I'm been developing for iOS for about 6 months now and have an idea for an app which reqires that the user touch input is traced on the screen.
My experience with iOS development is solely with navigation-style application so I've never had to deal with any graphical frameworks.
So my question is what framework(s) should I use the accomplish this?
The path tracing will be the only graphical part of the app so I feel that some game-development frameworks like openGL ES and cocos2d may be overkill; but then again I don't know.
Thanks in advance for any help!
The simplest way is to use CGPathRef/CGMutablePathRef/UIBezierPath, which are part of Quartz and UIKit (which you should already be familiar with.) Use the touch points to construct your path. Create a subclass of UIView, and in its -drawRect: method, draw the path.
Does that help?
Related
I need to implement on-screen drawing feature within one of my apps. I would imagine it would be an on-screen transparent overlay. I'm looking to be able to trace the finger path and leave a line, select colors and have erase/undo feature.
I did some research of what's currently on the app store, and a lot of those apps look similar and use similar brushes.
Something tells me that they look too much alike for this to be a coincidence. Does apple provide any built-in finger painting canvas, or are there some widely-known open source projects for on-screen drawing?
Thank you!
I ran into the same thing while looking for examples when I got started with drawing, so I released my efforts as a sample project called SimpleDrawing. I tried to keep things basic while supporting most/all of the standard drawing tools and operations.
There is the GLPaint project, which you can get here.
Other than that, you could use CoreGraphics & -touchesBegan:withEvent: if you wanted.
How would I go about adding a 3D object from Maya into an iOS app? For now, before it gets too complicated, I just want to add it in, no response to touch yet. Is there a tutorial about this? Thanks!
Edit: It doesn't necessarily have to be Maya. I can learn how to use another program.
Molecules is a great open source iOS app that uses OpenGL ES to render 3D objects that have nice touch interaction. Maybe that would be a good starting point.
Go to Xcode and start an OpenGL-ES Project.
Export your maya-model to *.obj(Wavefront)-format and use Jeff Lamarches obj-loader to create c-header files that you can include into your iPhone project!
For a more modern example of rendering 3D meshes, check out this library. It comes with an OBJ parser, so if you can export your geometry as an OBJ file, you can render and interact with it using the library on iOS. Here's a short video of the library in action.
If you look at the Notes app on the iPad, you can see it uses all native iPhone controls, but they're "skinned" to look like a pad of paper. What's the best way to implement something similar to that? Could I use interface builder and simply change the background image for each of the controls, including the TableViews?
Thanks in advance for all your help! I'm going to continue researching this question right now.
This article from Dr Touch will probably come in handy: Stuff you learn from reverse engineering Notes.app
It's a little more complicated than that. My suggestion is manifold:
Hire a real designer to make the artwork.
Subclass whatever controls you want to skin, and handle this business directly in drawRect:. Interface Builder will not help you in this instance.
Consider drawing your controls programmatically instead of using images; a really cool thing would be to cache the programmatic drawings so that they only have to be performed once.
Best of luck!
I want build a sketch pad app on iPhone, I assume that this type app has already been developed long time , maybe some open source code can be use for this purpose ?
anyone can give tip on this field ?
Thanks ...
Take a look at the Sketch example for MacOS X Cocoa, then at UIBezierPath. Much of the drawing code should be easily portable with a regexp, although the UI and controller would need rewriting.
Duplicate:
How can i use picker view in iphone application using cocos2d ?
Hello everyone i am working on iphone gaming project.In this game i want spin some image (like reel spin).But i can not do this.Can i use picker view in this application using cocos2d.If can then give some instruction how can i do that or any different solution for this project.
You can use anything your want. I am constantly amused by the number of people who think that Cocos2d is some sort of world that you enter where you cannot bring any of your old friends. Cocos2d is just a library that makes OpenGL easy for games, and that is all it is. All it is.
I think you might benefit from trying a few easier projects first. I have made the mistake of trying to jump into something beyond my understanding, and while in the end it may have been beneficial, I sometimes wish I had learned in a more systematic manner.