GameViews in OpenTK-1.0 initialize the context in CreateFramebuffer() and destroy said context in DestroyFramebuffer(). What if I want to hold onto my VBOs and just create a bunch of new FBOs? For example, on rotation, I need to create newly sized FBOs, but I don't want to have to completely reload all my VBOs and I just don't understand how this would work without completely reimplementing all/most of GameView. I can't just override these two methods, because the base class does not expose a setter on Renderbuffer or Framebuffer. What am I missing here?
In sum: I want to rotate the device and get a new OpenTK-1.0 FBO, but not destroy the context. How do I go about this?
CreateFramebuffer() creates an OpenGL context, not a framebuffer object. To create a FBO, call GL.GenFramebuffer(). To destroy it, use GL.DeleteFramebuffer().
Refer to the OpenGL wiki for more information. This is written for desktop OpenGL, but this article also applies to OpenGL ES.
Related
I am working on Geotools and trying to edit an existing layer at run time.
Basically I have a layer which I have added on to a MapContent object, which I then project it on JFrame. Now what I want to know is that can we manually draw some features on this showing on JFrame to edit this layer by drawing some features( which could be either a point or a polygon).
Yes, that is perfectly possible. You will need a Swing tool to handle the drawing and then some way to add any needed attributes to the geometry to make a new feature (see SimpleFeatureBuilder) and then add that to the layer.
1、I want to create a circle and set an image that customized to fill the circle，use this as a marker on the map, not only could change the image but also the color of circle anytime，what can I do to implements this function? Please look at the picture below!
2、Like your CityMaps app show，when I enlarge the map, some business icon that hide are show on the map，which are hide again while shrink the map, How to achieve this effect？
3、After I initialization the Object Marker and called the method marker.setFadeTime(3000)，the software give my tips the method is no exist and I see the class Marker.java but really not find the method，Why is it so？
4、I want to add some stars beside the marker like this:
What can I do to add the stars？the label only can set the text beside the marker.
5、I want to load your maps at the fragment，not the activity that extends FragmentActivity，I found the SupportCitymapsMapFragment is no use，What I can do to complete this requirement?
6、In your apps，it is locate that place after input New York in the search box，What can i do to complete this function whatever i input？
7、During I develop the apps about the Citymaps，I found a serious problem so that your apps had happend too. When I run the apps， the program force flash back all of a sudden and I run your apps Citymaps at this time，the problems are same of the front，I found some error in logical view that is follows：15327-15374/com.map.maplbs A/libc﹕ Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 15374 (Thread-1819).
To solve the problem，I must restart my device. Why is it so？
I am a developer on the Citymaps SDK, I will do my best to answer your questions.
1) I recommend using the Android Canvas API to construct the images, and then use a Marker to display it on the map. See the documentation for details: http://developer.citymaps.com/markers
2) This is built into the Citymaps BusinessLayer. This functionality is not exposed through an API. If you wish to use the Citymaps BusinessLayer, you should create a CitymapsMapView or CitymapsMapFragment/SupportCitymapsMapFragment and it will automatically be added to your map.
3) At this time, there appears to be a known issue with the fadeTime API. Thank you for bringing this to our attention. We will fix it in an upcoming release. For now, you can animate the alpha property of the Marker.
4) Once again, the functionality of the BusinessLayer is not directly exposed. If you wish to create similar markers, I recommend you construct the image using Android's Canvas and then adding it as a Marker to the map.
5) If you wish to load the map inside of a fragment, you can accomplish this using child fragments (check Android documentation for more details). You can also accomplish this by instantiating CitymapsMapView or MapView directly and adding it to your view hierarchy either in XML or in code. However if you do this, remember to call the lifecycle methods on your map instance, or else the map will not behave properly.
6) If you wish to have a search in your app, it is up to you to implement this feature. We do not currently provide a search API out of the box.
7) Thank you for the bug report. We will investigate this issue and fix it in a future release.
If you have any more questions, feel free to ask, and thank you for using the Citymaps SDK.
I want to have a custom MKOverlay that's a circle anchored to the user location annotation that the user can resize by pinching. I was able to successfully achieve this using MKOverlayPathRenderer and a custom MKOverlay object by overriding the createPath method and making an arc. The resizing and moving of the overlay was handled by using KVO on the radius and coordinate properties of my overlay. However the resizing was incredibly choppy and the boundingMapRect wasn't correctly calculated.
I've also tried using an image and instead of subclassing MKOverlayPathRenderer just MKOverlayRenderer, overriding - (void)drawMapRect:(MKMapRect)mapRect zoomScale:(MKZoomScale)zoomScale inContext:(CGContextRef)context but when I resize my CPU percentage jumps to 160% usage (not great yeah?) and the boundingRect is again being drawn incorrectly.
I really think the way to do it is with MKOverlayPathRenderer and maybe having an atomic counter of some kind so that a redraw only gets called say every 5 or 10 times the pinch gesture is triggered.
Does anyone have any suggestions? I've also considered but haven't tried making a UIView and adding it as a subview to the map view and putting the pinch gesture on that but that seems hacky and dirty.
When you computed new boundingMapRect on the Overlay, you must invoke invalidatePath on your Renderer. After that, system will invoke createPath for you when appropriate.
I have implemented a TabBarController much like the Conference tutorial for iOS. Everything is working well now except it appears that the Init methods on Viewmodels for the tabs never get called as it normally would.
Is there something I forgot to do to ensure that Init is called? If I must, I could move this code to the constructor of the ViewModel, but I'd like to avoid this if possible.
EDIT
I guess what I'm really asking here is if I manually instantiate a viewmodel and "create" a view from it via the extension/helper methods, will init get called at some point in the process? If so, at what point can I expect init to get called on the viewmodel?
The Construction-Initialize-ReloadState-Start (C-I-R-S) sequence is called on an MvxViewModel if it is created using the default ViewModel locator - which is what happens when you call ShowViewModel.
If the ViewModels for the sub-tabs are created by calling new on a ViewModel directly - like in the Conference HomeViewModel.cs#L11 - then obviously this same sequence doesn't happen.
Really the difference here is between:
the tab ViewModels which are just INotifyPropertyChanged objects
the page-level MvxViewModels which are also INotifyPropertyChanged objects, but which you further expect to be initialized within navigations.
If you wanted to unify the two concepts then you probably could... but actually I suspect it might be simpler and cleaner to perhaps give the two class types different names, to just put the init code in the constuctor for the tab view models, or perhaps to just call Init on them yourself in the Home constructor.
Is it possible to create your own Layer?
like:
public class MyLayer extends javax.microedition.lcdui.game.Layer{
(...)
}
i get the error: "Layer() is not public in Layer; cannot be accessed from outside the package."
I wanted to draw some 2D graphics (import javax.microedition.lcdui.Graphics), and on top of that a Sprite coursor. Graphics are mostly still, so there's no need to draw them every time, so i thought layerManager will help me, but with that one i'd need it to be a Sprite or a TiledLayer. Creating my own Layer would solve the problem.
Layer is not designed for extension outside the javax.microedition.lcdui.game package. The error messages is clear about it.
But you may extend TiledLayer or Sprite.
Update
As paint method on both classes is final (pointed by #bartholomew-surma on comments) my above statement is invalid.
Another approach is to create a mutable Image, call getGraphics method, draw the 2D graphics in it and finally paint the sprite.