libresman: 6b9974a8bdae examples/imgthumbs/src/main.c

libresman

view examples/imgthumbs/src/main.c @ 26:6b9974a8bdae

started BSD/mac support for file watching

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 31 Mar 2014 19:51:00 +0300
parents	bebc065a941f
children

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(idle);

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 static void idle(void)

109 {

110 glutPostRedisplay();

111 }

112

113 static void reshape(int x, int y)

114 {

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

116

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

118

119 glMatrixMode(GL_PROJECTION);

120 glLoadIdentity();

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

122

123 win_width = x;

124 win_height = y;

125 }

126

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

128 {

129 switch(key) {

130 case 27:

131 if(show_thumb) {

132 show_thumb = 0;

133 glutPostRedisplay();

134 } else {

135 exit(0);

136 }

137 break;

138

139 case ' ':

140 show_zoom = 1.0;

141 thumbs_size = 0.25;

142 pan_x = pan_y = show_pan_x = show_pan_y = 0;

143 glutPostRedisplay();

144 break;

145 }

146 }

147

148 static int bnstate[32];

149 static int prev_x, prev_y;

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

151

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

153 {

154 int bidx = bn - GLUT_LEFT_BUTTON;

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

156

157 bnstate[bidx] = state;

158

159 prev_x = x;

160 prev_y = y;

161

162 if(state) {

163 click_x[bidx] = x;

164 click_y[bidx] = y;

165 } else {

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

167

168 if(bidx == 0) {

169 if(!show_thumb) {

170 if(!is_drag) {

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

172 if(sel) {

173 show_thumb = sel;

174 show_pan_x = show_pan_y = 0;

175 glutPostRedisplay();

176 }

177 }

178 }

179 } else {

180 if(!is_drag) {

181 show_thumb = 0;

182 glutPostRedisplay();

183 }

184 }

185 }

186 }

187

188 static void motion(int x, int y)

189 {

190 int dx = x - prev_x;

191 int dy = y - prev_y;

192 prev_x = x;

193 prev_y = y;

194

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

196

197 if(bnstate[0]) {

198 float fdx = dx / (float)win_width;

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

200

201 if(show_thumb) {

202 show_pan_x += fdx / show_zoom;

203 show_pan_y += fdy / show_zoom;

204 } else {

205 pan_x += fdx;

206 pan_y += fdy;

207 }

208 glutPostRedisplay();

209 }

210

211 if(bnstate[2]) {

212 if(show_thumb) {

213 show_zoom -= dy * 0.0075;

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

215 } else {

216 thumbs_size -= dy * 0.005;

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

218 }

219 glutPostRedisplay();

220 }

221 }

222

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

224 {

225 float fx = -x * 0.0004;

226 float fy = z * 0.0004;

227 float fz = -y * 0.0005;

228

229 if(show_thumb) {

230 show_pan_x += fx / show_zoom;

231 show_pan_y += fy / show_zoom;

232 show_zoom += fz;

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

234 } else {

235 pan_x += fx;

236 pan_y += fy;

237 thumbs_size += fz;

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

239 }

240 glutPostRedisplay();

241 }

242

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

244 {

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

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

247 struct thumbnail *node;

248

249 node = thumbs;

250 while(node) {

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

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

253

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

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

256 return node;

257 }

258 node = node->next;

259 }

260 return 0;

261 }