ID2D1RenderTarget::DrawRectangle(constD2D1_RECT_F*,ID2D1Brush*,FLOAT,ID2D1StrokeStyle*) method (d2d1.h)

Draws the outline of a rectangle that has the specified dimensions and stroke style.

Syntax

void DrawRectangle(
  const D2D1_RECT_F *rect,
  ID2D1Brush        *brush,
  FLOAT             strokeWidth,
  ID2D1StrokeStyle  *strokeStyle
);

Parameters

rect

Type: [in] const D2D1_RECT_F*

The dimensions of the rectangle to draw, in device-independent pixels.

brush

Type: [in] ID2D1Brush*

The brush used to paint the rectangle's stroke.

strokeWidth

Type: [in] FLOAT

The width of the stroke, in device-independent pixels. The value must be greater than or equal to 0.0f. If this parameter isn't specified, it defaults to 1.0f. The stroke is centered on the line.

strokeStyle

Type: [in, optional] ID2D1StrokeStyle*

The style of stroke to paint, or NULL to paint a solid stroke.

Return value

None

Remarks

When this method fails, it does not return an error code. To determine whether a drawing method (such as DrawRectangle) failed, check the result returned by the ID2D1RenderTarget::EndDraw or ID2D1RenderTarget::Flush method.

Examples

The following example uses an ID2D1HwndRenderTarget to draw and fill several rectangles. This example produces the output shown in the following illustration.

// This method discards device-specific
// resources if the Direct3D device disappears during execution and
// recreates the resources the next time it's invoked.
HRESULT DemoApp::OnRender()
{
    HRESULT hr = S_OK;

    hr = CreateDeviceResources();

    if (SUCCEEDED(hr))
    {
        m_pRenderTarget->BeginDraw();

        m_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Identity());

        m_pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));

        D2D1_SIZE_F rtSize = m_pRenderTarget->GetSize();

        // Draw a grid background.
        int width = static_cast<int>(rtSize.width);
        int height = static_cast<int>(rtSize.height);

        for (int x = 0; x < width; x += 10)
        {
            m_pRenderTarget->DrawLine(
                D2D1::Point2F(static_cast<FLOAT>(x), 0.0f),
                D2D1::Point2F(static_cast<FLOAT>(x), rtSize.height),
                m_pLightSlateGrayBrush,
                0.5f
                );
        }

        for (int y = 0; y < height; y += 10)
        {
            m_pRenderTarget->DrawLine(
                D2D1::Point2F(0.0f, static_cast<FLOAT>(y)),
                D2D1::Point2F(rtSize.width, static_cast<FLOAT>(y)),
                m_pLightSlateGrayBrush,
                0.5f
                );
        }

        // Draw two rectangles.
        D2D1_RECT_F rectangle1 = D2D1::RectF(
            rtSize.width/2 - 50.0f,
            rtSize.height/2 - 50.0f,
            rtSize.width/2 + 50.0f,
            rtSize.height/2 + 50.0f
            );

        D2D1_RECT_F rectangle2 = D2D1::RectF(
            rtSize.width/2 - 100.0f,
            rtSize.height/2 - 100.0f,
            rtSize.width/2 + 100.0f,
            rtSize.height/2 + 100.0f
            );


        // Draw a filled rectangle.
        m_pRenderTarget->FillRectangle(&rectangle1, m_pLightSlateGrayBrush);

        // Draw the outline of a rectangle.
        m_pRenderTarget->DrawRectangle(&rectangle2, m_pCornflowerBlueBrush);

        hr = m_pRenderTarget->EndDraw();
    }

    if (hr == D2DERR_RECREATE_TARGET)
    {
        hr = S_OK;
        DiscardDeviceResources();
    }

    return hr;
}

For a related tutorial, see Create a simple Direct2D application.

Requirements

Requirement	Value
Target Platform	Windows
Header	d2d1.h (include D2d1.h)
Library	D2d1.lib
DLL	D2d1.dll

See also

Create a simple Direct2D application

How to Draw and Fill a Basic Shape

ID2D1RenderTarget