libresman: bd9b4ff19c93 examples/imgthumbs/src/main.c

libresman

view examples/imgthumbs/src/main.c @ 5:bd9b4ff19c93

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 01 Feb 2014 08:02:08 +0200
parents	a396d43a62f9
children	410c19c735b2

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <assert.h>

4 #include "opengl.h"

5 #include "resman.h"

6 #include "thumbs.h"

8 static int init(void);

9 static void cleanup(void);

10 static void display(void);

11 /*static void idle(void);*/

12 static void reshape(int x, int y);

13 static void keyb(unsigned char key, int x, int y);

14 static void mouse(int bn, int st, int x, int y);

15 static void motion(int x, int y);

16 static void sball_motion(int x, int y, int z);

17 static struct thumbnail *find_thumb(int x, int y);

19 const char *path = ".";

20 struct resman *texman;

21 int win_width, win_height;

22 float win_aspect;

23 float pan_x, pan_y;

24 float show_pan_x, show_pan_y;

25 float show_zoom = 1.0;

26 float thumbs_size = 0.25;

28 struct thumbnail *thumbs, *show_thumb;

30 int main(int argc, char **argv)

31 {

32 glutInitWindowSize(1024, 768);

33 glutInit(&argc, argv);

35 if(argv[1]) {

36 path = argv[1];

37 }

39 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);

40 glutCreateWindow("imgthumbs");

42 glutDisplayFunc(display);

43 glutReshapeFunc(reshape);

44 glutKeyboardFunc(keyb);

45 glutMouseFunc(mouse);

46 glutMotionFunc(motion);

47 glutSpaceballMotionFunc(sball_motion);

49 if(init() == -1) {

50 return 1;

51 }

52 atexit(cleanup);

54 glutMainLoop();

55 return 0;

56 }

58 static int init(void)

59 {

60 glewInit();

62 thumbs = create_thumbs(path);

63 return 0;

64 }

66 static void cleanup(void)

67 {

68 free_thumbs(thumbs);

69 }

71 static void display(void)

72 {

73 glClear(GL_COLOR_BUFFER_BIT);

75 glMatrixMode(GL_MODELVIEW);

76 glLoadIdentity();

78 if(show_thumb) {

79 glEnable(GL_TEXTURE_2D);

80 glBindTexture(GL_TEXTURE_2D, show_thumb->tex);

82 glScalef(show_zoom, show_zoom, 1);

83 glTranslatef(2.0 * show_pan_x, 2.0 * show_pan_y, 0);

84 if(show_thumb->aspect >= win_aspect) {

85 glScalef(1, 1.0 / show_thumb->aspect, 1);

86 } else {

87 glScalef(show_thumb->aspect / win_aspect, 1.0 / win_aspect, 1);

88 }

90 glBegin(GL_QUADS);

91 glColor3f(1, 1, 1);

92 glTexCoord2f(0, 0); glVertex2f(-1, -1);

93 glTexCoord2f(1, 0); glVertex2f(1, -1);

94 glTexCoord2f(1, 1); glVertex2f(1, 1);

95 glTexCoord2f(0, 1); glVertex2f(-1, 1);

96 glEnd();

98 glDisable(GL_TEXTURE_2D);

99 } else {

100 draw_thumbs(thumbs, thumbs_size, pan_y);

101 }

102

103 glutSwapBuffers();

104 assert(glGetError() == GL_NO_ERROR);

105 }

106

107 /*

108 static void idle(void)

109 {

110 glutPostRedisplay();

111 }

112 */

113

114 static void reshape(int x, int y)

115 {

116 win_aspect = (float)x / (float)y;

117

118 glViewport(0, 0, x, y);

119

120 glMatrixMode(GL_PROJECTION);

121 glLoadIdentity();

122 glOrtho(-1, 1, 1.0 / win_aspect, -1.0 / win_aspect, -1, 1);

123

124 win_width = x;

125 win_height = y;

126 }

127

128 static void keyb(unsigned char key, int x, int y)

129 {

130 switch(key) {

131 case 27:

132 if(show_thumb) {

133 show_thumb = 0;

134 glutPostRedisplay();

135 } else {

136 exit(0);

137 }

138 break;

139

140 case ' ':

141 show_zoom = 1.0;

142 thumbs_size = 0.25;

143 pan_x = pan_y = show_pan_x = show_pan_y = 0;

144 glutPostRedisplay();

145 break;

146 }

147 }

148

149 static int bnstate[32];

150 static int prev_x, prev_y;

151 static int click_x[32], click_y[32];

152

153 static void mouse(int bn, int st, int x, int y)

154 {

155 int bidx = bn - GLUT_LEFT_BUTTON;

156 int state = st == GLUT_DOWN ? 1 : 0;

157

158 bnstate[bidx] = state;

159

160 prev_x = x;

161 prev_y = y;

162

163 if(state) {

164 click_x[bidx] = x;

165 click_y[bidx] = y;

166 } else {

167 int is_drag = abs(x - click_x[bidx]) > 3 || abs(y - click_y[bidx]) > 3;

168

169 if(bidx == 0) {

170 if(!show_thumb) {

171 if(!is_drag) {

172 struct thumbnail *sel = find_thumb(x, y);

173 if(sel) {

174 show_thumb = sel;

175 show_pan_x = show_pan_y = 0;

176 glutPostRedisplay();

177 }

178 }

179 }

180 } else {

181 if(!is_drag) {

182 show_thumb = 0;

183 glutPostRedisplay();

184 }

185 }

186 }

187 }

188

189 static void motion(int x, int y)

190 {

191 int dx = x - prev_x;

192 int dy = y - prev_y;

193 prev_x = x;

194 prev_y = y;

195

196 if(!dx && !dy) return;

197

198 if(bnstate[0]) {

199 float fdx = dx / (float)win_width;

200 float fdy = dy / (float)win_height / win_aspect;

201

202 if(show_thumb) {

203 show_pan_x += fdx / show_zoom;

204 show_pan_y += fdy / show_zoom;

205 } else {

206 pan_x += fdx;

207 pan_y += fdy;

208 }

209 glutPostRedisplay();

210 }

211

212 if(bnstate[2]) {

213 if(show_thumb) {

214 show_zoom -= dy * 0.0075;

215 if(show_zoom <= 0) show_zoom = 0;

216 } else {

217 thumbs_size -= dy * 0.005;

218 if(thumbs_size <= 0.01) thumbs_size = 0.01;

219 }

220 glutPostRedisplay();

221 }

222 }

223

224 static void sball_motion(int x, int y, int z)

225 {

226 float fx = -x * 0.0004;

227 float fy = z * 0.0004;

228 float fz = -y * 0.0005;

229

230 if(show_thumb) {

231 show_pan_x += fx / show_zoom;

232 show_pan_y += fy / show_zoom;

233 show_zoom += fz;

234 if(show_zoom <= 0) show_zoom = 0;

235 } else {

236 pan_x += fx;

237 pan_y += fy;

238 thumbs_size += fz;

239 if(thumbs_size <= 0.01) thumbs_size = 0.01;

240 }

241 glutPostRedisplay();

242 }

243

244 static struct thumbnail *find_thumb(int x, int y)

245 {

246 float fx = (float)x / (float)win_width;

247 float fy = (float)y / (float)win_height / win_aspect;

248 struct thumbnail *node;

249

250 node = thumbs;

251 while(node) {

252 float nx = node->layout_pos[0];

253 float ny = node->layout_pos[1];

254

255 if(fx >= nx && fx < nx + node->layout_size[0] &&

256 fy >= ny && fy < ny + node->layout_size[1]) {

257 return node;

258 }

259 node = node->next;

260 }

261 return 0;

262 }