Function drawAxes

polynomial-regression/index.js:27–41

(canvas)

}
// Draw x and y axes in the canvas.
function drawAxes(canvas) {
  const ctx = canvas.getContext('2d');
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  ctx.beginPath();
  const leftCoord = world2canvas(canvas, -canvas.width / 2, 0);
  const rightCoord = world2canvas(canvas, canvas.width / 2, 0);
  ctx.moveTo(leftCoord[0], leftCoord[1]);
  ctx.lineTo(rightCoord[0], rightCoord[1]);
  ctx.stroke();
  const topCoord = world2canvas(canvas, 0, canvas.height / 2);
  const bottomCoord = world2canvas(canvas, 0, -canvas.height / 2);
  ctx.moveTo(topCoord[0], topCoord[1]);
  ctx.lineTo(bottomCoord[0], bottomCoord[1]);
  ctx.stroke();
}

// Draw x and y data in the canvas.
//