linkpoly.c

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

    if (buffer == NULL)
      return -1; /* Memory allocation error */

    buffercount=0;
    
    buffercount += BufferedWriteLinkPolyHeader(&buffer[buffercount]);
    buffercount += BufferedWriteInteger(&buffer[buffercount], RENDERTYPE_LATLON);
    buffercount += BufferedWriteInteger(&buffer[buffercount], ltype);
    buffercount += BufferedWriteInteger(&buffer[buffercount], numberOflatlon);

    for(i=0;i < numberOflatlon; i++)
    {
        buffercount += BufferedWriteFloat(&buffer[buffercount], (float)latlon[i]);
    }
    
    buffercount += BufferedWriteInteger(&buffer[buffercount], unit);
    buffercount += BufferedWriteInteger(&buffer[buffercount], nsegs);
    buffercount += BufferedWriteLinkArgs(&buffer[buffercount], linkArgs);

    retval = WriteChars(linkSocket, buffer,buffercount);         
    free(buffer);
    return retval;
}

int BufferedWriteLinkPolyLatLon2(LinkSocket *linkSocket, int ltype, 
                                 int numberOflatlon, /*size of lat or lon array*/
                                 double lat[], double lon[], /*These 2 arrays are of equal size*/
                                 int unit, int nsegs, 
                                 LinkArgs *linkArgs)
{
    int i;
    
    int buffercount;
    char *buffer;
    int retval;
    /*
      buffercount corresponds to data being written in bytes below.
    */
    buffercount = lPOLY_HEADER +  /* Bytes used by Header*/
        N_BYTES_PER_INTEGER +     /*Bytes used by GRAPHIC_TYPE. It is an Integer*/
        N_BYTES_PER_INTEGER +     /*Bytes used by RENDERTYPE identifier*/               
        4*N_BYTES_PER_INTEGER +   /*Bytes used by numberOflatlon, unit, nsegs,ltype*/
        N_BYTES_PER_FLOAT*numberOflatlon +
        LinkSizeOfLinkArgs(linkArgs);
    
    buffer = (char *)malloc(buffercount);
    if (buffer == NULL)
      return -1; /* Memory allocation error */

    buffercount=0;
    
    buffercount += BufferedWriteLinkPolyHeader(&buffer[buffercount]);
    buffercount += BufferedWriteInteger(&buffer[buffercount], RENDERTYPE_LATLON);
    buffercount += BufferedWriteInteger(&buffer[buffercount], ltype);
    buffercount += BufferedWriteInteger(&buffer[buffercount],
                                        numberOflatlon + numberOflatlon);
    
    for(i=0;i < numberOflatlon; i++)
    {
        buffercount += BufferedWriteFloat(&buffer[buffercount], (float)lat[i]);
        buffercount += BufferedWriteFloat(&buffer[buffercount], (float)lon[i]);
    }
    
    buffercount += BufferedWriteInteger(&buffer[buffercount], unit);
    buffercount += BufferedWriteInteger(&buffer[buffercount], nsegs);
    buffercount += BufferedWriteLinkArgs(&buffer[buffercount], linkArgs);
    
    retval = WriteChars(linkSocket, buffer,buffercount);         
    free(buffer);
    return retval;
}

int BufferedWriteLinkPolyXY(LinkSocket *linkSocket,                      
                            int numberOfXY, int XY[],                   
                            LinkArgs *linkArgs)
{
    
    int buffercount;
    char *buffer;
    int retval,i;
    /*
      buffercount corresponds to data being written in bytes below.
    */
    buffercount = lPOLY_HEADER +  /* Bytes used by Header*/
        N_BYTES_PER_INTEGER +     /*Bytes used by GRAPHIC_TYPE. It is an Integer*/
        N_BYTES_PER_INTEGER +     /*Bytes used by RENDERTYPE identifier*/
        N_BYTES_PER_INTEGER +    /*byts used by numberOfXY*/
        2*N_BYTES_PER_INTEGER +   /*Bytes used by numberofxy and coordmode*/
        numberOfXY*N_BYTES_PER_INTEGER + /*bytes used by xy points*/
        LinkSizeOfLinkArgs(linkArgs);
    
    buffer = (char *)malloc(buffercount);
    if (buffer == NULL)
      return -1; /* Memory allocation error */

    buffercount=0;
    
    buffercount += BufferedWriteLinkPolyHeader(&buffer[buffercount]);
    buffercount += BufferedWriteInteger(&buffer[buffercount], RENDERTYPE_XY);
    
    buffercount += BufferedWriteInteger(&buffer[buffercount], numberOfXY);
    for(i=0;i < numberOfXY; i++)
    {
        buffercount += BufferedWriteInteger(&buffer[buffercount], XY[i]);
    }
    
    buffercount += BufferedWriteLinkArgs(&buffer[buffercount], linkArgs);
    
    retval = WriteChars(linkSocket, buffer,buffercount);         
    free(buffer);
    return retval;
}

int BufferedWriteLinkPolyXY2(LinkSocket *linkSocket,  
                             int numberOfXY, /*count of elements in X or Y array*/
                             int X[], int Y[], /* These 2 arrays are of equal size*/
                             LinkArgs *linkArgs)
{
    int buffercount;
    char *buffer;
    int retval,i;
    /*
      buffercount corresponds to data being written in bytes below.
    */
    buffercount = lPOLY_HEADER +  /* Bytes used by Header*/
        N_BYTES_PER_INTEGER +     /*Bytes used by GRAPHIC_TYPE. It is an Integer*/
        N_BYTES_PER_INTEGER +     /*Bytes used by RENDERTYPE identifier*/
        N_BYTES_PER_INTEGER +    /*byts used by numberOfXY*/
        2*N_BYTES_PER_INTEGER +   /*Bytes used by numberofxy and coordmode*/
        numberOfXY*N_BYTES_PER_INTEGER + /*bytes used by xy points*/
        LinkSizeOfLinkArgs(linkArgs);
    
    buffer = (char *)malloc(buffercount);
    if (buffer == NULL)
      return -1; /* Memory allocation error */

    buffercount=0;
    
    buffercount += BufferedWriteLinkPolyHeader(&buffer[buffercount]);
    buffercount += BufferedWriteInteger(&buffer[buffercount], RENDERTYPE_XY);
    buffercount += BufferedWriteInteger(&buffer[buffercount], numberOfXY + numberOfXY);

    for(i=0;i < numberOfXY; i++)
    {
        buffercount += BufferedWriteInteger(&buffer[buffercount], X[i]);
        buffercount += BufferedWriteInteger(&buffer[buffercount], Y[i]);
    }
    
    buffercount += BufferedWriteLinkArgs(&buffer[buffercount], linkArgs);
    
    retval = WriteChars(linkSocket, buffer,buffercount);         
    free(buffer);
    return retval;
}

int BufferedWriteLinkPolyOffset(LinkSocket *linkSocket,
                                double lat, double lon,
                                int numberOfXY, int XY[], int CoordMode,
                                LinkArgs *linkArgs)
{

    int buffercount;
    char *buffer;
    int retval,i;
    /*
      buffercount corresponds to data being written in bytes below.
    */
    buffercount = lPOLY_HEADER +  /* Bytes used by Header*/
        N_BYTES_PER_INTEGER +     /*Bytes used by GRAPHIC_TYPE. It is an Integer*/
        N_BYTES_PER_INTEGER +     /*Bytes used by RENDERTYPE identifier*/
        2*N_BYTES_PER_FLOAT +     /*Bytes used by lat and lon*/
        2*N_BYTES_PER_INTEGER +   /*Bytes used by numberofxy and coordmode*/
        numberOfXY*N_BYTES_PER_INTEGER + /*bytes used by xy points*/
        LinkSizeOfLinkArgs(linkArgs);
    
    buffer = (char *)malloc(buffercount);
    if (buffer == NULL)
      return -1; /* Memory allocation error */

    buffercount=0;
    
    buffercount += BufferedWriteLinkPolyHeader(&buffer[buffercount]);
    buffercount += BufferedWriteInteger(&buffer[buffercount], RENDERTYPE_OFFSET);
    buffercount += BufferedWriteFloat(&buffer[buffercount], lat);
    buffercount += BufferedWriteFloat(&buffer[buffercount], lon);
    buffercount += BufferedWriteInteger(&buffer[buffercount], numberOfXY);
    
    for(i=0;i < numberOfXY; i++)
    {
        buffercount += BufferedWriteInteger(&buffer[buffercount], XY[i]);
    }
    
    buffercount += BufferedWriteInteger(&buffer[buffercount], CoordMode);
    buffercount += BufferedWriteLinkArgs(&buffer[buffercount], linkArgs);
    
    retval = WriteChars(linkSocket, buffer,buffercount);         
    free(buffer);
    return retval;
}

int BufferedWriteLinkPolyOffset2(LinkSocket *linkSocket,
                                 double lat, double lon,
                                 int numberOfXY, /*count of elements in X or Y array*/
                                 int X[], int Y[],
                                 int CoordMode,                 
                                 LinkArgs *linkArgs)
{
    int buffercount;
    char *buffer;
    int retval,i;
    /*
      buffercount corresponds to data being written in bytes below.
    */
    buffercount = lPOLY_HEADER +  /* Bytes used by Header*/
        N_BYTES_PER_INTEGER +     /*Bytes used by GRAPHIC_TYPE. It is an Integer*/
        N_BYTES_PER_INTEGER +     /*Bytes used by RENDERTYPE identifier*/
        2*N_BYTES_PER_FLOAT +     /*Bytes used by lat and lon*/
        2*N_BYTES_PER_INTEGER +   /*Bytes used by numberofxy and coordmode*/
        numberOfXY*N_BYTES_PER_INTEGER + /*bytes used by xy points*/
        LinkSizeOfLinkArgs(linkArgs);
    
    buffer = (char *)malloc(buffercount);
    if (buffer == NULL)
      return -1; /* Memory allocation error */

    buffercount=0;
    
    buffercount += BufferedWriteLinkPolyHeader(&buffer[buffercount]);
    buffercount += BufferedWriteInteger(&buffer[buffercount], RENDERTYPE_OFFSET);
    buffercount += BufferedWriteFloat(&buffer[buffercount], lat);
    buffercount += BufferedWriteFloat(&buffer[buffercount], lon);
    buffercount += BufferedWriteInteger(&buffer[buffercount], numberOfXY + numberOfXY);
    
    for(i=0;i < numberOfXY; i++)
    {
        buffercount += BufferedWriteInteger(&buffer[buffercount], X[i]);
        buffercount += BufferedWriteInteger(&buffer[buffercount], Y[i]);
    }
    
    buffercount += BufferedWriteInteger(&buffer[buffercount], CoordMode);
    buffercount += BufferedWriteLinkArgs(&buffer[buffercount], linkArgs);
    
    retval = WriteChars(linkSocket, buffer,buffercount);         
    free(buffer);
    return retval;
}