how to use WinProp_WriteBitmapLegend in winprop API？

Hi,

this can be done as shown in the example on page 199 of the WinProp API reference guide:

WinProp_Legend Legend;
// init
WinProp_Structure_Init_Legend(&Legend);

Then WinProp_Legend_Allocate needs to be called with the NrSamplingPoints equal to the number of thresholds to be used in the legende. And before the program end then WinProp_Legend_Free.

The legende can then be configured using the following code:

int WinProp_Legend_Configure(
    WinProp_Legend      *Legend,
    double              MinValue,
    double              MaxValue
)
{
    int Sample, Position;
    double Value, Step;
    int Palette[LEGEND_PALETTE_MAXIMUM_REGULAR];

    /* Setting the Parameter. */
    Value = MinValue;
    Step = (MaxValue - MinValue) / (double)(Legend->NrSamplingPoints-1);

    /* Definition of the rainbow palette */
    WinProp_Rainbow_Fill(Palette, LEGEND_PALETTE_MAXIMUM_REGULAR);

    for (Sample=0; Sample<Legend->NrSamplingPoints; Sample++)
    {
        /* Assign actual level */
        Legend->SamplingPoints[Sample].Value = Value;

        /* Assign actual color */
        Position = (int)((Value - MinValue) / (MaxValue - MinValue) * (double)LEGEND_PALETTE_MAXIMUM_REGULAR);
        Legend->SamplingPoints[Sample].Color = Palette[Position];

        /* Next threshold */
        Value += Step;
    }

    return(0);
}

with

int WinProp_Rainbow_Fill(
    int                 *Colors,
    int                 Number
)
{
    int Loop, Position = 0;
    unsigned char Red, Green, Blue;

    /* To generate the rainbow the following */
    /* color sequence must be set            */
    /*
    1.red = 255 ; green = 0 -> 255 ; blue = 0
    2.red = 255 -> 0 ; green = 255 ; blue = 0
    3.red = 0 ; green = 255 ; blue = 0 -> 255
    4.red = 0 ; green = 255 -> 0 ; blue = 255
    5.red = 0 -> 255 ; green = 0 ; blue = 255
    6.red = 255 ; green = 0 ; blue = 255 -> 0
    */

    /* Step 1 */
    for (Loop=0; Loop<256; Loop++)
    {
        Red = 255;
        Green = Loop;
        Blue = 0;

        Colors[Number - Position - 1] = RGB(Red, Green, Blue);
        Position++;
    }

    /* Step 2 */
    for (Loop=0; Loop<256; Loop++)
    {
        Red = 255 - Loop;
        Green = 255;
        Blue = 0;

        Colors[Number - Position - 1] = RGB(Red, Green, Blue);
        Position++;
    }

    /* Step 3 */
    for (Loop=0; Loop<256; Loop++)
    {
        Red = 0;
        Green = 255;
        Blue = Loop;

        Colors[Number - Position - 1] = RGB(Red, Green, Blue);
        Position++;
    }

    /* Step 4 */
    for (Loop=0; Loop<256; Loop++)
    {
        Red = 0;
        Green = 255 - Loop;
        Blue = Loop;

        Colors[Number - Position - 1] = RGB(Red, Green, Blue);
        Position++;
    }

    /* Step 5 */
    for (Loop=0; Loop<256; Loop++)
    {
        Red = Loop;
        Green = 0;
        Blue = 255;

        Colors[Number - Position - 1] = RGB(Red, Green, Blue);
        Position++;
    }

    /* Step 6 */
    for (Loop=0; Loop<256; Loop++)
    {
        Red = 255;
        Green = 0;
        Blue = 255 - Loop;

        Colors[Number - Position - 1] = RGB(Red, Green, Blue);
        Position++;
    }

    return(0);
}