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annotate src/events/SDL_gesture.c @ 4657:eed063a0bf5b

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Moved Multi finger gesture recognition into the library.
author Jim Grandpre <jim.tla@gmail.com>
date Wed, 07 Jul 2010 04:13:08 -0700
parents
children 454385d76845
rev   line source
4657
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* General mouse handling code for SDL */
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25
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26 #include "SDL_events.h"
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27 #include "SDL_events_c.h"
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28 #include "SDL_gesture_c.h"
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29
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30 //TODO: Replace with malloc
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31 #define MAXFINGERS 3
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32 #define MAXTOUCHES 2
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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
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39 typedef struct {
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40 Point p;
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41 float pressure;
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42 int id;
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43 } Finger;
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44
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45 typedef struct {
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46 Finger f;
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47 Point cv;
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48 float dtheta,dDist;
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49 } TouchPoint;
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50
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51
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52 typedef struct {
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53 int id;
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54 Point res;
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55 Point centroid;
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56 TouchPoint gestureLast[MAXFINGERS];
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57 int numDownFingers;
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58 } GestureTouch;
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59
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60 GestureTouch gestureTouch[MAXTOUCHES];
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61 int numGestureTouches = 0;
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62 int SDL_GestureAddTouch(SDL_Touch* touch) {
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63 if(numGestureTouches >= MAXTOUCHES) return -1;
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64
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65 gestureTouch[numGestureTouches].res.x = touch->xres;
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66 gestureTouch[numGestureTouches].res.y = touch->yres;
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67 gestureTouch[numGestureTouches].numDownFingers = 0;
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68
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69 gestureTouch[numGestureTouches].res.x = touch->xres;
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70 gestureTouch[numGestureTouches].id = touch->id;
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71
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72 numGestureTouches++;
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73 return 0;
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74 }
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75
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76 GestureTouch * SDL_GetGestureTouch(int id) {
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77 int i;
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78 for(i = 0;i < numGestureTouches; i++) {
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79 //printf("%i ?= %i\n",gestureTouch[i].id,id);
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80 if(gestureTouch[i].id == id) return &gestureTouch[i];
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81 }
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82 return NULL;
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83 }
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84
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85 int SDL_SendGestureMulti(GestureTouch* touch,float dTheta,float dDist) {
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86 SDL_Event event;
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87 event.mgesture.type = SDL_MULTIGESTURE;
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88 event.mgesture.touchId = touch->id;
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89 event.mgesture.x = touch->centroid.x;
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90 event.mgesture.y = touch->centroid.y;
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91 event.mgesture.dTheta = dTheta;
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92 event.mgesture.dDist = dDist;
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93 return SDL_PushEvent(&event) > 0;
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94 }
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95
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96 void SDL_GestureProcessEvent(SDL_Event* event)
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97 {
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98 if(event->type == SDL_FINGERMOTION ||
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99 event->type == SDL_FINGERDOWN ||
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100 event->type == SDL_FINGERUP) {
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101 GestureTouch* inTouch = SDL_GetGestureTouch(event->tfinger.touchId);
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102
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103
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104 //Shouldn't be possible
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105 if(inTouch == NULL) return;
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106
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107
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108 float x = ((float)event->tfinger.x)/inTouch->res.x;
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109 float y = ((float)event->tfinger.y)/inTouch->res.y;
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110 int j,empty = -1;
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111
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112 for(j = 0;j<inTouch->numDownFingers;j++) {
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113 if(inTouch->gestureLast[j].f.id != event->tfinger.fingerId) continue;
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114
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115 if(event->type == SDL_FINGERUP) {
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116 inTouch->numDownFingers--;
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117 inTouch->gestureLast[j] = inTouch->gestureLast[inTouch->numDownFingers];
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118 break;
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119 }
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120 else {
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121 float dx = x - inTouch->gestureLast[j].f.p.x;
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122 float dy = y - inTouch->gestureLast[j].f.p.y;
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123 inTouch->centroid.x += dx/inTouch->numDownFingers;
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124 inTouch->centroid.y += dy/inTouch->numDownFingers;
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125 if(inTouch->numDownFingers > 1) {
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126 Point lv; //Vector from centroid to last x,y position
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127 Point v; //Vector from centroid to current x,y position
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128 lv = inTouch->gestureLast[j].cv;
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129 float lDist = sqrt(lv.x*lv.x + lv.y*lv.y);
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130 //printf("lDist = %f\n",lDist);
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131 v.x = x - inTouch->centroid.x;
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132 v.y = y - inTouch->centroid.y;
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133 inTouch->gestureLast[j].cv = v;
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134 float Dist = sqrt(v.x*v.x+v.y*v.y);
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135 // cos(dTheta) = (v . lv)/(|v| * |lv|)
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136
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137 //Normalize Vectors to simplify angle calculation
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138 lv.x/=lDist;
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139 lv.y/=lDist;
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140 v.x/=Dist;
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141 v.y/=Dist;
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142 float dtheta = atan2(lv.x*v.y - lv.y*v.x,lv.x*v.x + lv.y*v.y);
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143
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144 float dDist = (Dist - lDist);
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145 if(lDist == 0) {dDist = 0;dtheta = 0;} //To avoid impossible values
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146 inTouch->gestureLast[j].dDist = dDist;
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147 inTouch->gestureLast[j].dtheta = dtheta;
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148
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149 //printf("dDist = %f, dTheta = %f\n",dDist,dtheta);
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150 //gdtheta = gdtheta*.9 + dtheta*.1;
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151 //gdDist = gdDist*.9 + dDist*.1
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152 //knob.r += dDist/numDownFingers;
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153 //knob.ang += dtheta;
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154 //printf("thetaSum = %f, distSum = %f\n",gdtheta,gdDist);
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155 //printf("id: %i dTheta = %f, dDist = %f\n",j,dtheta,dDist);
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156 SDL_SendGestureMulti(inTouch,dtheta,dDist);
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157 }
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158 else {
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159 inTouch->gestureLast[j].dDist = 0;
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160 inTouch->gestureLast[j].dtheta = 0;
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161 inTouch->gestureLast[j].cv.x = 0;
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162 inTouch->gestureLast[j].cv.y = 0;
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163 }
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164 inTouch->gestureLast[j].f.p.x = x;
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165 inTouch->gestureLast[j].f.p.y = y;
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166 break;
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167 //pressure?
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168 }
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169 }
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170
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171 if(j == inTouch->numDownFingers) {
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172 //printf("Finger Down!!!\n");
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173 inTouch->numDownFingers++;
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174 inTouch->centroid.x = (inTouch->centroid.x*(inTouch->numDownFingers - 1)+
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175 x)/inTouch->numDownFingers;
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176 inTouch->centroid.y = (inTouch->centroid.y*(inTouch->numDownFingers - 1)+
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177 y)/inTouch->numDownFingers;
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178
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179 inTouch->gestureLast[j].f.id = event->tfinger.fingerId;
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180 inTouch->gestureLast[j].f.p.x = x;
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181 inTouch->gestureLast[j].f.p.y = y;
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182 inTouch->gestureLast[j].cv.x = 0;
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183 inTouch->gestureLast[j].cv.y = 0;
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184 }
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185 }
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186 }
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187
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188 /* vi: set ts=4 sw=4 expandtab: */
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189