libresman: a42888d26839 examples/imgthumbs/src/main.c

libresman

view examples/imgthumbs/src/main.c @ 13:a42888d26839

bit more progress...

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 08 Feb 2014 07:41:39 +0200
parents	410c19c735b2
children	0a789208498d

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <assert.h>

4 #include <imago2.h>

5 #include "opengl.h"

6 #include "resman.h"

7 #include "thumbs.h"

9 static int init(void);

10 static void cleanup(void);

11 static void display(void);

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

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

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

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

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

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

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

20 const char *path = ".";

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 glutIdleFunc(glutPostRedisplay);

44 glutReshapeFunc(reshape);

45 glutKeyboardFunc(keyb);

46 glutMouseFunc(mouse);

47 glutMotionFunc(motion);

48 glutSpaceballMotionFunc(sball_motion);

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

51 return 1;

52 }

53 atexit(cleanup);

55 glutMainLoop();

56 return 0;

57 }

59 static int init(void)

60 {

61 thumbs = create_thumbs(path);

62 return 0;

63 }

65 static void cleanup(void)

66 {

67 free_thumbs(thumbs);

68 }

70 static void display(void)

71 {

72 update_thumbs();

74 glClear(GL_COLOR_BUFFER_BIT);

76 glMatrixMode(GL_MODELVIEW);

77 glLoadIdentity();

79 if(show_thumb) {

80 glEnable(GL_TEXTURE_2D);

81 glBindTexture(GL_TEXTURE_2D, show_thumb->tex);

83 glScalef(show_zoom, show_zoom, 1);

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

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

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

87 } else {

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

89 }

91 glBegin(GL_QUADS);

92 glColor3f(1, 1, 1);

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

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

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

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

97 glEnd();

99 glDisable(GL_TEXTURE_2D);

100 } else {

101 draw_thumbs(thumbs, thumbs_size, pan_y);

102 }

103

104 glutSwapBuffers();

105 assert(glGetError() == GL_NO_ERROR);

106 }

107

108 /*

109 static void idle(void)

110 {

111 glutPostRedisplay();

112 }

113 */

114

115 static void reshape(int x, int y)

116 {

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

118

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

120

121 glMatrixMode(GL_PROJECTION);

122 glLoadIdentity();

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

124

125 win_width = x;

126 win_height = y;

127 }

128

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

130 {

131 switch(key) {

132 case 27:

133 if(show_thumb) {

134 show_thumb = 0;

135 glutPostRedisplay();

136 } else {

137 exit(0);

138 }

139 break;

140

141 case ' ':

142 show_zoom = 1.0;

143 thumbs_size = 0.25;

144 pan_x = pan_y = show_pan_x = show_pan_y = 0;

145 glutPostRedisplay();

146 break;

147 }

148 }

149

150 static int bnstate[32];

151 static int prev_x, prev_y;

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

153

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

155 {

156 int bidx = bn - GLUT_LEFT_BUTTON;

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

158

159 bnstate[bidx] = state;

160

161 prev_x = x;

162 prev_y = y;

163

164 if(state) {

165 click_x[bidx] = x;

166 click_y[bidx] = y;

167 } else {

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

169

170 if(bidx == 0) {

171 if(!show_thumb) {

172 if(!is_drag) {

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

174 if(sel) {

175 show_thumb = sel;

176 show_pan_x = show_pan_y = 0;

177 glutPostRedisplay();

178 }

179 }

180 }

181 } else {

182 if(!is_drag) {

183 show_thumb = 0;

184 glutPostRedisplay();

185 }

186 }

187 }

188 }

189

190 static void motion(int x, int y)

191 {

192 int dx = x - prev_x;

193 int dy = y - prev_y;

194 prev_x = x;

195 prev_y = y;

196

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

198

199 if(bnstate[0]) {

200 float fdx = dx / (float)win_width;

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

202

203 if(show_thumb) {

204 show_pan_x += fdx / show_zoom;

205 show_pan_y += fdy / show_zoom;

206 } else {

207 pan_x += fdx;

208 pan_y += fdy;

209 }

210 glutPostRedisplay();

211 }

212

213 if(bnstate[2]) {

214 if(show_thumb) {

215 show_zoom -= dy * 0.0075;

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

217 } else {

218 thumbs_size -= dy * 0.005;

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

220 }

221 glutPostRedisplay();

222 }

223 }

224

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

226 {

227 float fx = -x * 0.0004;

228 float fy = z * 0.0004;

229 float fz = -y * 0.0005;

230

231 if(show_thumb) {

232 show_pan_x += fx / show_zoom;

233 show_pan_y += fy / show_zoom;

234 show_zoom += fz;

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

236 } else {

237 pan_x += fx;

238 pan_y += fy;

239 thumbs_size += fz;

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

241 }

242 glutPostRedisplay();

243 }

244

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

246 {

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

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

249 struct thumbnail *node;

250

251 node = thumbs;

252 while(node) {

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

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

255

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

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

258 return node;

259 }

260 node = node->next;

261 }

262 return 0;

263 }