IInkRenderer::Measure
4/8/2010
Calculates the rectangle on the device context that would contain a collection of strokes if the strokes were drawn with the IInkRenderer object using the IInkRenderer::DrawStroke method.
Syntax
HRESULT Measure (
[in] IInkStrokes *strokes,
[out, retval] IInkRectangle **Rectangle
);
Parameters
- strokes
The collection of strokes to measure.
- Rectangle
Returns the rectangle on the device context that would contain the strokes if they were drawn with the DrawStroke method of the IInkRenderer object. The strokes must contain x– and y–coordinates to calculate the rectangle. Otherwise, the method returns an empty rectangle.
Return Value
| HRESULT value | Description |
|---|---|
S_OK |
Success. |
E_POINTER |
A parameter contained an invalid pointer. |
E_INVALIDARG |
Invalid display handle. |
E_INK_INCOMPATIBLE_OBJECT |
The strokes parameter does not point to a valid object. |
E_INK_MISMATCHED_INK_OBJECT |
The strokes parameter is associated with a different IInkDisp object. |
E_INK_EXCEPTION |
An exception occurred inside the method. |
E_UNEXPECTED |
Unexpected parameter or property type. |
Remarks
This is accurate only if you pass the same arguments to both Measure and DrawStroke.
Since the bounding box is affected by the pen width, this width is scaled appropriately for the IInkRenderer's view transform. To do this, the pen width is multiplied by the square root of the determinant of the view transform. The height and width of the bounding box are expanded by half this amount in each direction, and the right and bottom sides are incremented by one.
For example, consider that the pen width is originally 53, the square root of the determinant of the view transform 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).
Requirements
| Header | msinkaut.h |
| Windows Embedded CE | Windows CE 5.0 and later |
| Windows Mobile | Windows Mobile 6 Classic and later, Windows Mobile 6 Professional and later |