Hi all,
Here is the example we looked at with a vector of bouncing ball objects.
To try it out, download and unzip the repo. Then, move the “ball_bounce_demo” folder into your Openframeworks “myApps” folder and open the xcode project file( ball_bounce_demo.xcodeproj).
Here’s the presentation that we used to guide us through the workshop.
If you need more help, please don’t hesitate to come for office hours with Lia, Genevieve, Nick or Merche!
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addendum (Lia):
There was a question about when to use or not use the “new” operator when creating new objects in C++. I didn’t answer it very well (and probably still won’t), but it has to do with memory management. In Processing, we make a new object like so, where we always use the “new” operator:
myClass x = new myClass();
in C++, there are two ways to make a new class, and which way you choose depends on if you want to allocate memory from the heap or the stack.
// on the stack
myClass x;
// or on the heap ... see the pointer??
myClass *x = new myClass;
If you’re using the stack (no pointer), you access member variables and functions like so:
x.myVariable;
if you’re using the heap (pointer), you would use this:
x->myVariable;
We don’t want to get too much into it at this point, but if you want to read more about Heaps and Stacks, try this link. . Here is Jeff Crouse’s tutorial on C++ constructors. tldr: unless your object is large, or you need to use it beyond local scope, use the stack (no pointers) way.