GDI+: GdipGetPenDashArray

[José Roca]

The following example creates an array of real numbers and a Pen object, sets the dash pattern, and draws a custom dashed line. The code then gets the dash pattern currently set for the pen.

C++

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VOID Example_GetDashPattern(HDC hdc
{
   Graphics graphics(hdc);

   // Create a custom dashed pen, and use it to draw a line.
   REAL dashVals[4] = {5, 2, 15, 4};
   Pen pen(Color(255, 0, 0, 0), 5);
   pen.SetDashPattern(dashVals, 4);
   graphics.DrawLine(&pen, 5, 20, 405, 200);

   // Obtain information about the pen.
   INT count = 0;
   REAL* dashValues = NULL;

   count = pen.GetDashPatternCount();
   dashValues = new REAL[count];
   pen.GetDashPattern(dashValues, count);

   for(INT j = 0; j < count; ++j)
   {
      // Inspect or use the value in dashValues[j].
   }
   delete [] dashValues;
}


PowerBASIC

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SUB GDIP_GetPenDashArray (BYVAL hdc AS DWORD)

   LOCAL hStatus AS LONG
   LOCAL pGraphics AS DWORD
   LOCAL pPen AS DWORD

   hStatus = GdipCreateFromHDC(hdc, pGraphics)

   ' // Create and set an array of real numbers.
   DIM dashVals(3) AS SINGLE
   ARRAY ASSIGN dashVals() = 5.0!, 2.0!, 15.0!, 4.0!

   ' // Create a Pen object.
   hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 0, 0), 5, %UnitWorld, pPen)

   ' // Set the dash pattern for the custom dashed line.
   hStatus = GdipSetPenDashArray(pPen, dashVals(0), 4)

   ' // Draw the custom dashed line.
   hStatus = GdipDrawLineI(pGraphics, pPen, 5, 20, 405, 200)

   ' // Obtain information about the pen.
   LOCAL count AS LONG
   DIM   dashValues(0) AS SINGLE

   hStatus = GdipGetPenDashCount(pPen, count)
   REDIM dashValues(count - 1)
   hStatus = GdipGetPenDashArray(pPen, dashValues(0), count)

   LOCAL j AS LONG
   FOR j = 0 TO count - 1
      ' // Inspect or use the value in dashValues[j].
      OutputDebugString STR$(dashValues(j))
   NEXT

   ' // Cleanup
   IF pPen THEN GdipDeletePen(pPen)
   IF pGraphics THEN GdipDeleteGraphics(pGraphics)

END SUB