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render.js
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render.js
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import {state, config} from './app.js';
var canvas = document.getElementById("screen")
function renderFunction(f) {
if(!f.cache || !f.cache.points) {
return
}
let xInterval = state.xInterval;
let yInterval = state.yInterval;
let windowWidth = config.width;
let windowHeight = config.height;
let scale = state.scale
let ctx = canvas.getContext("2d")
let points = f.cache.points
ctx.strokeStyle = f.color
ctx.lineWidth = 3
ctx.beginPath();
for(let i=0; i<points.length; i++) {
if(points[i] === null) {
ctx.stroke()
ctx.beginPath()
continue
}
let x = (points[i].point[0]-xInterval)*scale
let y = (points[i].point[1]-yInterval)*scale
y = Math.min(Math.max(y, -100), 2*windowHeight)
if(!points[i].asymptote) {
ctx.lineTo(x, y)
}
else {
ctx.lineTo(x, y)
ctx.lineTo(x, points[i].asymptote>0 ? -100 : 2*windowHeight)
ctx.moveTo(x, y)
}
}
ctx.stroke()
}
export {renderFunction}