- #Zoom math 500 manual how to
- #Zoom math 500 manual manual
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I've got the zoom to mouse cursor bit working fine, still trying to figure out how to allow the user to drag the canvas around like you can do in Google Maps. I'm in the middle of building a jQuery plugin that does this (Google Maps style zoom using CSS3 Transforms). I asked a similar question on Stackoverflow but got no response, but posted in DocType (StackOverflow for HTML/CSS) and got a response. This is actually a very difficult problem (mathematically), and I'm working on the same thing almost.
#Zoom math 500 manual code
The remaining code then needs to apply the scaling and translate to the draw context so it's origin coincides with the canvas corner. Originy -= mousey/(scale*zoom) - mousey/scale originx -= mousex/(scale*zoom) - mousex/scale Therefore we need to shift the origin (coordinates of the corner) to account for this. Originally the mouse is at a distance mouse/scale from the corner, we want the point under the mouse to remain in the same place after the zoom, but this is at mouse/new_scale away from the corner. The key, as pointed out, is to compute the axis position such that the zoom point (mouse pointer) remains in the same place after the zoom. Normalize mouse wheel movement to +1 or -1 to avoid unusual jumps. Schedule the redraw for the next display refresh.Ĭonst mousex = event.clientX - canvas.offsetLeft Ĭonst mousey = event.clientY - canvas.offsetTop
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#Zoom math 500 manual free
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#Zoom math 500 manual manual
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