class Grid for Operation Flashpoint

// Do we want numeric grid?
#define NUM_GRID



// Set options based on which grid was selected
#ifdef NUM_GRID

    #define GRID_ZOOMMAX2  1.00000001504746624E30

    // Property formatX in the first class has one zero more than in the second class
    #define GRID_FORMAT_X2 00
    #define GRID_FORMAT_X1 GRID_FORMAT_X2##0

    // These properties don't change so just copy from previous
    #define GRID_FORMAT_Y1 GRID_FORMAT_X1
    #define GRID_FORMAT_Y2 GRID_FORMAT_X2

    #define GRID_STEP      100

    // This is a multiplier, -1 will result in a negative number
    #define GRID_STEP_Y    -1

#else

    #define GRID_ZOOMMAX2  1.00000001504747E+30

    // Property formatX in the first class has one letter more than in the second class
    #define GRID_FORMAT_X2 A
    #define GRID_FORMAT_X1 GRID_FORMAT_X2##a

    // Property formatY in the first class has one zero more than in the second class
    #define GRID_FORMAT_Y2 0
    #define GRID_FORMAT_Y1 GRID_FORMAT_Y2##0

    #define GRID_STEP      128

    // This is a multiplier, 1 means no change
    #define GRID_STEP_Y    1

#endif





class Grid
{
    offsetX = 0;
    offsetY =
    #ifdef NUM_GRID 12800
    #else           0
    #endif          ;


    // Zoom classes are similar so create a function-like macro
    #define GRID_ZOOM(NUM, ZOOMMAX, FORMATX, FORMATY, STEP, STEP_Y, MULTIPLIER) \
        class Zoom##NUM { \
            zoomMax = ZOOMMAX; \
            format  = "XY"; \
            formatX = #FORMATX; \
            formatY = #FORMATY; \
            stepX   = __EVAL(STEP * MULTIPLIER); \
            stepY   = __EVAL(STEP * MULTIPLIER * STEP_Y); \
        };

    // NUM                - class name appendix
    // #FORMATX, #FORMATY - will wrap macro in quotation marks
    // __EVAL()           - calculates formula
    // STEP_Y, MULTIPLIER - multipliers, in the second class the value needs to be larger


    // Now call this function and pass to it options defined on the beginning
    GRID_ZOOM(1, 0.2           ,GRID_FORMAT_X1,GRID_FORMAT_Y1, GRID_STEP, GRID_STEP_Y, 1)
    GRID_ZOOM(2, GRID_ZOOMMAX2 ,GRID_FORMAT_X2,GRID_FORMAT_Y2, GRID_STEP, GRID_STEP_Y, 10)

    // This will create classes Zoom1 and Zoom2
    // Be careful with whitespaces as they are not ignored in the function-like macros
};








/*
After preprocessing with NUM_GRID macro
Cleaned for readability

class Grid
{
    offsetX = 0;
    offsetY =  12800;
    class Zoom1 {
        zoomMax =  0.2;
        format  = "XY";
        formatX = "000";
        formatY = "000";
        stepX   = __EVAL( 100 *  1);
        stepY   = __EVAL( 100 *  1 *  -1);
    };
    class Zoom2 {
        zoomMax = 1.00000001504746624E30;
        format  = "XY";
        formatX = "00";
        formatY = "00";
        stepX   = __EVAL( 100 *  10);
        stepY   = __EVAL( 100 *  10 *  -1);
    };
};

After preprocessing without NUM_GRID macro
Cleaned for readability

class Grid
{
    offsetX = 0;
    offsetY = 0;
    class Zoom1 {
        zoomMax = 0.2;
        format  = "XY";
        formatX = "Aa";
        formatY = "00";
        stepX   = __EVAL( 128 *  1);
        stepY   = __EVAL( 128 *  1 *  1);
    };
    class Zoom2 {
        zoomMax =  1.00000001504747E+30;
        format  = "XY";
        formatX = "A";
        formatY = "0";
        stepX   = __EVAL( 128 *  10);
        stepY   = __EVAL( 128 *  10 *  1);
    };
};
*/