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#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
#include <tgmath.h>
#define MAXPX 360
#ifndef M_PI
M_PI=3.1415
#endif
struct pixels {
float x ;
float y ;
} ;
unsigned int pixel_idx=0 ;
struct pixels get_coords(int position,int scale,float radius,int center_x, int center_y) {
struct pixels res_px ;
int offset=-90 ;
float degrees=360/scale*position+offset ;
float rad=degrees/180.0*M_PI ;
float xpos=cos(rad) * radius + center_x ;
float ypos=sin(rad) * radius + center_y ;
res_px.x=xpos ;
res_px.y=ypos ;
return res_px ;
}
int main() {
Display *display ;
Window root_win, win ;
GC clock_pointer_gc,clock_circle_gc ;
XGCValues clock_circle_values, clock_pointer_values ;
int screen_num,width=450,height=450 ;
unsigned long background, clock_circle ;
display=XOpenDisplay(NULL) ; //set root display
root_win=RootWindow(display,0) ; // set root window
screen_num=DefaultScreen(display) ; // get the root screen number
/* start of settings for color getting */
Colormap cmap ;
XColor xc, xc1 ;
cmap=DefaultColormap(display,screen_num) ;
XAllocNamedColor(display,cmap,"Red",&xc,&xc1) ; // getting the Red color
background=xc.pixel ; //color for background
XAllocNamedColor(display,cmap,"White",&xc,&xc1) ; // getting the white color
clock_circle=xc.pixel ; // color for clock circle
/* settings for the clock pointer */
clock_pointer_values.foreground=BlackPixel(display,screen_num) ;
clock_pointer_values.line_width=10 ;
clock_pointer_values.line_style=LineSolid ;
clock_pointer_values.cap_style=CapRound ; /* CapNotLast, CapButt,CapRound, CapProjecting */
/* settings for the clock circle */
clock_circle_values.foreground=clock_circle ;
clock_circle_values.line_width=1 ;
clock_circle_values.line_style=LineSolid ;
clock_circle_values.cap_style=CapRound ; /* CapNotLast, CapButt,CapRound, CapProjecting */
clock_circle_values.join_style= JoinRound ; /* JoinMiter, JoinRound, JoinBevel */
win=XCreateSimpleWindow(display,root_win,
0,0, //x,y
width,height, //width height
0,0, // borderwidth && bordercolor
background // background color
) ;
clock_pointer_gc=XCreateGC(display,win,GCForeground | GCLineWidth | GCLineStyle| GCCapStyle | GCJoinStyle,&clock_circle_values) ;
clock_circle_gc=XCreateGC(display,win,GCForeground| GCLineWidth | GCLineStyle| GCCapStyle ,&clock_pointer_values) ;
XSelectInput(display,win,ButtonPressMask | KeyPressMask | ExposureMask | StructureNotifyMask ) ;
XMapWindow(display,win) ; // start the display
struct pixels tmp_px1 ;
struct pixels tmp_px2 ;
float center_x=450/2 ;
float center_y=450/2 ;
XPoint clock_circle_px[360] ;
int clock_pointer_pos=0 ;
for (;;) {
XEvent event ;
XNextEvent(display,&event) ;
switch(event.type) {
case Expose :
;
case ConfigureNotify :
if (event.xconfigure.width != 450 || event.xconfigure.height != 450) {
width=event.xconfigure.width ;
height=event.xconfigure.height ;
XClearWindow(display,event.xany.window) ;
printf("size changed to width: %i ancd height: %i\n",width,height) ;
}
break ;
case ButtonPress :
XClearWindow(display,event.xany.window) ;
int c ;
for ( c=0 ; c < 360 ; c++) {
tmp_px1=get_coords(c,360,200,450/2,450/2) ;
clock_circle_px[c].x=tmp_px1.x ;
clock_circle_px[c].y=tmp_px1.y ;
}
XFillPolygon(display, win, clock_pointer_gc, clock_circle_px, 360, 0, 0) ;
tmp_px2=get_coords(clock_pointer_pos,60,150,450/2,450/2) ;
clock_pointer_pos++ ;
XDrawLine(display, win, clock_circle_gc,center_x,center_y,tmp_px2.x,tmp_px2.y) ;
break ;
case KeyPress :
printf("keycode %i == %c\n",(int) event.xkey.keycode,event.xkey.keycode) ;
XCloseDisplay(display) ;
return 0 ;
}
}
} |
