > 0 ==> filled circle */
   131       for(tx=-xr+.5f;tx<=xr-.5;tx++) {
   132     setpix(screen,x+tx,y+ty,c);
   133       }
   134     }
   135     else {
   136       setpix(screen,x-xr+.5f,y+ty,c);
   137       setpix(screen,x+xr-.5f,y+ty,c);
   138     }
   139   }
   140 }
   141 
   142 void drawKnob(SDL_Surface* screen,Knob k) {
   143   drawCircle(screen,k.p.x*screen->w,k.p.y*screen->h,k.r*screen->w,0xFFFFFF);
   144   drawCircle(screen,(k.p.x+k.r/2*SDL_cosf(k.ang))*screen->w,
   145                 (k.p.y+k.r/2*SDL_sinf(k.ang))*screen->h,k.r/4*screen->w,0);
   146 }
   147 
   148 void DrawScreen(SDL_Surface* screen)
   149 {
   150   int i;
   151 #if 1
   152   SDL_FillRect(screen, NULL, 0);
   153 #else
   154   int x, y;
   155   for(y = 0;y < screen->h;y++)
   156     for(x = 0;x < screen->w;x++)
   157     setpix(screen,(float)x,(float)y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
   158 #endif
   159 
   160   /* draw Touch History */
   161   for(i = eventWrite; i < eventWrite+EVENT_BUF_SIZE; ++i) {
   162     const SDL_Event *event = &events[i&(EVENT_BUF_SIZE-1)];
   163     float age = (float)(i - eventWrite) / EVENT_BUF_SIZE;
   164     float x, y;
   165     unsigned int c, col;
   166 
   167     if(event->type == SDL_FINGERMOTION ||
   168        event->type == SDL_FINGERDOWN ||
   169        event->type == SDL_FINGERUP) {
   170       x = event->tfinger.x;
   171       y = event->tfinger.y;
   172 
   173       /* draw the touch: */
   174       c = colors[event->tfinger.fingerId%7];
   175       col = ((unsigned int)(c*(.1+.85))) | (unsigned int)(0xFF*age)<<24;
   176 
   177       if(event->type == SDL_FINGERMOTION)
   178     drawCircle(screen,x*screen->w,y*screen->h,5,col);
   179       else if(event->type == SDL_FINGERDOWN)
   180     drawCircle(screen,x*screen->w,y*screen->h,-10,col);
   181     }
   182   }
   183 
   184   if(knob.p.x > 0)
   185     drawKnob(screen,knob);
   186 
   187   SDL_UpdateWindowSurface(window);
   188 }
   189 
   190 SDL_Surface* initScreen(int width,int height)
   191 {
   192   if (!window) {
   193     window = SDL_CreateWindow("Gesture Test",
   194                               SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
   195                               width, height, SDL_WINDOW_RESIZABLE);
   196   }
   197   if (!window) {
   198     return NULL;
   199   }
   200   return SDL_GetWindowSurface(window);
   201 }
   202 
   203 int main(int argc, char* argv[])
   204 {
   205   SDL_Surface *screen;
   206   SDL_Event event;
   207   SDL_bool quitting = SDL_FALSE;
   208   SDL_RWops *stream;
   209 
   210   /* Enable standard application logging */
   211   SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
   212 
   213   /* gesture variables */
   214   knob.r = .1f;
   215   knob.ang = 0;
   216 
   217   if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
   218 
   219   if (!(screen = initScreen(WIDTH,HEIGHT)))
   220     {
   221       SDL_Quit();
   222       return 1;
   223     }
   224 
   225   while(!quitting) {
   226     while(SDL_PollEvent(&event))
   227       {
   228     /* Record _all_ events */
   229     events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
   230     eventWrite++;
   231 
   232     switch (event.type)
   233       {
   234       case SDL_QUIT:
   235         quitting = SDL_TRUE;
   236         break;
   237       case SDL_KEYDOWN:
   238         switch (event.key.keysym.sym)
   239           {
   240           case SDLK_SPACE:
   241         SDL_RecordGesture(-1);
   242         break;
   243           case SDLK_s:
   244         stream = SDL_RWFromFile("gestureSave", "w");
   245         SDL_Log("Wrote %i templates", SDL_SaveAllDollarTemplates(stream));
   246         SDL_RWclose(stream);
   247         break;
   248           case SDLK_l:
   249         stream = SDL_RWFromFile("gestureSave", "r");
   250         SDL_Log("Loaded: %i", SDL_LoadDollarTemplates(-1, stream));
   251         SDL_RWclose(stream);
   252         break;
   253           case SDLK_ESCAPE:
   254         quitting = SDL_TRUE;
   255         break;
   256         }
   257         break;
   258       case SDL_WINDOWEVENT:
   259             if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
   260           if (!(screen = initScreen(event.window.data1, event.window.data2)))
   261           {
   262         SDL_Quit();
   263         return 1;
   264           }
   265             }
   266         break;
   267       case SDL_FINGERMOTION:
   268 #if VERBOSE
   269         SDL_Log("Finger: %i,x: %i, y: %i",event.tfinger.fingerId,
   270                event.tfinger.x,event.tfinger.y);
   271 #endif
   272         break;
   273       case SDL_FINGERDOWN:
   274 #if VERBOSE
   275         SDL_Log("Finger: %"PRIs64" down - x: %i, y: %i",
   276            event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
   277 #endif
   278         break;
   279       case SDL_FINGERUP:
   280 #if VERBOSE
   281         SDL_Log("Finger: %"PRIs64" up - x: %i, y: %i",
   282                event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
   283 #endif
   284         break;
   285       case SDL_MULTIGESTURE:
   286 #if VERBOSE
   287         SDL_Log("Multi Gesture: x = %f, y = %f, dAng = %f, dR = %f",
   288            event.mgesture.x,
   289            event.mgesture.y,
   290            event.mgesture.dTheta,
   291            event.mgesture.dDist);
   292         SDL_Log("MG: numDownTouch = %i",event.mgesture.numFingers);
   293 #endif
   294         knob.p.x = event.mgesture.x;
   295         knob.p.y = event.mgesture.y;
   296         knob.ang += event.mgesture.dTheta;
   297         knob.r += event.mgesture.dDist;
   298         break;
   299       case SDL_DOLLARGESTURE:
   300         SDL_Log("Gesture %"PRIs64" performed, error: %f",
   301            event.dgesture.gestureId,
   302            event.dgesture.error);
   303         break;
   304       case SDL_DOLLARRECORD:
   305         SDL_Log("Recorded gesture: %"PRIs64"",event.dgesture.gestureId);
   306         break;
   307       }
   308       }
   309     DrawScreen(screen);
   310   }
   311   SDL_Quit();
   312   return 0;
   313 }
   314