MetaFun - Pragma ADE

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8.3 Clipping
In this section we will use the graphic representation (although simplified) of a Dutch cow to
demonstrate clipping.
Figure 8.2 A cow.
Since this cow is defined as a METAPOST graphic, we use the suffix mps instead of eps or a number,
although CONTEXT will recognize each as being METAPOST output. The placement of the cow is
defined as:
\placefigure
{A cow.}
{\externalfigure[cow.mps][width=4cm]}
Clipping is combined with a matrix, as in figure 8.3. The content to be clipped is divided in nx by
ny rectangles. For instance, nx=5 and ny=8 will produce a 40 cell grid with 5 columns of 8 rows.
1,1 3,1
Figure 8.3 A clipped cow.
Here we have divided the cow in six cells, so that we can clip its head and tail. This kind of clipping
enables you to zoom in or focus on a specific part of a graphic.
\setupclipping[nx=3,ny=2]
\startcombination
{\clip[x=1,y=1]{\externalfigure[cow.mps][width=4cm]}} {1,1}
{\clip[x=3,y=1]{\externalfigure[cow.mps][width=4cm]}} {3,1}
\stopcombination
Alternatively, we can specify a width, height, hoffset and voffset, as demonstrated in figure 8.4.
Special effects Clipping