InkRenderer.Draw Method (Windows)

InkRenderer.Draw Method

InkRenderer.Draw Method

Draws ink strokes using the known device context.

Syntax

C++


HRESULT Draw(
  [in]  long hdc,
  [in]  IInkStrokes *strokes
);

Parameters

hdc [in]: Specifies the hWnd of the device context on which to draw.
strokes [in]: Specifies the strokes to draw.

Return Value

The method can return one of the following values.

Return code	Description
S_OK	Success.
E_POINTER	A parameter contained an invalid pointer.
E_INK_MISMATCHED_INK_OBJECT	The strokes parameter is associated with a different InkDisp object.
E_INVALIDARG	An argument is invalid.
E_INK_INCOMPATIBLE_OBJECT	The hdc or the strokes parameter does not point to a valid object.
E_INK_EXCEPTION	An exception occurred inside the method.
E_UNEXPECTED	Unexpected parameter or property type.

Remarks

The pen width is multiplied (or scaled) by the square root of the determinant of the view transform.

Note If you have not set the pen width explicitly, it is 53 by default. You must multiply the pen width by the square root of the determinant to yield the correct bounding box. The height and width of the bounding box are expanded by half this amount in each direction.

For example, consider that the pen width is 53, the square root of the determinant is 50, and the bounding box is (0,0,1000,1000). The pen width adjustment to the bounding box in each direction is calculated as (53*50)/2, and the right and bottom sides are incremented by one. This results in a rendered bounding box of (-1325,-1325,2326,2326).

Note Use the DrawStroke method to draw a single stroke.

The InkRenderer forces the viewport and window origins to 0, 0. Any existing settings are saved and restored, but is not used by the InkRenderer. To perform scrolling, use the InkRenderer object's view and object transform methods.

Applies To

InkRenderer

Requirements