draw_wind.c

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#include "prototypes.h"
 
void draw_wind(Pixmap pix,int r,int s,double data)
 
{
 
extern GC gc;
extern Display *display;
extern unsigned long qmap[16];
int i,x[3],y[3],dir,speed,gust,x0,y0;
int nul,mul,staff,barb;
double angle,rad;
char kbuf[10];
 
dir=data/1000000;
speed=(data - dir*1000000)/1000;
gust=(data - dir*1000000 - speed*1000);
 
x[0]=r;     
y[0]=s;
rad=.0174533;
 
XSetForeground(display,gc,qmap[15]);
 
if(speed==0) {
 
              x0=x[0];
              y0=y[0]-1;
              XDrawLine(display,pix,gc,x0+2,y0+2,x0+2,y0-2);
              XDrawLine(display,pix,gc,x0+2,y0+2,x0-2,y0+2);
              XDrawLine(display,pix,gc,x0-2,y0-2,x0+2,y0-2);
              XDrawLine(display,pix,gc,x0-2,y0-2,x0-2,y0+2);
 
              }
      
speed=speed+2;
staff=25;
staff=staff + (speed/50) * 10;
barb=10;
 
angle=(double)(90-(dir));
 
x[1]= (double)staff*cos(angle*rad) +x[0];
y[1]=-(double)staff*sin(angle*rad) +y[0];
 
XDrawLine(display,pix,gc,x[0],y[0],x[1],y[1]);
 
if(gust > 0 ) {
 
                 sprintf(kbuf,"%d",gust);
 
                 XDrawString(display,pix,gc,x[0]+4,y[0]+4,kbuf,strlen(kbuf));
 
                                              }
 
mul=speed/50;
 
for(i=0;i<mul;i++) {
 
               x[2]= (double)barb*cos((angle-90)*rad) +x[1];
               y[2]=-(double)barb*sin((angle-90)*rad) +y[1];
               XDrawLine(display,pix,gc,x[1],y[1],x[2],y[2]);
 
               staff=staff-10;
 
               x[1]= (double)staff*cos(angle*rad) + x[0];
               y[1]=-(double)staff*sin(angle*rad) + y[0];
               XDrawLine(display,pix,gc,x[1],y[1],x[2],y[2]);
 
                   } 
 
nul=speed-mul*50;
 
nul=nul/10;
 
for(i=0;i<nul;i++) {
 
               x[1]= (double)staff*cos(angle*rad) + x[0];
               y[1]=-(double)staff*sin(angle*rad) + y[0];
 
               x[2]= (double)barb*cos((angle-90)*rad) +x[1];
               y[2]=-(double)barb*sin((angle-90)*rad) +y[1];
 
               XDrawLine(display,pix,gc,x[1],y[1],x[2],y[2]);
  
               staff=staff-5;
 
                  } 
 
mul=speed- mul*50 - nul*10;
 
if(mul >= 5) {
 
               if(speed < 10)
                            staff=staff-5;
 
               x[1]= (double)staff*cos(angle*rad) + x[0];
               y[1]=-(double)staff*sin(angle*rad) + y[0];
 
               x[2]= (double)barb/2*cos((angle-90)*rad) +x[1];
               y[2]=-(double)barb/2*sin((angle-90)*rad) +y[1];
               XDrawLine(display,pix,gc,x[1],y[1],x[2],y[2]);
 
                   } 
 
}