Modifying ofEasyCam to pan/zoom a 2D map

@clayh wrote:

I've decided to use openFrameworks to do some modeling and visualization of traffic data (for a project at work). Here's an initial look at what I'm dealing with -- the city of Pasadena, CA, drawn as 14k+ "links" on their road network (never mind the color and stroke weight...):

Screen Shot 2015-11-13 at 9.43.37 AM.png2272x1804 136 KB

I'd like to be able to pan and zoom the map. It seems like ofEasyCam would be the easiest way to do this. However, I'd like to avoid stuff like this:

Screen Shot 2015-11-13 at 9.47.50 AM.png2272x1804 114 KB

What I want to do is:

• mouse drags only pan on the x & y axes.
• zoom in and out (at a controlled rate) by holding down ↑ and ↓
• never rotate the camera off of the current project plane

How do I go about modifying ofEasyCam to bind that behavior to the mouse and those keys?

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