I want to create a mobile application that can show where is your friends and in which direction they are facing. I want to use positionIndicator at first but I can't create one more positionIndicator on the map view. Then I turned to MapMarker, But I found I can't rotate it and scale it. And I tried MapLocalModel, but I don't think it's a good idea to use a 3d module to render a 2d object. Then I think I should create a new MapObject class. But the constructor of MapObject is package protect. I can't call it or override it. So, what's the correct way to implement it?
MapLocalModel in general is the right approach for a marker which could be rotated. Agree that for 2D object MapLocalModel is not the best approach however the alternative would be rotating the image used for MapMarker itself which might also have some performance hit.
Related
I am having trouble getting my simple JavaFX Maze Game to work. I just wanted to do this to test how much I knew, and I have gotten almost to the end.
All I want to do now is see if there is a way for me to combine all of the Rectangle2D Boundaries into a single bounding shape for me to do collision detection with.
Right now, I have maze walls set up like
this, and I have to check for collision against every single one of the wall objects, which I have contained in a list.
What I want to know is there anyway of turning that into a single shape that I can check collision against. That would make my job so much easier when it comes to finishing my game.
EDIT 1: The red boxes in the image are just there to represent the Rectangle2D bounding boxes. They will not actually be there in the final product.
EDIT 2: All of these have been created using a simple black square sprite, and all of the bounding Rectangle2D boxes are using the javafx.geometry package, not the javafx.scene.shape package.
Any help would be appreciated. Thanks in advance!
Do you mean union many shapes into one?
Thanks to the help of the comment thread on Powercoder's answer, I was able to get it figured out. Instead of using javafx.geometry classes, I was able to switch to javafx.scene.shape classes, which allowed me to finish everything I was trying to do.
Here is my old code: https://pastebin.com/1DBXuq79
and here is my new code: https://pastebin.com/uXTrcsZ2
For anybody who wants to compare and figure out how I changed it.
Qt3D makes it very easy to display some mesh primitives:
m_torus = new Qt3DExtras::QTorusMesh();
but I would just like to display a collection of points. I haven't seen anything like
m_points = new Qt3DExtras::QPoints();
Is there a way to do this without writing lower level OpenGL?
Don't know if this is what you're looking for but check out Qt3DRender::QGeometryRenderer. I use it in a project to display map lines in a 3D scene.
There is a method to define how the vertex buffer data shall be rendered (where I use Qt3DRender::QGeometryRenderer::LineStrip instead of Qt3DRender::QGeometryRenderer::Points):
Qt3DRender::QGeometryRenderer::setPrimitiveType(Qt3DRender::QGeometryRenderer::Points);
AFAIK, There are no simple primitives like lines or points available in Qt3D 2.0, because there is just no one-size-fits-it-all solution. If you are lucky, someone will step up and add something to extras, else you have to write your solution yourself.
Qt Interest Mailing List Nov 2016 - Lines in Qt3D
There is however, a pcl point cloud renderer project on github!
I'm trying to use to SketchUp API to navigate around 3D models (zoom, pan, rotate, etc). My ultimate aim is to integrate it with a Leap Motion app.
However, right now I think my first step would be to figure out how to control the basic navigation gestures via the Sketchup API. After a bit of research, I see that there are the 'Camera' and the 'Animation' interfaces, but I think they would be more suited to 'hardcoded' paths and motions within the script.
Therefore I was wondering - does anyone know how I can write a plugin that is able to accept inputs from another program (my eventual Leap Motion App in this case) and translate it into specific navigation commands using the Sketchup API (like pan, zoom, etc). Can this be done using the 'Camera' and the 'Animation' interfaces (in some sort of step increments), or are there other interfaces I should be looking at.
As usual, and examples would be most helpful.
Thanks!
View, Camera and the Animation class is what you are looking for. Maybe you don't even need the Animation class, you might just be ok with using the time in the UI class. Depends on the details of what you will be doing.
You can set the camera directly like so:
Sketchup.active_model.active_view.camera.set(ORIGIN, Z_AXIS, Y_AXIS)
or you can use View.camera= which also accept a transition time argument if you find that useful.
For bridging input you could always create a Ruby C Extension that takes care of the communication between the applications. There are some quirks in getting C Extensions work for SketchUp Ruby as oppose to regular Ruby though - depending on how you compile it.
I wrote a hello world example a couple of years ago: https://bitbucket.org/thomthom/sketchup-ruby-c-extension
Though note that I have since found a better solution for Windows, using the Development Kit from Ruby Installers: http://rubyinstaller.org/
This answer is related to my comment above regarding the view seemingly 'jumping' when I assign a new camera to the current view using camera=, but not if I use camera.set.
I figured out this was happening because the camera FOV for the original camera was different, and the new camera was defaulting to an FOV of 30. By explicitly creating the camera with the optional perspective and FOV arguments from the initial camera solves this problem:
new_camera = Sketchup::Camera.new new_eye, new_target, curr_camera.up, curr_camera.perspective?, curr_camera.fov
Hope people find this useful!
I want to use Qt to draw lines in chalk style, as you typically see on a blackboard. Here is an example of what I have in mind:
What is the best way to achieve this rendering style? Do I need to draw a lot of little lines with a special brush, or is there a better way to get the "curvy" style you see in the sample image?
And where is the best place to integrate this? Theoretically it would be ideal to get this underneath QPainter, e.g. in a custom QPaintEngine, so that e.g. all the various QPainter::drawLine calls end up using the chalk style. However, it seems while the QPaintEngine interface looks perfect for this, the class itself isn't meant to be used for this purpose...
Thanks in advance for any help.
Greetings,
Fabian
I have solved the problem in a different way. Using textured brushes didn't provide good results (maybe my fault). QGraphicsEffect was unfortunately not an option since my rendering is not based on QGraphicsView.
What I have done in the end:
Derived an own class from QPainter (i.e. ChalkPainter)
Added a new drawChalkLine() method to ChalkPainter. This method takes the passed line, splits it into smaller chunks and renders these chunks as bezier curves via QPainter::drawPath. For each bezier curve chunk I randomly shift the control point orthogonal to the line.
Next I added additional rendering methods to the ChalkPainter class, such as drawChalkRect(), all internally using the drawChalkLine() method.
This is not the most elegant method since I can't use the QPainter methods directly, but it provides good results for my purpose. Here is an example:
I would start looking in QGraphicsEffect's way.. I think it should be possible to develop such a filter which will produce similar effect..
I'll update in here answer on your comment.
No, QGraphicsEffect can be applied 'per graphics item'. If you have a look on QGraphicsItem you will see that there is a setGraphicsEffect method, so you can design an effect which works on QGraphicsLineItem for example and set it only on lines you want to look chalky..
Important thing is that you don't have to operate on pre-drawn image, you can either make it completely owner-draw item with graphicsEffect (for example make an assumption that effect is only applicable on QGraphicsLineItem) pre-draw it using drawSource() and then modify OR draw it completely from scratch..
I would love to help you with some coding, probably will do it somewhere around next week, since I will need similar thing for project I am working on now.. but physically don't have time next few days..
I'll update an answer with sources link as soon as it's done.
Custom brush also looks really promising..
I'm trying to create a vehicle which throws a ball (or, say, a spherical projectile) when clicking. I already have this vehicle doing the right thing, but I'd like it to throw a yellow-colored ball. I created a yellow texture but I don't know how to apply it specifically to the projectile.
I have to run the map on Unreal Tournament 3, so I may not be able to use the Unreal Development Kit.
Do you have some clues or an idea on how to do that?
Thanks
You'll have to plug your Texture into a Material and assign that Material to your projectile mesh. You can do that in the editor, or you can override the mesh's materials in code inside the the mesh component by adding entries to the Materials array, e.g.:
Begin Object Class=StaticMeshComponent (or SkeletalMeshComponent) Name=ProjMeshComp
StaticMesh=<your mesh>
Materials(0)=<the material you created>
End Object
Is the projectile you are shooting a custom projectile?
If it is, look in your projectile class for a particle system component or a static mesh component reference similar to the answer Phillip posted. You will see something like:
ParticleSystem'SomePackage.SomeGroup.AssetName'
//or
StaticMesh'SomePackage.SomeGroup.AssetName'
The GroupName might not be present.
Then open up your editor and in your content browser find the package (in this case SomePackage). Right click it and be sure to Fully Load it. Now you should see your ParticleSystem or Static Mesh. If its a particle system, you need to edit the mesh module of the particle in cascade to use your material; otherwise you just reassign the static mesh material as usual.
If its not a custom projectile, you need to figure out which projectile class you are using and then do the above; a good starting place is the UTProjectile hierarchy of code.