为什么 Graphics::DrawImage 不按预期拉伸图像？

Question

我正在拨打an overloaded TableLayoutPanel which draws some fancy borders，但由于某种原因，对Graphics::DrawImage 的调用没有按预期工作。当我拉伸它时，它似乎淡出了我的 1x10 像素源图像：

这是进行渲染的函数：

void GTableLayoutPanel::RenderSides(Graphics^ g, array<Drawing::Image^>^ sideImages)
{
    if( sideImages )
    {
        if( sideImages->Length < 4 )
        {
            throw gcnew System::ArgumentException(String::Format("Not enough images supplied to render sides (expected 4 but only got {0})", sideImages->Length));
        }

        int borderSize = sideImages[0]->Height;
        g->DrawImage(sideImages[0], Rectangle(borderSize, 0, this->Width-borderSize*2, borderSize));
        g->DrawImage(sideImages[1], Rectangle(this->Width-borderSize, borderSize, borderSize, this->Height-borderSize*2));
        g->DrawImage(sideImages[2], Rectangle(borderSize, this->Height-borderSize, this->Width-borderSize*2, borderSize));
        g->DrawImage(sideImages[3], Rectangle(0, borderSize, borderSize, this->Height-borderSize*2));
    }
}

Answer 1

当您使用极端放大时，这是插值的副作用。你需要这样的东西：

 g->InterpolationMode = System::Drawing::Drawing2D::InterpolationMode::NearestNeighbor;
 g->PixelOffsetMode = System::Drawing::Drawing2D::PixelOffsetMode::None;