Is possible to change the dimension of my guide without the other things inside move?
I just redisposed objects inside and I want to shrink the dimension of my GUI because is too large with respect the occupied space.
I already tried the same thing to enlarge it, but when I do it all the objects resize as well in a proportional way, while what I want to do is just cut a black part of the window. Is it possible?
You should change the Resize Behavior to something other than "Proportional".
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Using OpenGL and GLUT, I want to render a scene from two different viewpoints. For the first viewpoint, it is a standard perspective projection using shaders. For the second viewpoint, it is a visualisation of the depth buffer. I want these two images to be contained within the same window, side-by-side.
So far, I have been using GLUT for display. For example, I use:
glutInitWindowSize(1000, 1000);
glutInitWindowPosition(500, 200);
glutCreateWindow("OpenGL Test");
This will draw my scene across the entire window for the one viewport which I have defined. But can I use GLUT to draw two different images from two different viewports, as described above? Or perhaps this is not so easy with just GLUT, and I will need to create a window natively in my operating system (I am using Ubuntu), and then define two different areas in that window which I should draw upon...
Thank you!
GLUT ultimately has nothing to do with it. It creates and manages a window. What you do within that window is entirely up to you.
What you need to do is use the viewport transform. Because the viewport happens after clipping, no primitives outside of the range of the viewport transform will be rendered to (by drawing commands. Buffer clearing will still clear the whole framebuffer). This effectively defines the region of the window that all vertices will lie within.
So you call glViewport, specifying half of the window. Then you render the stuff you want in that half. Then you call glViewport to specify the other half. Then you render the stuff you want there. And then you're done; just swap buffers.
However, this also means that the typical tactic of only calling glViewport in your GLUT resize callback will not work. You must store the window's current size, then use that in your display function.
Two ways you can do this:
You can create a new window with glutCreateWindow(). Note that this will have a different OpenGL context. Also note that it has a return value, an integer.
You can select part of the window using glViewport(), and then call glViewport() again to draw into a different part of the same window.
There is always the option of rendering your two views into a single texture, and then simply making a screen size quad and rendering that texture onto your quad.
I'm not sure its going to satisfy all your needs, but from a visual perspective this should give you the same result.
I'm developing a little videogame in which I have an infinite background image which moves horizontally. The image obviously is not infinite, it just finishes the same way it starts, so if I concatenate the image with itself, it seems is infinite.
The problem I'm having is that in the place where the two images join, a vertical black line appear. Looks like is not joining them in the exact position and I can see the black background.
I thought it was because the width of the images were not integers, but even if I superimpose one image over the other, the black vertical line still appear.
Any tips please?
What you are trying to do is called tiling. The image should be inherently 'tile-able'. To do this, put two copies of the image side by side, edges flush with each other and see if they are seamless.
Now then, to make things work in OpenGL, the simplest way might to make the quad (i.e. the mesh) holding your background pretty large and map this texture to a small part of this mesh (so that the image itself doesn't look stretched). Use the GL_REPEAT flag when texture mapping so the image is tiled across the entire large quad.
I want to use multiple irregular picture makes up a map, each picture is a button.Transparent part of the images will overwrite each other, how should I do to make their control areas does not overlap.
I use a lot of pictures makes up a large map.
And each piece of the map is irregular, but their control area is a rectangle. Because they all have transparent pixels.
I just want to make the hit area and their shape becomes the same.Some encountered a similar problem?
I have implemented one for the cocos2d-x v3.x:
https://github.com/yszheda/cocos2d-x-irregular-button
It works OK on cocos2d-x v3.2. Maybe you can have a try XD
I am making a GUI in OpenGL (more specifically lwjgl). I have tried hard to research different ways of doing this but I am having a hard time finding exactly what I want. I do not want to use any external libraries (only ones built in OpenGL, even trying to stay away from using GLUT) and I would like to have it work on anything that supports OpenGL (ex. Frame Buffer Objects don't work on older graphic cards).
I am making a 3D GUI with a scrollable panel as a component. The problem is I don't know how to draw a partial GUI component without doing a lot of calculations to only render part of it. I am making the components out of OpenGL primitives, not textures. I was hoping there is an easy way to do this like use multiple viewports. I don't really even understand what viewports are.
In short: I need to have a scrollable panel as a component overlapping other GUI components (since it will be a drop down menu) and not let any of the components in my panel draw outside my panel.
If you just want to prevent drawing pixels that are outside of a rectangular region (and I think that's what you're asking), than glScissor is exactly what you're looking for.
In lwjgl, you can find the function in org.lwjgl.opengl.GL11.
If you want to scroll a larger scene within a fixed region on the screen, the most straightforward way to go is by just modifying your projection matrix for the scroll position and redrawing the scene. If you are using gluPerspective to set up your projection matrix you'll have to convert it to a direct call to glFrustum; if you're using glOrtho it's much more straightforward.
Keep in mind that "scrolling" a perspective view has no one right way to do things - it depends on what sort of effect you want to achieve, and what particular sort of distortion you want near the edges of the overall viewport.
I am a complete novice when coming to using Flash but I am looking to create an animation similar to the line into text animation at:
http://www.louisebradley.co.uk/fl/
where instead of running from the top of the screen I want the line to effectively stretch across my homepage horizontally.
I have created an animated gif that does the job but it takes a long time to stretch across 974 pixels in width, and if the frames are reduced it takes away any smoothing effect. I did this in photoshop by simply creating 20 or so frames, each increasing the size of the line by 60 pixels until the full page is covered.
Would I be better off creating the effect in Flash? And if so, where on earth do I start!! Would tweening do this, and how I would I implement it?
Thanks in advance for any help!
I am assuming you are talking about the line to the left of the main navigation? If this is the case, this is being done using a mask that is tweened. You can simply draw out the shape you want "wiped" across the screen and than on the layer above it, draw a box over the shape to be animated. Right click the layer the box is on and select "mask". You can now tween the mask to move from right to left over the shape you drew and it will appear to wipe over. Just remember, whatever the mask is currently over, is what will show through from the layer that is masked. Think of the mask as a window. This can be completely done without actionscript and only using the timeline.