3.1.5 Zooming

These variables and functions control the overall zooming of the picture (see Zoom()) or the sub-picture (see PlotFactor). Normally you can use these variables and functions for removing “white” spaces around a plot.

Method on mglGraph (C++, Python): void SetPlotFactor (float val)

C function: void mgl_set_plotfactor (HMGL gr, float val)

Sets the factor of plot size. It is not recommended to set it lower then 1.5. This is some analogue of function Zoom() but applied not to overall image but for each InPlot. Use negative value or zero to enable automatic PlotFactor selection.

Method on mglGraph (C++, Python): void Zoom (float x1, float y1, float x2, float y2)

C function: void mgl_set_zoom (HMGL gr, float x1, float y1, float x2, float y2)

The function changes the scale of graphics that correspond to zoom in/out of the picture. After function call the current plot will be cleared and further the picture will contain plotting from its part [x1,x2]*[y1,y2]. Here picture coordinates x1, x2, y1, y2 changes from 0 to 1. Attention! this settings can not be overwritten by any other functions. Use Zoom(0,0,1,1) to return default view.

Obsolete option of mglGraph: float PlotFactor

The factor of plot size. See SetPlotFactor().

Obsolete option of mglGraph: bool AutoPlotFactor

Switch on/off automatic change of PlotFactor variable during plot rotation. See SetPlotFactor().