Rendering on iOS about vivagraphjs HOT 3 CLOSED

Interesting. Have you tried setting clearColor and clearColorValue in webgl graphics?

 var graphics = Viva.Graph.View.webglGraphics({
    clearColor: true,
    clearColorValue: { r: 0, g: 0, b: 0, a: 1 }
  });

These values are used here and from what you picture looks like I'm guessing the webgl renderer needs to clear the surface.

PS: Is this Safari for iOS?

from vivagraphjs.

Yes safari for iOS.

Thanks a lot, that worked :) Interesting that it doesn't need that on the desktop (Chrome or Safari).
Do you have any experience with using touch-events with vivagraph.js?

Cheers

from vivagraphjs.

Glad to hear it fixed the problem!

I tried to implement touch events once, but something stopped me, don't remember what. If you'd like to try, here is how input works.

The renderer class is responsible for input processing. It's lame, and I should have made it into a separate input processing system, but when I just started the library it didn't sound as a bad idea. Anyways, the renderer differentiates when user drags a node and drags a canvas (container with nodes). Handling container events is simple. The container is always a DOM element, and the renderer leverages browser's input events via the dragndrop class. But handling nodes events is different - in case of WebGL there is no help from the browser at all, thus I made a new abstraction in the library, called inputmanager. The input manager is provided by specific graphics object (CSS, SVG or WebGL) and serves as an interface, to let renderer handle nodes events. In case of CSS and SVG graphics, I'm reusing mentioned above dragndrop class. In WebGL I manually track mouse events from entire canvas, translate their coordinates into the graph space, and then perform a node lookup (which is now implemented as a linear search function, but this was never a performance bottleneck of the library).

To summarize. If you want to implement touch events you would need to update dragndrop class and webglInputEvents class.

Cheers,
Andrei

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