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The image registration point
On at JavaScript canvas the registration point is the top left corner. So in hit detection you have to calculate the x-position, the image width and height. In layout you should be able to figure out where to plage the images, and illustrations. Y = “up / down” X = “left / right” ( I […]
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The X and the Y axis
On the HTML canvas the top left corner is x = 0 and y = 0. The y-axis is “up & down”. The x-axis is “left & right”.
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Filled Circle Canvas
Turotial demonstrating a filled circle. Sample by Eric Rowell @ HTML5 Canvas tutorials: