I'd like to draw a scalable field of hexagons with java3d.
I'm new to java3d so i looked up the documentation. As far is I know there is no direct way to paint something like that. I found the possibility to draw an triangle. Is there a way to combine two of them to a hexagon, or is there a better way to do this?
Thanks for your help!
Just create a polygon, look at this example. You have to create a GeometryInfo instance by using GeometryInfo.POLYGON_ARRAY to indicate you're going to build a polygon. Then, put your vertices into it and build a Shape3D with the geometry array of your GeometryInfo instance.
By the way, check that you use the latest version of Java 3D (currently 1.6.0).
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If I select one of these co-ordinates, I want to highlight that point on the diagram (by a circle or whatever shape possible). Also I would like to save it later on.
I'm not sure if Appcelerator is flexible enough to do all these things (My search didn't yield much apart from here, this only supports Android), If not I'll have to generate this diagram in my webservice and pull it back on UI once there is an update in the co-ordinate array.
I've used Chartist inside a webview and it worked great. It produces a SVG graph instead of a canvas object which performs better.
If you want to use hyperloop you can use Ti.AndroidCharts
I just started coding some basics in SharpDX (VB.net) and I already got it to Render a 2D triangle. And I know how to render other 2D stuff, but I want to create something in 3D where I'm able to rotate the camera around some cubes. I tried it, but failed at converting the 3D Space to screen coordinates. Now Here are my Questions:
How can I calculate a Matrix for Perspective projection?
How can I pass that Matrix to my Vertex Shader
How can I make the Camera rotate around the Objects when I drag the mouse over the screen?
Please explain these things to me and give some code examples. I'm just a Beginner in SharpDX and everything I found was just not understandable for me.
A few things you can do when you first start.
Firstly, there are some great examples you can leverage (Even in c# but you need VB) that you can use to learn from.
I suggest you look at this within the Sharpdx repository. Sharpdx direct 3d 11 samples
Within these examples (especially triangle example), it goes through the basics including setting up the device, the creation of simple resources to bind to your GPU and compiling the bytecode.
The samples though use the effects methodology, which is deprecated and as such once you become familiar with compiling code, I would advise moving away from this paradigm.
The more advanced examples will show you how to set up your matrices.
The last item you wanted to know about is mouse movement. I would advise just having a look at MSDN around mousemove events. You will need to bind one to your window/control and then read the deltas. Use those deltas to create your rotation/movement based upon this. Look into Vector3 (sharpdx), basically, you need to do this all in vector space and then create the various translation/rotation matrices from this.
Hope this is start.
I already have a function that can return a tile for a given position. I am trying to make it so that when I scroll around it will load new tiles on the fly. I am having trouble figuring out how to attack the problem. I am sure that someone must have done this before and I would prefer to not reinvent the wheel on this.
Can anyone point me to a tutorial or some example code?
If not, can perhaps help me figure out how to do this?
I am using Kobold2D and the map is not going to be static, it will be generated on the fly, Minecraft style.
CATiledLayer is perfect for this. However, I do not know if this will play well with Cocos2d.
I am making my first program using Java3D. I have setup some transformGroups that I now need to move in calculated directions. When I looked this up, I found interpolators and alpha objects and waveforms and couldn't understand a word of it. I have done this in the past in OpenGL using simple vectors and frame refreshment. Is there a similar simple way in Java3d? Thanks.
There's no reason you couldn't do it with vectors and frame refresh in Java3D as well.
A simple way would be to attach a behavior to the scenegraph with a WakeupOnElapsedFrames(0) condition, and then have it update the needed transform every frame.
As its simplest, that is was the interpolators are doing for you. Once you get that working, it will probably make more sense as to how you could do it with interpolators.
Imagine I have a rectangle say 400px x 300px. Then let’s say I want to load an image in that. All of this is very easy using Sytem.Drawing.DrawImage.
Rectangle http://img576.imageshack.us/img576/2363/rectangle.gif
But then I want to leave the left hand side as 300px but change the right hand side to 250 px. I can draw the box using 4 DrawLines but I don’t know how to squash the image into the new shape. I want the right hand side of the shape to be 250, the left size 300 and the top and bottom 400px.
Resized http://img85.imageshack.us/img85/3479/rectangle2.gif
I can’t use DrawImage as it expects the left and right sizes to be the same. Is there a way to manipulate the image into the new shape?
I've looked at other questions, but they only apply where the left and right hand side is equal.
Any thoughts on how to squash an image into a shape which did not have parallel sides?
(If it helps, I'm happy to sacrifice image quality to fit the right shape.)
Disclaimer: I work for Atalasoft.
Our DotImage product has a command called QuadrilateralWarpCommand that can do this. It's in DotImage Photo.
What you want to do is non-trivial (but also very powerful).
#Heinzi is correct, the general class is called warp transformations. What you're trying to do is specifically a perspective transformation. At a high level, it involves running the individual coordinates through a transformation matrix to get their new positions, and then doing interpolation between pixel values based on the old and new locations.
This article talks about some transformations, one of them being a sheer, so it might be helpful overall. I'm not sure, I haven't read it closely. In general, you want to google for something approximately like "c# image transformation" or "c# image perspective transform".
Depending on what you're planning on using it for, buying a library might be the best way to go about it, although there is a lot to learn about image manipulation by doing it yourself.
I did not find a solution to your problem, but I have some information which might help you along:
What you want is called a warp transformation.
As far as I know, the .net framework natively supports this kind of transformation only for a GraphicsPath, namely, the GraphicsPath.Warp method. Unfortunately, I don't think that this will help you, unless you are willing to redraw your image using a .net GraphicsPath object.
If you need the transformation directly in the UI layer, your UI library might help: Silverlight, for example, includes the PlaneProjection class, which can be used for such effects; in WPF, the 3D engine might be useful for this (requiring more programming effort, through).