While designing Touch Charts, we took into account that mobile has two devices types: phones and tablets and two orientations: portrait and landscape. Also by changing the underlying drawing system from the SVG/VML in Ext JS 4, we were able to get all the basics of the higher level charting system in place incredibly quickly and then focus on delivering the mobile specific experience. We were able to leverage Canvas’ drop shadow capabilities that are hardware accelerated on many browsers. Out of the gate that gave us some great benefits. In order to get to that high-performance native feel, we implemented an HTML5 Canvas engine in the core drawing system. We wanted to come as close to a native experience as possible using HTML5. Second, it had to be mobile-friendly and feel fast. First, it had to work on all platforms that Sencha Touch supported, including Android 2+, iOS, and BlackBerry OS6. When we started to think mobile for Charts, we had a few key requirements. With Touch Charts we took the core drawing and charting system from Ext JS 4 and made it come alive. When we released the new drawing packing in Ext JS 4, we took browser drawing and packaging to a whole new level.
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