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网站开发项目合同书,福建做网站,学会了vue 能搭建一个网站平台,金融网站排名优化文章目录 FLTK - FLTK1.4.1 - demo - animgifimage概述笔记END FLTK - FLTK1.4.1 - demo - animgifimage 概述 知识点: 注册图像文件类型判断回调 FLTK支持的图像格式 GIF, BMP, ICO, PNM, PNG, jpg, svg 事件回调的注册 GIF图像显示为图片或动画的标志设置 // 超时回调的设置… 文章目录 FLTK - FLTK1.4.1 - demo - animgifimage概述笔记END FLTK - FLTK1.4.1 - demo - animgifimage 概述 知识点: 注册图像文件类型判断回调 FLTK支持的图像格式 GIF, BMP, ICO, PNM, PNG, jpg, svg 事件回调的注册 GIF图像显示为图片或动画的标志设置 // 超时回调的设置和移除, 超时回调是一次性的如果还需要同一个超时回调需要再次设置超时回调 // 文件选择器UI的调用和返回 // 用户选择通过文件选择器选择的文件有可能不是指定尾缀的文件类型 // fltk窗口的遍历 // fltk窗口 背景颜色设置 Fl_Color // fltk窗口退出回调的设置 // 图像数据载入成功和图像数据有效的判断 // 图像关键数据(长宽帧数)的取得 // fltk窗口类的copy_x()是复制了一份数据并不是指向原始数据 // fltk图像类禁用缓存 // fltk窗体禁止响应快捷键的窗体size缩放 // 等待当前窗体正常结束 // fltk类的构造函数是通过弹窗来报错的(e.g. 图像文件格式错), 这个报错信息不是API调用者能控制的。 笔记 // FLTK - FLTK1.4.1 - demo - animgifimage /* 知识点:注册图像文件类型判断回调FLTK支持的图像格式 GIF, BMP, ICO, PNM, PNG, jpg, svg事件回调的注册GIF图像显示为图片或动画的标志设置// 超时回调的设置和移除, 超时回调是一次性的如果还需要同一个超时回调需要再次设置超时回调// 文件选择器UI的调用和返回// 用户选择通过文件选择器选择的文件有可能不是指定尾缀的文件类型// fltk窗口的遍历// fltk窗口 背景颜色设置 Fl_Color// fltk窗口退出回调的设置// 图像数据载入成功和图像数据有效的判断// 图像关键数据(长宽帧数)的取得// fltk窗口类的copy_x()是复制了一份数据并不是指向原始数据// fltk图像类禁用缓存// fltk窗体禁止响应快捷键的窗体size缩放// 等待当前窗体正常结束// fltk类的构造函数是通过弹窗来报错的(e.g. 图像文件格式错), 这个报错信息不是API调用者能控制的。 /#include fltk_test.h// 如果要将fl demo的实现搬过来测试就注释掉下面的宏 // #define DONT_USE_FL_DEMO#ifdef DONT_USE_FL_DEMO int fl_demo_main(int argc, char** argv) {return 0; }#else#endif // TEST_FL_DEMO// // Test program for displaying animated GIF files using the // Fl_Anim_GIF_Image class. // #include FL/Fl_Anim_GIF_Image.H#include FL/Fl_Double_Window.H #include FL/Fl_File_Chooser.H #include FL/Fl_Shared_Image.H #include FL/Fl_Tiled_Image.H #include stdlib.hstatic int g_good_count 0, g_bad_count 0, g_frame_count 0;static const Fl_Color BackGroundColor FL_GRAY; // use e.g. FL_RED to see// transparent parts better static const double RedrawDelay 30 / 1. / 20/ ; // interval [sec] for forced redrawstatic void quit_cb(Fl_Widget w_, void) {exit(0); }static void set_title(Fl_Window win, Fl_Anim_GIF_Image* animgif) {char buf[200];snprintf(buf, sizeof(buf), %s (%d frames) %2.2fx, fl_filename_name(animgif-name()),animgif-frames(), animgif-speed());if (animgif-frame_uncache())strcat(buf, U);// fltk窗口类的copy_x()是复制了一份数据并不是指向原始数据win-copy_label(buf);win-copy_tooltip(buf); }static void cb_forced_redraw(void* d) {// fltk窗口的遍历Fl_Window* win Fl::first_window();while (win) {if (!win-menu_window())win-redraw();win Fl::next_window(win);}if (Fl::first_window())Fl::repeat_timeout(RedrawDelay, cb_forced_redraw); }Fl_Window* openFile(const char* name, char* flags, bool close false) {// determine test options from flagsbool uncache strchr(flags, u);char* d flags - 1;int debug 0;while ((d strchr(d, d))) debug;bool optimize_mem strchr(flags, m);bool desaturate strchr(flags, D);bool average strchr(flags, A);bool test_tiles strchr(flags, T);bool test_forced_redraw strchr(flags, f);char* r strchr(flags, r);bool resizable r !test_tiles;double scale 1.0;if (r resizable) scale atof(r 1);if (scale 0.1 || scale 5)scale resizable ? 0.7 : 1.0;// setup windowFl::remove_timeout(cb_forced_redraw);Fl_Double_Window* win new Fl_Double_Window(300, 300);// fltk窗口 背景颜色设置 Fl_Colorwin-color(BackGroundColor);if (close){// fltk窗口退出回调的设置win-callback(quit_cb);}printf(Loading %s%s%s … , name,uncache ? (uncached) : ,optimize_mem ? (optimized) : );// create a canvas for the animationFl_Box* canvas test_tiles ? 0 : new Fl_Box(0, 0, 0, 0); // canvas will be resized by animationFl_Box* canvas2 0;unsigned short gif_flags debug ? Fl_Anim_GIF_Image::LOG_FLAG : 0;if (debug 1)gif_flags | Fl_Anim_GIF_Image::DEBUG_FLAG;if (optimize_mem)gif_flags | Fl_Anim_GIF_Image::OPTIMIZE_MEMORY;// create animation, specifying this canvas as display widget// fltk类的构造函数是通过弹窗来报错的(e.g. 图像文件格式错), 这个报错信息不是API调用者能控制的。Fl_Anim_GIF_Image* animgif new Fl_Anim_GIF_Image(name, canvas, gif_flags);// 图像数据载入成功和图像数据有效的判断bool good(animgif-ld() 0 animgif-valid());// 图像关键数据(长宽帧数)的取得printf(%s: %d x %d (%d frames) %s\n,animgif-name(), animgif-w(), animgif-h(), animgif-frames(), good ? OK : ERROR);// for the statistics (when run on testsuite):g_good_count good;g_bad_count !good;g_frame_count animgif-frames();// 设置窗体的用户数据win-user_data(animgif); // store address of image (see note in main())// exercise the optional tests on the animation// fltk图像类禁用缓存animgif-frame_uncache(uncache);if (scale ! 1.0) {animgif-resize(scale);printf(TEST: resized %s by %.2f to %d x %d\n, animgif-name(), scale, animgif-w(), animgif-h());}if (average) {printf(TEST: color_average %s\n, animgif-name());animgif-color_average(FL_GREEN, 0.5); // currently hardcoded}if (desaturate) {printf(TEST: desaturate %s\n, animgif-name());animgif-desaturate();}int W animgif-w();int H animgif-h();if (animgif-frames()) {if (test_tiles) {// demonstrate a way how to use the animation with Fl_Tiled_Imageprintf(TEST: use %s as tiles\n, animgif-name());W * 2;H * 2;Fl_Tiled_Image* tiled_image new Fl_Tiled_Image(animgif);Fl_Group* group new Fl_Group(0, 0, win-w(), win-h());group-image(tiled_image);group-align(FL_ALIGN_INSIDE);animgif-canvas(group, Fl_Anim_GIF_Image::DONT_RESIZE_CANVAS | Fl_Anim_GIF_Image::DONT_SET_AS_IMAGE);win-resizable(group);}else {// demonstrate a way how to use same animation in another canvas simultaneously:// as the current implementation allows only automatic redraw of one canvas..if (test_forced_redraw) {if (W 400) {printf(TEST: open %s in another animation with application redraw\n, animgif-name());canvas2 new Fl_Box(W, 0, animgif-w(), animgif-h()); // another canvas for animationcanvas2-image(animgif); // is set to same animation!W * 2;Fl::add_timeout(RedrawDelay, cb_forced_redraw); // force periodic redraw}}}// make window resizable (must be done before show())if (resizable canvas !test_tiles) {win-resizable(win);}win-size(W, H); // change to actual size of canvas// start the animationwin-end();win-show();win-wait_for_expose();set_title(win, animgif);if (resizable !test_tiles) {// need to reposition the widgets (have been moved by setting resizable())if (canvas canvas2) {canvas-resize(0, 0, W / 2, canvas-h());canvas2-resize(W / 2, 0, W / 2, canvas2-h());}else if (canvas) {canvas-resize(0, 0, animgif-canvas_w(), animgif-canvas_h());}}// fltk窗体禁止响应快捷键的窗体size缩放win-init_sizes(); // IMPORTANT: otherwise weird things happen at Ctrl/- scaling}else {delete win;return 0;}if (debug 3) {// open each frame in a separate windowfor (int i 0; i animgif-frames(); i) {char buf[200];snprintf(buf, sizeof(buf), Frame #%d, i 1);Fl_Double_Window* win new Fl_Double_Window(animgif-w(), animgif-h());win-copy_tooltip(buf);win-copy_label(buf);win-color(BackGroundColor);int w animgif-image(i)-w();int h animgif-image(i)-h();// in optimize_mem mode frames must be offsetted to canvasint x (w animgif-w() h animgif-h()) ? 0 : animgif-frame_x(i);int y (w animgif-w() h animgif-h()) ? 0 : animgif-frame_y(i);Fl_Box* b new Fl_Box(x, y, w, h);// get the frame imageb-image(animgif-image(i));win-end();win-show();}}return win; }#include FL/filename.H bool openDirectory(const char* dir, char* flags) {dirent** list;int nbr_of_files fl_filename_list(dir, list, fl_alphasort);if (nbr_of_files 0)return false;int cnt 0;for (int i 0; i nbr_of_files; i) {char buf[512];const char* name list[i]-d_name;if (!strcmp(name, .) || !strcmp(name, ..)) continue;const char* p strstr(name, .gif);if (!p) p strstr(name, .GIF);if (!p) continue;if ((p 4)) continue; // is no extension!snprintf(buf, sizeof(buf), %s/%s, dir, name);if (strstr(name, debug)) // hack: when name contains debug open single framesstrcat(flags, d);if (openFile(buf, flags, cnt 0))cnt;}return cnt ! 0; }static void change_speed(double delta) {Fl_Widget below Fl::belowmouse();if (below below-image()) {Fl_Anim_GIF_Image* animgif 0;// Q: is there a way to determine Fl_Tiled_Image without using dynamic cast?Fl_Tiled_Image* tiled dynamic_castFl_Tiled_Image(below-image());animgif tiled ?dynamic_castFl_Anim_GIF_Image(tiled-image()) :dynamic_castFl_Anim_GIF_Image(below-image());if (animgif animgif-playing()) {double speed animgif-speed();if (!delta) speed 1.;else speed delta;if (speed 0.1) speed 0.1;if (speed 10) speed 10;animgif-speed(speed);set_title(below-window(), animgif);}} }static int events(int event) {if (event FL_SHORTCUT) {if (Fl::event_key() )change_speed(0.1);else if (Fl::event_key() -)change_speed(-0.1);else if (Fl::event_key() 0)change_speed(0);elsereturn 0;return 1;}return 0; }static const char testsuite[] testsuite;int fl_demo_main(int argc, char argv[]) {// 注册图像文件类型判断回调fl_register_images();// 事件回调的注册Fl::add_handler(events);char* openFlags (char)calloc(1024, 1);if (argc 1) {// started with argumemtsif (strstr(argv[1], -h)) {printf(Usage:\n -t [directory] [-{flags}] open all files in directory (default name: %s) [with options]\n filename [-{flags}] open single file [with options] \n No arguments open a fileselector\n {flags} can be: ddebug mode, uuncached, Ddesaturated, Acolor averaged, Ttiled\n mminimal update, r[scale factor]resize by scale factor\n Use keys /-/0 to change speed of the active image (belowmouse).\n, testsuite);exit(1);}for (int i 1; i argc; i) {if (argv[i][0] -)strcat(openFlags, argv[i][1]);}if (strchr(openFlags, t)) { // open all GIF-files in a given directoryconst char dir testsuite;for (int i 2; i argc; i)if (argv[i][0] ! -)dir argv[i];openDirectory(dir, openFlags);printf(Summary: good%d, bad%d, frames%d\n, g_good_count, g_bad_count, g_frame_count);}else { // open given file(s)for (int i 1; i argc; i)if (argv[i][0] ! -)openFile(argv[i], openFlags, strchr(openFlags, d));}}else {// started without arguments: choose file// GIF图像显示为图片或动画的标志设置Fl_GIF_Image::animate true; // create animated shared .GIF images (e.g. file chooser)while (1) {Fl::add_timeout(RedrawDelay, cb_forced_redraw); // animate images in chooser// 文件选择器UI的调用和返回// 用户选择通过文件选择器选择的文件有可能不是指定尾缀的文件类型const char* filename fl_file_chooser(Select a GIF image file, .{gif,GIF}, NULL);// 超时回调的移除Fl::remove_timeout(cb_forced_redraw);if (!filename)break;Fl_Window win openFile(filename, openFlags);// 等待当前窗体正常结束Fl::run();// delete last window (which is now just hidden) to test destructors// NOTE: it is essential that before doing this also the// animated image is destroyed, otherwise it will crash// because its canvas will be gone.// In order to keep this demo simple, the adress of the// Fl_Anim_GIF_Image has been stored in the windows user_data.// In a real-life application you will probably store// it somewhere in the windows or canvas object and destroy// the image in the windows or canvas destructor.if (win win-user_data())delete ((Fl_Anim_GIF_Image*)win-user_data());delete win;}}return Fl::run(); } END