Orbit – Pan – Zoom

Since this will be web-based application, the input I must take into accout is mouse and keyboard. I see that SketchUp-style for Orbit-Pan-Zoom interface is still the best. So, based on that I create mouse-centered UI which allow user to only using mouse movement with minimum keyboard stroke. Orbit – pan – zoom is one the foundation of camera control in my application. Of course I am aware of those in Google Earth. I made two basic camera controls : Bird eye ad Human Eye (FPS-style). Bird eye provide overview of my entire site with OPZ control, and human eye basically the same as
First Person Shooter-type of control

However, Pan-technique still makes me headache. Is it something with screenCoordinate?

Oh no…

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