add a simple example how to use rfbDoCopyRect

examples/Makefile.am

 CFLAGS=-I.. -g -Wall
+LDADD = ../libvncserver.a
 
 if HAVE_LIBPTHREAD
 BACKGROUND_TEST=blooptest
@@ -9,10 +10,12 @@ MAC=mac
 mac_LDFLAGS=-framework ApplicationServices -framework Carbon -framework IOKit
 endif
 
+copyrecttest_LDADD=$(LDADD) -lm
+
 noinst_HEADERS=radon.h
 
 noinst_PROGRAMS=example pnmshow regiontest pnmshow24 fontsel \
-	vncev storepasswd colourmaptest simple simple15 $(BACKGROUND_TEST) $(MAC)
+	vncev storepasswd colourmaptest simple simple15 copyrecttest \
+	$(BACKGROUND_TEST) $(MAC)
 
-LDADD = ../libvncserver.a
 

examples/copyrecttest.c

+#include <rfb/rfb.h>
+#include <math.h>
+
+void initBackground(rfbScreenInfoPtr server)
+{
+  unsigned int i,j;
+
+  for(i=0;i<server->width;i++)
+    for(j=0;j<server->height;j++) {
+      server->frameBuffer[(j*server->width+i)*4+0]=i&0xff;
+      server->frameBuffer[(j*server->width+i)*4+1]=j&0xff;
+      server->frameBuffer[(j*server->width+i)*4+2]=(i*j)&0xff;
+    }
+}
+
+int main(int argc,char** argv)
+{             
+  int width=400,height=300,w=20,x,y;
+  double r,phi;
+  
+  rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,width,height,8,3,4);
+  server->frameBuffer=malloc(width*height*4);
+  initBackground(server);
+  server->rfbDeferUpdateTime=0;
+  rfbInitServer(server);
+
+  r=0;
+  while(1) {
+    if(r<=0) {
+      initBackground(server);
+      rfbMarkRectAsModified(server,0,0,width,height);
+      r=0.43;
+      phi=0;
+    } else {
+      r-=0.0001;
+      phi+=0.02;
+      if(phi>2*M_PI)
+	phi-=2*M_PI;
+    }
+    x=width*(0.5+cos(phi)*r);
+    y=height*(0.5+sin(phi)*r);
+    if(x>=0 && y>=0 && x+w<=width && y+w<=height) {
+      unsigned int dx=width*0.5*(1-cos(phi)*r)-x,
+      		dy=height*0.5*(1-sin(phi)*r)-y;
+      rfbDoCopyRect(server,x,y,x+w,y+w,-dx,-dy);
+    }
+    rfbProcessEvents(server,50000);
+  }
+  return(0);
+}