I've embedded a GLControl in to a WindowsFormsHost for a WPF application, as described by http://www.jfmajor.com/post/38447851593/monogame-in-wpf , but there's a strange dead area at the top of the control - like the origin has been offset slightly :
I've checked the margins and padding of both the controls I'm using, so it's not that (probably wouldn't be since the back buffer gets properly cleared), but I can't find anything obvious.
I've noticed that the presentation parameters and display mode settings both have their resolution set to my screen's resolution, so I'm guessing they're not really used by the GL device. I also update the viewport of the device to the size of the GLControl whenever a resize event occurs.
I'm rendering the lines using a scaled 1x1 texture, setting the origin of the sprite batch draw call to (0,0):
// aStartPoint = (0.0f, 0.0f) // anEndPoint = (500.0f, 100.0f) float angle = (float)Math.Atan2( anEndPoint.Y - aStartPoint.Y, anEndPoint.X - aStartPoint.X ); float length = ( anEndPoint - aStartPoint ).Length(); aColour.A = myOpacity; aSpriteBatch.Draw( myLineTexture, // Texture aStartPoint, // Start point of the line null, // Rectangle (not needed) aColour, // Colour of the line angle, // Angle between the start and end point Vector2.Zero, // Origin new Vector2(length, 1), // Scale SpriteEffects.None, // No effects needed 0); // Might want to modify this later, the layer is essential the z coordinate
This is the xaml I'm using to set up the window, when I create the GLControl I set it as the child of the WindowsFormsHost :
<Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <WindowsFormsHost x:Name="myEngineViewHost" Grid.Column="1" Grid.Row="1" Width="500" Height="500" Margin="0" Padding="0" /> <TabControl Grid.Column="0" Grid.Row="1" Height="Auto" Name="myTabControl" Width="Auto"> <TabItem Header="Objects" Name="myObjectsTab"> <Grid /> </TabItem> <TabItem Header="Templates" Name="myTemplatesTab"> <Grid /> </TabItem> <TabItem Header="Layers" Name="myLayersTab"> <Grid /> </TabItem> </TabControl> <Menu Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="0" Height="20" Name="myMainMenu" Width="Auto" > <MenuItem Header="_File"> <MenuItem Header="New" /> <MenuItem Header="Open" /> <Separator /> <MenuItem Header="Exit" Click="MenuItemClicked" /> </MenuItem> <MenuItem Header="_Edit" /> <MenuItem Header="_View" > <MenuItem Header="Grid" IsCheckable="True" IsChecked="True"/> <MenuItem Header="Snap To Grid" IsCheckable="True" IsChecked="True" /> </MenuItem> </Menu> </Grid> </Window>
Anyone spot what I'm messing up here? The width and height of the WindowsFormsHost are static (500) just while I'm trying to figure out what's going on.
I'm guessing it's to do with the way I'm setting the viewport.
When a resize event triggers, I pass with width and height of the control to a function that creates a new viewport at (0,0,width,height).
I can offset the y coordinate of the viewport to make it look like the control is rendering at the correct point, but I'm not sure where that offset is coming from. Given the code above, if I subtract 20.0f from the viewport's Y coordinate it renders correctly.