129 lines
3.0 KiB
C++
129 lines
3.0 KiB
C++
/* The simple GL demo, modified to draw the GL overlay as well */
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#include <config.h>
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#include <FL/Fl.H>
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#include <FL/Fl_Window.H>
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#include <FL/Fl_Hor_Slider.H>
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#include <FL/Fl_Toggle_Button.H>
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#include <FL/math.h>
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#if !HAVE_GL
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#include <FL/Fl_Box.H>
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class shape_window : public Fl_Box {
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public:
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int sides;
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shape_window(int x,int y,int w,int h,const char *l=0)
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:Fl_Box(FL_DOWN_BOX,x,y,w,h,l){
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label("This demo does\nnot work without GL");
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}
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};
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#else
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#include <FL/gl.h>
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#include <FL/Fl_Gl_Window.H>
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class shape_window : public Fl_Gl_Window {
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void draw();
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void draw_overlay();
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public:
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int sides;
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int overlay_sides;
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shape_window(int x,int y,int w,int h,const char *l=0);
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};
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shape_window::shape_window(int x,int y,int w,int h,const char *l) :
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Fl_Gl_Window(x,y,w,h,l) {
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sides = overlay_sides = 3;
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}
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void shape_window::draw() {
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// the valid() property may be used to avoid reinitializing your
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// GL transformation for each redraw:
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if (!valid()) {
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valid(1);
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glLoadIdentity();
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glViewport(0,0,w(),h());
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}
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// draw an amazing but slow graphic:
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glClear(GL_COLOR_BUFFER_BIT);
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// for (int j=1; j<=1000; j++) {
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glBegin(GL_POLYGON);
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for (int i=0; i<sides; i++) {
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double ang = i*2*M_PI/sides;
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glColor3f(float(i)/sides,float(i)/sides,float(i)/sides);
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glVertex3f(cos(ang),sin(ang),0);
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}
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glEnd();
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// }
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}
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void shape_window::draw_overlay() {
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// the valid() property may be used to avoid reinitializing your
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// GL transformation for each redraw:
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if (!valid()) {
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valid(1);
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glLoadIdentity();
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glViewport(0,0,w(),h());
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}
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// draw an amazing graphic:
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gl_color(FL_RED);
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glBegin(GL_LINE_LOOP);
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for (int i=0; i<overlay_sides; i++) {
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double ang = i*2*M_PI/overlay_sides;
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glVertex3f(cos(ang),sin(ang),0);
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}
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glEnd();
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}
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#endif
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// when you change the data, as in this callback, you must call redraw():
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void sides_cb(Fl_Widget *o, void *p) {
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shape_window *sw = (shape_window *)p;
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sw->sides = int(((Fl_Slider *)o)->value());
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sw->redraw();
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}
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#if HAVE_GL
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void overlay_sides_cb(Fl_Widget *o, void *p) {
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shape_window *sw = (shape_window *)p;
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sw->overlay_sides = int(((Fl_Slider *)o)->value());
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sw->redraw_overlay();
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}
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#endif
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#include <stdio.h>
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int main(int argc, char **argv) {
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Fl_Window window(300, 370);
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shape_window sw(10, 75, window.w()-20, window.h()-90);
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//sw.mode(FL_RGB);
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window.resizable(&sw);
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Fl_Hor_Slider slider(60, 5, window.w()-70, 30, "Sides:");
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slider.align(FL_ALIGN_LEFT);
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slider.callback(sides_cb,&sw);
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slider.value(sw.sides);
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slider.step(1);
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slider.bounds(3,40);
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Fl_Hor_Slider oslider(60, 40, window.w()-70, 30, "Overlay:");
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oslider.align(FL_ALIGN_LEFT);
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#if HAVE_GL
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oslider.callback(overlay_sides_cb,&sw);
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oslider.value(sw.overlay_sides);
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#endif
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oslider.step(1);
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oslider.bounds(3,40);
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window.end();
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window.show(argc,argv);
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#if HAVE_GL
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printf("Can do overlay = %d\n", sw.can_do_overlay());
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sw.show();
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sw.redraw_overlay();
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#else
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sw.show();
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#endif
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return Fl::run();
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}
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