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I’m making a simple JavaScript graphing library using the canvas element. I really suck at math so I’m stuck with a simple issue.
If I have a number – for example 30000, and I want to plot it relatively to graph’s height which is 400. How do I calculate the y value for that?
You would want to figure out your max for the graph. Say, in this case 50000. Then, take your height and divide it by the max (so 400/50000) to get a ratio multiplier. Any number you want to plot you multiply by that ratio and that should give you a number that fits on your space. Is that what you’re asking for?