I have a simple OpenGL application which I'm trying to enable antialiasing (4x MSAA) for. I can't seem to figure out how to do this using AndroidGameView.
So far I've been forcing 4x MSAA through the Developer Settings menu as a short term solution but I'd like to be able to do this programmatically. Can anyone shed some light on this?
Turns out that the way to do this programmatically is to set the GraphicsMode property in the CreateFrameBuffer() override of your class inheriting from AndroidGameView:
protected override void CreateFrameBuffer()
{
// Create a graphics context for OpenGL ES 2.0
ContextRenderingApi = GLVersion.ES2;
// Set the graphics mode to use 32bpp colour format, 24bpp depth, 8bpp stencil and 4x MSAA
GraphicsMode = new GraphicsMode(new ColorFormat(32), 24, 8, 4);
// Create the frame buffer itself by calling the base class method
base.CreateFrameBuffer();
// Custom initialization code here
}
Thanks to Cheesebaron for leading me down the path of looking into the GraphicsMode property of AndroidGameView.
Related
First time working with PDFSharp, I have a win form that enables the user to select a font and size of it for the PDF to be created. Also the app draws some rectangles on the page with currently hardcoded color like this:
rect = new XRect(5, 300, 25, 15);
gfx.DrawRectangle(XBrushes.SeaShell, rect); //SET COLOR TO RECT
tf.Alignment = XParagraphAlignment.Center;
tf.DrawString("No", invoiceItemsHeaderFont, XBrushes.Black, rect,
XStringFormats.TopLeft);
I want the user to be able to pick the color via a drop down. How can I load all of the colors from XBrushes. to a list and then parse it as such, this is one of the attempts:
foreach(XBrushes xbrush in typeof(XBrushes)
{
colorsRect.Add(xbrush.ToString());
}
Thank you all!
I know this is a bit late but maybe this could help someone else.
I take it you are just looking to get a collection of the different brushes?
I looked at the XBrushes class and all its public static properties seem to be brushes. You could use reflection to go through all its properties and get the values of the ones that are brushes.
Something like:
public static IEnumerable<XSolidBrush> Brushes
{
get
{
return typeof(XBrushes).GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static)
.Select(p => p.GetValue(null))
.Where(b=>b.GetType()==typeof(XSolidBrush))
.Cast<XSolidBrush>();
}
}
I run often into many problems which leads to refactoring my code...
That is why I want to ask for some recommendations.
The problems I'm running into are:
1) Providing data to XAML
Providing simple data to control value instead of using a value converter. For instance I have a color string like "#FF234243" which is stored in a class. The value for the string is provided by a web application so I can only specify it at runtime.
2) UI for every resolution
In the beginnings of my learning I got told that you can create a UI for every possible resolution, which is stupid.
So I've written a ValueConverter which I bind on an element and as ConverterParameter I give a value like '300' which gets calculated for every possible resolution... But this leads to code like this...
<TextBlock
Height={Binding Converter={StaticResource SizeValue}, ConverterParameter='300'}
/>
3) DependencyProperties vs. NotifyProperties(Properties which implement INotifyPropertyChanged) vs. Properties
I have written a control which takes a list of value and converts them into Buttons which are clickable in the UI. So I did it like this I created a variable which I set as DataContext for this specific Control and validate my data with DataContextChanged but my coworker mentioned that for this reason DependencyProperties where introduced. So I created a DependecyProperty which takes the list of items BUT when the property gets a value I have to render the buttons... So I would have to do something like
public List<string> Buttons
{
get { return (List<string>)GetValue(ButtonsProperty); }
set
{
SetValue(ButtonsProperty, value);
RenderButtons();
}
}
// Using a DependencyProperty as the backing store for Buttons. This enables animation, styling, binding, etc...
public static readonly DependencyProperty ButtonsProperty =
DependencyProperty.Register("Buttons", typeof(List<string>), typeof(MainPage), new PropertyMetadata(""));
private void RenderButtons()
{
ButtonBar.Children.Clear();
ButtonBar.ColumnDefinitions.Clear();
if(Buttons != null)
{
int added = 0;
foreach (var item in Buttons)
{
var cd = new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Star) };
var btn = new Button() { Content = item };
ButtonBar.ColumnDefinitions.Add(cd);
ButtonBar.Children.Add(btn);
Grid.SetColumn(btn, added);
}
}
}
And have to use it like this:
<Controls:MyControl
x:Name="ButtonBar" Button="{Binding MyButtons}">
</Controls:MyControl>
Since these are a lot of topics I could seperate those but I think that this is a pretty common topic for beginners and I have not found a got explanation or anything else
1. Providing data to XAML
There are two options: prepare data in the ViewModel or to use converter.
To my mind using converter is better since you can have crossplatform viewModel with color like you mentioned in your example and converter will create platform dependent color. We had similar problem with image. On android it should be converted to Bitmap class, while on UWP it's converted to BitmapImage class. In the viewModel we have byte[].
2. UI for every resolution
You don't need to use converter, since Height is specified in effective pixels which will suit all the required resolutions automatically for you. More info can be found at the following link:
https://learn.microsoft.com/en-us/windows/uwp/design/layout/layouts-with-xaml
There are two options how to deal with textblock sizes:
a) Use predefined textblock styles and don't invent the wheel (which is the recommended option):
https://learn.microsoft.com/en-us/windows/uwp/design/style/typography#type-ramp
Or
b) Specify font size in pixels. They are not pixels, but effective pixels. They will be automatically scaled on different devices:
https://learn.microsoft.com/en-us/windows/uwp/design/style/typography#size-and-scaling
Furthermore, use adaptive layout to have different Layout for different screen sizes.
3) DependencyProperties vs. NotifyProperties(Properties which implement INotifyPropertyChanged) vs. Properties
As per your code you can try to use ListView or ItemsControl and define custom item template.
DependencyProperties are created in DependencyObject and are accessible in xaml. All controls are inherited from DependencyObjects. Usually you create them when you want to set them in xaml. They are not stored directly in the objects, but in the global dictionary and resolved at runtime.
DependencyProperties were created long time ago and you can find lots of links which explain them in details:
http://www.wpftutorial.net/dependencyproperties.html
https://techpunch.wordpress.com/2008/09/25/wpf-wf-what-is-a-dependency-property/
When should I use dependency properties in WPF?
What is a dependency property? What is its use?
What is a dependency property?
INotifyPropertyChanged INPC are the central part of MVVM. You bind your view to viewModel which implements INPC and when you change value of the property control is notified and rereads the new value.
Download the following video in high resolution which explains MVVM in details (by Laurent Bugnion):
https://channel9.msdn.com/Events/MIX/MIX11/OPN03
MVVM: Tutorial from start to finish?
Normal properties are used in model classes or when there is no need to notify UI regarding changes.
So I noticed that an App I made will look messed up if the Font size in the users phone is changed to above medium, I googled a bit found many unanswered or answered but not to the point of the same question.
I want to be able to do that in the PCL class if possible , if not possible then the most interesting platform for me is android so a fix specific for android would do.
Here is a sample of my Xaml code so you can get a reference:
<Label Text="STORE" FontSize="23" HeightRequest="40" WidthRequest="212" VerticalTextAlignment="Center" HorizontalTextAlignment="Center"></Label>
So to be clear the question is how do I prevent the system from overriding my fontsize which is 23 in this case?
Thanks
SImply add this in your MainActivity after OnCreate.
#region Font size change Prevent
public override Resources Resources
{
get
{
var config = new Configuration();
config.SetToDefaults();
return CreateConfigurationContext(config).Resources;
}
}
#endregion Font size change Prevent
For those who still struggle how to disable accessibility font scaling on Android.
You need to create custom renderer for label, button and common input controls like this:
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
[assembly: ExportRenderer(typeof(Label), typeof(MyApp.Droid.Renderers.LabelRendererDroid))]
namespace MyApp.Droid.Renderers
{
class LabelRendererDroid : LabelRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
if (e.NewElement == null) return;
Control.SetTextSize(Android.Util.ComplexUnitType.Dip, (float)e.NewElement.FontSize);
}
}
}
For Xamarin picker controls there is no FontSize property, so we can add it to App class:
public static double NormalFontSize => Device.GetNamedSize(NamedSize.Medium, typeof(Picker));
and then utilize it in picker renderer:
Control.SetTextSize(Android.Util.ComplexUnitType.Dip, (float)App.NormalFontSize);
Also by changing this NormalFontSize property we can set whatever desired font size for picker, as it is not available without renderer.
Have you seen the items in chapter 5 of this book?
https://developer.xamarin.com/guides/xamarin-forms/creating-mobile-apps-xamarin-forms/
Although not an exact answer, depending on what you are attempting to do you might be able to use the example at the end of the chapter modified to allow for a "Max" font size. All from within the PCL.
It's worth noting however that the inability to scale the font to a big size could be an indication of accessibility problem.
As the title says it, is there a way to animate a UIVisualEffectView's blur radius? I have a dynamic background behind the view so the ImageEffects addition can't be used... The only thing that can do this as far as I know is to animate the opacity but iOS complains saying that doing that breaks the EffectView so it definitely seems like a bad idea... Any help would be gladly appreciated.
The answer is yes. Here's an example for animating from no blur -> blur:
// When creating your view...
let blurView = UIVisualEffectView()
// Later, when you want to animate...
UIView.animateWithDuration(1.0) { () -> Void in
blurView.effect = UIBlurEffect(style: .Dark)
}
This will animate the blur radius from zero (totally transparent, or rather - no blur effect at all) to the default radius (fully blurred) over the duration of one second. And to do the reverse animation:
UIView.animateWithDuration(1.0) { () -> Void in
blurView.effect = nil
}
The resulting animations transform the blur radius smoothly, even though you're actually adding/removing the blur effect entirely - UIKit just knows what to do behind the scenes.
Note that this wasn't always possible: Until recently (not sure when), a UIVisualEffectView had to be initialized with a UIVisualEffect, and the effect property was read-only. Now, effect is both optional and read/write (though the documentation isn't updated...), and UIVisualEffectView includes an empty initializer, enabling us to perform these animations.
The only restriction is that you cannot manually assign a custom blur radius to a UIVisualEffectView - you can only animate between 'no blur' and 'fully blurred'.
EDIT: In case anybody is interested, I've created a subclass of UIVisualEffectView that gives you full control over blur radius. The caveat is that it uses a private UIKit API, so you probably shouldn't submit apps for review using it. However, it's still interesting and useful for prototypes or internal applications:
https://github.com/collinhundley/APCustomBlurView
I'm newbie in using ogre3D and I need help on a certain point!
I'm trying a library mixing ogre3D engine and qtml :
http://advancingusability.wordpress.com/2013/08/14/qmlogre-is-now-a-library/
this library works fine when you want to draw some object and rotate or translate these objects already initialise in a first step.
void initialize(){
// we only want to initialize once
disconnect(this, &ExampleApp::beforeRendering, this, &ExampleApp::initializeOgre);
// start up Ogre
m_ogreEngine = new OgreEngine(this);
m_root = m_ogreEngine->startEngine();
m_ogreEngine->setupResources();
m_ogreEngine->activateOgreContext();
//draw a small cube
new DebugDrawer(m_sceneManager, 0.5f);
DrawCube(100,100,100);
DebugDrawer::getSingleton().build();
m_ogreEngine->doneOgreContext();
emit(ogreInitialized());
}
but If you want to draw or change the scene after this initialisation step it is problematic!
In fact in Ogre3D only (without the qtogre library), you have to use a frameListener
which will connect the rendering thread and allow a repaint of your scene.
But here, we have two ContextOpengl: one for qt and the other one for Ogre.
So If you try to put the common part of code :
createScene();
createFrameListener();
// La Boucle de rendu
m_root->startRendering();
//createScene();
while(true)
{
Ogre::WindowEventUtilities::messagePump();
if(pRenderWindow->isClosed())
std::cout<<"pRenderWindow close"<<std::endl;
if(!m_root->renderOneFrame())
std::cout<<"root renderOneFrame"<<std::endl;
}
the app will freeze! I know that startRendering is a render loop itself, so the loop below never gets executed.
But I don't know where to put those line or how to correct this part!
I've also try to add a background buffer and to swap them :
void OgreEngine::updateOgreContext()
{
glPopAttrib();
glPopClientAttrib();
m_qtContext->functions()->glUseProgram(0);
m_qtContext->doneCurrent();
delete m_qtContext;
m_BackgroundContext= QOpenGLContext::currentContext();
// create a new shared OpenGL context to be used exclusively by Ogre
m_BackgroundContext = new QOpenGLContext();
m_BackgroundContext->setFormat(m_quickWindow->requestedFormat());
m_BackgroundContext->setShareContext(m_qtContext);
m_BackgroundContext->create();
m_BackgroundContext->swapBuffers(m_quickWindow);
//m_ogreContext->makeCurrent(m_quickWindow);
}
but i've also the same error:
OGRE EXCEPTION(7:InternalErrorException): Cannot create GL vertex buffer in GLHardwareVertexBuffer::GLHardwareVertexBuffer at Bureau/bibliotheques/ogre_src_v1-8-1/RenderSystems/GL/src/OgreGLHardwareVertexBuffer.cpp (line 46)
I'm very stuck!
I don't know what to do?
Thanks!