mirror of https://github.com/fltk/fltk
109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
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// Test of class Fl_Image
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//
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// Notice that Fl_Image is for a static, multiple-reuse image, such
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// as an icon or postage stamp. Use fl_draw_image to go directly
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// from an buffered image that changes often.
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#include <FL/Fl.H>
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#include <FL/Fl_Window.H>
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#include <FL/Fl_Button.H>
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#include <FL/Fl_Image.H>
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#include <stdio.h>
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#include <stdlib.h>
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int width = 75;
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int height = 75;
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uchar *image;
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void make_image() {
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image = new uchar[3*width*height];
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uchar *p = image;
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for (int y = 0; y < height; y++) {
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double Y = double(y)/(height-1);
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for (int x = 0; x < width; x++) {
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double X = double(x)/(width-1);
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*p++ = uchar(255*((1-X)*(1-Y))); // red in upper-left
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*p++ = uchar(255*((1-X)*Y)); // green in lower-left
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*p++ = uchar(255*(X*Y)); // blue in lower-right
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}
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}
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}
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#include <FL/Fl_Toggle_Button.H>
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Fl_Toggle_Button *leftb,*rightb,*topb,*bottomb,*insideb;
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Fl_Button *b;
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Fl_Window *w;
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void button_cb(Fl_Widget *,void *) {
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int i = 0;
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if (leftb->value()) i |= FL_ALIGN_LEFT;
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if (rightb->value()) i |= FL_ALIGN_RIGHT;
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if (topb->value()) i |= FL_ALIGN_TOP;
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if (bottomb->value()) i |= FL_ALIGN_BOTTOM;
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if (insideb->value()) i |= FL_ALIGN_INSIDE;
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b->align(i);
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w->redraw();
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}
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#include <FL/x.H>
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#include "list_visuals.C"
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int visid = -1;
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int arg(int argc, char **argv, int &i) {
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if (argv[i][1] == 'v') {
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if (i+1 >= argc) return 0;
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visid = atoi(argv[i+1]);
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i += 2;
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return 2;
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}
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return 0;
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}
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int main(int argc, char **argv) {
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#ifndef WIN32
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int i = 1;
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if (Fl::args(argc,argv,i,arg) < argc) {
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fprintf(stderr," -v # : use visual\n%s\n",Fl::help);
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exit(1);
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}
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if (visid >= 0) {
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fl_open_display();
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XVisualInfo templt; int num;
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templt.visualid = visid;
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fl_visual = XGetVisualInfo(fl_display, VisualIDMask, &templt, &num);
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if (!fl_visual) {
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fprintf(stderr, "No visual with id %d, use one of:\n",visid);
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list_visuals();
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exit(1);
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}
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fl_colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
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fl_visual->visual, AllocNone);
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fl_xpixel(FL_BLACK); // make sure black is allocated in overlay visuals
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} else {
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Fl::visual(FL_RGB);
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}
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#endif
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Fl_Window window(400,400); ::w = &window;
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Fl_Button b(140,160,120,120,0); ::b = &b;
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make_image();
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(new Fl_Image(image, width, height))->label(&b);
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leftb = new Fl_Toggle_Button(50,75,50,25,"left");
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leftb->callback(button_cb);
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rightb = new Fl_Toggle_Button(100,75,50,25,"right");
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rightb->callback(button_cb);
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topb = new Fl_Toggle_Button(150,75,50,25,"top");
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topb->callback(button_cb);
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bottomb = new Fl_Toggle_Button(200,75,50,25,"bottom");
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bottomb->callback(button_cb);
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insideb = new Fl_Toggle_Button(250,75,50,25,"inside");
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insideb->callback(button_cb);
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window.resizable(window);
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window.end();
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window.show(argc, argv);
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return Fl::run();
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}
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