GM_CalcScaleRectangle

Marius Lazar

September 02, 2026 13:40 Updated

Global Mapper SDK

Calculates the rectangle in global coordinates required to draw at the provided scale to the given device of the given size.

Syntax

C++

Copy

GM_Error_t32 GM_CalcScaleRectangle
(
const GM_Point_t*       aCenterPoint,   // IN: Center point in global coordinates
double                  aScale,         // IN: Scale to calculate at (i.e. for 1:24K, pass 24000.0)
HDC                     aDC,            // IN: Device context that will be drawn to
sint32                  aPixWidth,      // IN: pixel width
sint32                  aPixHeight,     // IN: pixel height
GM_Rectangle_t*         aScaleRect      // OUT: rectangle at given scale
);