DynaPDF Manual - Page 284

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Function Reference
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LabelDistance is the label for the distance tool, e.g. "mm".
LabelArea is the label for the area tool, e.g. "mm²".
Example (C++):
PPDF* pdf = pdfNewPDF();
if (!pdf) return -1; // Out of memory?
pdfCreateNewPDF(pdf, "e:/cppout.pdf");
// We use top down coordinates in this example
pdfSetPageCoords(pdf, pcTopDown);
pdfAppend(pdf);
// Just a test object of a known size that can be measured...
pdfSetLineWidth(pdf, 0.5);
pdfRectangle(pdf, 50.0, 50.0, 144, 72.0, fmStroke);
TPDFRect bbox;
pdfGetBBox(pdf, pbMediaBox, bbox);
SI32 vp = pdfCreateViewport(
pdf,
// Instance pointer
NULL,
// Optional viewport name
bbox.Left,
// Lowever left corner
bbox.Bottom,
// Lowever left corner
bbox.Right,
// Upper right corner
bbox.Top);
// Upper right corner
pdfCreateRectilinearMeasure(
pdf,
// Instance pointer
vp,
// Viewport handle
25.4/72.0,
// Conversion factor from 1/72 inch to mm
"inch to mm",
// Description of the measure dictionary
"mm",
// Unit label for the distance tool
"mm²");
// Unit label for the area tool
pdfEndPage(pdf);
pdfCloseFile(pdf);
pdfDeletePDF(pdf);
Remarks:
This function is implemented in an Ansi and Unicode compatible variant.
Return values:
If the function succeds the return value is a measure handle, a value greater or equal zero. If the
function fails the return value is a negative error code.
 

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