Global Mapper SDK
Draws grid lines (either lat/lon or in the view projection) for the specified location to the provided device context at the given location. If aWorldBounds is not NULL, at least the specified area will be drawn. The aspect ratio of the screen pixels will be maintained, so slightly more of the world bounds than specified may be drawn. If aWorldBounds is NULL, the grid bounds rendered will be that of all loaded layers.
If aMaxGridBounds is specified the grid lines will be allowed to draw anywhere within the value specified. Otherwise, the grid lines will be clamped at the bounds of all loaded data.
Syntax
C++
Copy
GM_Error_t32 GM_DrawGridLinesEx
(
HDC aDC, // Device context to draw to
boolean aLatLonGrid, // Draw a lat/lon grid or a view projection grid
double aGridSpacing, // Grid spacing (use 0.0 for default)
const GM_Rectangle_t* aWorldBounds, // World bounds to draw or NULL for all
sint32 aLeftPixel, // Left pixel coordinate to draw to
sint32 aTopPixel, // Top pixel coordinate to draw to
sint32 aPixelWidth, // Width in pixels to draw
sint32 aPixelHeight, // Height in pixels to draw
const GM_Rectangle_t* aMaxGridBounds // Maximum grid bounds (NULL for loaded data bounds)
);