Mercurial > sdl-ios-xcode

annotate touchTest/gestureSDLTest.c @ 4662:3c4e0130c9b1

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Added alternative finger tracking method. Still prefer IPHONE_TOUCH_EFFICIENT_DANGEROUS.
author Jim Grandpre <jim.tla@gmail.com>
date Tue, 13 Jul 2010 18:31:09 -0400
parents 063b9455bd1a
children 317a151b79ad
rev   line source
4657
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1 #include <stdio.h>
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2 #include <SDL.h>
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3 #include <math.h>
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4 #include <SDL_touch.h>
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5 #include <SDL_gesture.h>
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6
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7 #define PI 3.1415926535897
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8 #define PHI ((sqrt(5)-1)/2)
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9 #define WIDTH 640
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10 #define HEIGHT 480
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11 #define BPP 4
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12 #define DEPTH 32
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13
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14 #define MAXFINGERS 5
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15
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16 #define DOLLARNPOINTS 64
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17 #define DOLLARSIZE 256
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18
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19 //MUST BE A POWER OF 2!
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20 #define EVENT_BUF_SIZE 256
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21
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22 SDL_Event events[EVENT_BUF_SIZE];
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23 int eventWrite;
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24
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25 int mousx,mousy;
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26 int keystat[512];
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27 int bstatus;
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28
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29 int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
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30
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31 int index2fingerid[MAXFINGERS];
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32 int fingersDown;
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33
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34 typedef struct {
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35 float x,y;
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36 } Point;
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37
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38 typedef struct {
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39 Point p;
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40 float pressure;
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41 int id;
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42 } Finger;
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43
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44 typedef struct {
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45 Finger f;
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46 Point cv;
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47 float dtheta,dDist;
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48 } TouchPoint;
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49
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50
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51 typedef struct { //dt + s
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52 Point d,s; //direction, start
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53 int points;
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54 } Line;
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55
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56
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57 typedef struct {
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58 float length;
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59
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60 int numPoints;
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61 Point p[EVENT_BUF_SIZE]; //To be safe
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62 } DollarPath;
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63
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64 typedef struct {
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65 float ang,r;
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66 Point p;
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67 } Knob;
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68
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69 Knob knob;
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70
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71 Finger finger[MAXFINGERS];
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72
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73
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74 DollarPath dollarPath[MAXFINGERS];
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75
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76 #define MAXTEMPLATES 4
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77
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78 Point dollarTemplate[MAXTEMPLATES][DOLLARNPOINTS];
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79 int numDollarTemplates = 0;
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80 #ifdef DRAW_VECTOR_EST
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81 Line gestureLine[MAXFINGERS];
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82 #endif
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83
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84 void handler (int sig)
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85 {
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86 printf ("\exiting...(%d)\n", sig);
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87 exit (0);
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88 }
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89
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90 void perror_exit (char *error)
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91 {
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92 perror (error);
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93 handler (9);
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94 }
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95
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96
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97 void setpix(SDL_Surface *screen, int x, int y, unsigned int col)
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98 {
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99 Uint32 *pixmem32;
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100 Uint32 colour;
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101
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102 if((unsigned)x > screen->w) return;
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103 if((unsigned)y > screen->h) return;
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104
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105 pixmem32 = (Uint32*) screen->pixels + y*screen->pitch/BPP + x;
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106
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107 Uint8 r,g,b;
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108 float a;
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109
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110 memcpy(&colour,pixmem32,screen->format->BytesPerPixel);
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111
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112 SDL_GetRGB(colour,screen->format,&r,&g,&b); //Always returns 0xFFFFFF?
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113 //r = 0;g = 0; b = 0;
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114 a = (col>>24)&0xFF;
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115 if(a == 0) a = 0xFF; //Hack, to make things easier.
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116 a /= 0xFF;
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117 r = r*(1-a) + ((col>>16)&0xFF)*(a);
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118 g = g*(1-a) + ((col>> 8)&0xFF)*(a);
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119 b = b*(1-a) + ((col>> 0)&0xFF)*(a);
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120 colour = SDL_MapRGB( screen->format,r, g, b);
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121
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122
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123 *pixmem32 = colour;
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124 }
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125
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126 void drawLine(SDL_Surface *screen,int x0,int y0,int x1,int y1,unsigned int col) {
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127 float t;
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128 for(t=0;t<1;t+=1.f/SDL_max(abs(x0-x1),abs(y0-y1)))
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129 setpix(screen,x1+t*(x0-x1),y1+t*(y0-y1),col);
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130 }
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131 void drawCircle(SDL_Surface* screen,int x,int y,int r,unsigned int c)
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132 {
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133
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134 float a;
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135 int tx;
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136
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137 int ty;
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138 float xr;
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139 for(ty = -abs(r);ty <= abs(r);ty++) {
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140 xr = sqrt(r*r - ty*ty);
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141 if(r > 0) { //r > 0 ==> filled circle
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142 for(tx=-xr+.5;tx<=xr-.5;tx++) {
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143 setpix(screen,x+tx,y+ty,c);
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144 }
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145 }
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146 else {
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147 setpix(screen,x-xr+.5,y+ty,c);
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148 setpix(screen,x+xr-.5,y+ty,c);
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149 }
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150 }
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151 }
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152
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153 void drawKnob(SDL_Surface* screen,Knob k) {
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154 //printf("Knob: x = %f, y = %f, r = %f, a = %f\n",k.p.x,k.p.y,k.r,k.ang);
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155
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156 drawCircle(screen,k.p.x*screen->w,k.p.y*screen->h,k.r*screen->w,0xFFFFFF);
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157
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158 drawCircle(screen,(k.p.x+k.r/2*cos(k.ang))*screen->w,
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159 (k.p.y+k.r/2*sin(k.ang))*screen->h,k.r/4*screen->w,0);
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160
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161 }
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162
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163 void DrawScreen(SDL_Surface* screen, int h)
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164 {
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165 int x, y, xm,ym,c;
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166 if(SDL_MUSTLOCK(screen))
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167 {
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168 if(SDL_LockSurface(screen) < 0) return;
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169 }
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170 for(y = 0; y < screen->h; y++ )
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171 {
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172 for( x = 0; x < screen->w; x++ )
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173 {
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174 //setpixel(screen, x, y, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
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175 //xm = (x+h)%screen->w;
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176 //ym = (y+h)%screen->w;
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177 //c = sin(h/256*2*PI)*x*y/screen->w/screen->h;
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178 //setpix(screen,x,y,255*sin(xm/screen->w*2*PI),sin(h/255*2*PI)*255*y/screen->h,c);
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179 setpix(screen,x,y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
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180 //setpix(screen,x,y,0); //Inefficient, but that's okay...
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181 }
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182 }
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183 drawCircle(screen,mousx,mousy,-30,0xFFFFFF);
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184 drawLine(screen,0,0,screen->w,screen->h,0xFFFFFF);
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185
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186 int i;
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187 //draw Touch History
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188 TouchPoint gestureLast[MAXFINGERS];
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189 //printf("------------------Start History------------------\n");
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190 for(i = 0;i < MAXFINGERS;i++) {
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191 gestureLast[i].f.id = -1;
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192 }
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193 int numDownFingers = 0;
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194 Point centroid;
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195 float gdtheta,gdDist;
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196
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197
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198 for(i = SDL_max(0,eventWrite - EVENT_BUF_SIZE);i < eventWrite;i++) {
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199 SDL_Event event = events[i&(EVENT_BUF_SIZE-1)];
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200 int age = eventWrite - i - 1;
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201 if(event.type == SDL_FINGERMOTION ||
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202 event.type == SDL_FINGERDOWN ||
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203 event.type == SDL_FINGERUP) {
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204 SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId);
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205 //SDL_Finger* inFinger = SDL_GetFinger(inTouch,event.tfinger.fingerId);
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206
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207 float x = ((float)event.tfinger.x)/inTouch->xres;
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208 float y = ((float)event.tfinger.y)/inTouch->yres;
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209
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210 //draw the touch:
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211
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212 unsigned int c = colors[event.tfinger.touchId%7];
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213 unsigned int col =
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214 ((unsigned int)(c*(.1+.85))) |
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215 ((unsigned int)((0xFF*(1-((float)age)/EVENT_BUF_SIZE))) & 0xFF)<<24;
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216
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217 if(event.type == SDL_FINGERMOTION)
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218 drawCircle(screen,x*screen->w,y*screen->h,5,col);
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219 else if(event.type == SDL_FINGERDOWN)
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220 drawCircle(screen,x*screen->w,y*screen->h,-10,col);
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221 /*
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222 //if there is a centroid, draw it
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223 if(numDownFingers > 1) {
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224 unsigned int col =
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225 ((unsigned int)(0xFFFFFF)) |
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226 ((unsigned int)((0xFF*(1-((float)age)/EVENT_BUF_SIZE))) & 0xFF)<<24;
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227 drawCircle(screen,centroid.x*screen->w,centroid.y*screen->h,5,col);
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228 }
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229 */
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230 }
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231 }
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232
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233
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234 for(i=0;i<MAXFINGERS;i++)
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235 if(finger[i].p.x >= 0 && finger[i].p.y >= 0)
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236 if(finger[i].pressure > 0)
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237 drawCircle(screen,finger[i].p.x*screen->w,finger[i].p.y*screen->h
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238 ,20,0xFF*finger[i].pressure);
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239 else
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240 drawCircle(screen,finger[i].p.x*screen->w,finger[i].p.y*screen->h
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241 ,20,0xFF);
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242
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243
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244
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245 keystat[32] = 0;
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246
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247 if(knob.p.x > 0)
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248 drawKnob(screen,knob);
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249
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250 if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
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251
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252 SDL_Flip(screen);
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253 }
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254
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255 SDL_Surface* initScreen(int width,int height)
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256 {
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257 return SDL_SetVideoMode(width, height, DEPTH,
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258 SDL_HWSURFACE | SDL_RESIZABLE);
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259 }
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260
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261 int main(int argc, char* argv[])
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262 {
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263 SDL_Surface *screen;
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264 SDL_Event event;
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265
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266 int keypress = 0;
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267 int h=0,s=1,i,j;
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268
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269 //gesture variables
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270 int numDownFingers = 0;
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271 float gdtheta = 0,gdDist = 0;
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272 Point centroid;
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273 knob.r = .1;
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274 knob.ang = 0;
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275 TouchPoint gestureLast[MAXFINGERS];
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276
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277
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278
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279 memset(keystat,0,512*sizeof(keystat[0]));
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280 if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
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281
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282 if (!(screen = initScreen(WIDTH,HEIGHT)))
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283 {
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284 SDL_Quit();
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285 return 1;
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286 }
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287
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288 while(!keystat[27]) {
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289 //Poll SDL
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290 while(SDL_PollEvent(&event))
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291 {
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292 //Record _all_ events
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293 events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
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294 eventWrite++;
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295
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296 switch (event.type)
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297 {
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298 case SDL_QUIT:
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299 keystat[27] = 1;
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300 break;
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301 case SDL_KEYDOWN:
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302 //printf("%i\n",event.key.keysym.sym);
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303 keystat[event.key.keysym.sym] = 1;
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304 if(event.key.keysym.sym == 32) {
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305 SDL_RecordGesture(-1);
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306 }
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307 else if(event.key.keysym.sym == 115) {
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308 FILE *fp;
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309 fp = fopen("gestureSave","w");
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310 SDL_SaveAllDollarTemplates(fp);
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311 fclose(fp);
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312 }
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313 else if(event.key.keysym.sym == 108) {
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314 FILE *fp;
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315 fp = fopen("gestureSave","r");
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316 printf("Loaded: %i\n",SDL_LoadDollarTemplates(-1,fp));
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317 fclose(fp);
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318 }
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319
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320 //keypress = 1;
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321 break;
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322 case SDL_KEYUP:
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323 //printf("%i\n",event.key.keysym.sym);
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324 keystat[event.key.keysym.sym] = 0;
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325 //keypress = 1;
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326 break;
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327 case SDL_VIDEORESIZE:
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328 if (!(screen = initScreen(event.resize.w,
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329 event.resize.h)))
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330 {
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331 SDL_Quit();
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332 return 1;
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333 }
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334 break;
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335 case SDL_MOUSEMOTION:
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336 mousx = event.motion.x;
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337 mousy = event.motion.y;
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338 break;
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339 case SDL_MOUSEBUTTONDOWN:
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340 bstatus |= (1<<(event.button.button-1));
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341 break;
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342 case SDL_MOUSEBUTTONUP:
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343 bstatus &= ~(1<<(event.button.button-1));
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344 break;
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345 case SDL_FINGERMOTION:
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346 ;
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347 //printf("Finger: %i,x: %i, y: %i\n",event.tfinger.fingerId,
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348 // event.tfinger.x,event.tfinger.y);
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349 SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId);
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diff changeset
350 SDL_Finger* inFinger = SDL_GetFinger(inTouch,event.tfinger.fingerId);
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351
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352 for(i = 0;i<MAXFINGERS;i++)
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353 if(index2fingerid[i] == event.tfinger.fingerId)
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diff changeset
354 break;
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355 if(i == MAXFINGERS) break;
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356 if(inTouch > 0) {
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diff changeset
357 finger[i].p.x = ((float)event.tfinger.x)/
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diff changeset
358 inTouch->xres;
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diff changeset
359 finger[i].p.y = ((float)event.tfinger.y)/
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diff changeset
360 inTouch->yres;
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diff changeset
361
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diff changeset
362 finger[i].pressure =
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
363 ((float)event.tfinger.pressure)/inTouch->pressureres;
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diff changeset
364 /*
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
365 printf("Finger: %i, Pressure: %f Pressureres: %i\n",
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diff changeset
366 event.tfinger.fingerId,
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diff changeset
367 finger[i].pressure,
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diff changeset
368 inTouch->pressureres);
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369 */
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diff changeset
370 //printf("Finger: %i, pressure: %f\n",event.tfinger.fingerId,
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
371 // finger[event.tfinger.fingerId].pressure);
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diff changeset
372 }
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parents:
diff changeset
373
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diff changeset
374 break;
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375 case SDL_FINGERDOWN:
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diff changeset
376 printf("Finger: %i down - x: %i, y: %i\n",event.tfinger.fingerId,
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diff changeset
377 event.tfinger.x,event.tfinger.y);
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diff changeset
378
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diff changeset
379 for(i = 0;i<MAXFINGERS;i++)
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diff changeset
380 if(index2fingerid[i] == -1) {
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
381 index2fingerid[i] = event.tfinger.fingerId;
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diff changeset
382 break;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
383 }
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
384 finger[i].p.x = event.tfinger.x;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
385 finger[i].p.y = event.tfinger.y;
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diff changeset
386 break;
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diff changeset
387 case SDL_FINGERUP:
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diff changeset
388 printf("Figner: %i up - x: %i, y: %i\n",event.tfinger.fingerId,
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diff changeset
389 event.tfinger.x,event.tfinger.y);
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diff changeset
390 for(i = 0;i<MAXFINGERS;i++)
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diff changeset
391 if(index2fingerid[i] == event.tfinger.fingerId) {
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diff changeset
392 index2fingerid[i] = -1;
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diff changeset
393 break;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
394 }
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
395 finger[i].p.x = -1;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
396 finger[i].p.y = -1;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
397 break;
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diff changeset
398 case SDL_MULTIGESTURE:
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diff changeset
399 knob.p.x = event.mgesture.x;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
400 knob.p.y = event.mgesture.y;
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diff changeset
401 knob.ang += event.mgesture.dTheta;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
402 knob.r += event.mgesture.dDist;
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403 break;
063b9455bd1a Added some files I had previosuly missed
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diff changeset
404 case SDL_DOLLARGESTURE:
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diff changeset
405 printf("Gesture %lu performed, error: %f\n",
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diff changeset
406 event.dgesture.gestureId,
063b9455bd1a Added some files I had previosuly missed
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diff changeset
407 event.dgesture.error);
063b9455bd1a Added some files I had previosuly missed
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diff changeset
408 break;
063b9455bd1a Added some files I had previosuly missed
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diff changeset
409 case SDL_DOLLARRECORD:
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diff changeset
410 printf("Recorded gesture: %lu\n",event.dgesture.gestureId);
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diff changeset
411 break;
4657
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
412 }
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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parents:
diff changeset
413 }
4659
063b9455bd1a Added some files I had previosuly missed
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diff changeset
414 DrawScreen(screen,h);
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diff changeset
415 for(i = 0; i < 256; i++)
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diff changeset
416 if(keystat[i])
063b9455bd1a Added some files I had previosuly missed
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diff changeset
417 printf("Key %i down\n",i);
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diff changeset
418 }
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
419 SDL_Quit();
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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parents:
diff changeset
420
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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diff changeset
421 return 0;
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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parents:
diff changeset
422 }
eed063a0bf5b Moved Multi finger gesture recognition into the library.
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parents:
diff changeset
423