function drawLine() {
    var a = prevX,
        b = prevY,
        c = currX,
        d = currY;

    context.fillStyle = getColor();
    context.strokeStyle = color;
    context.lineWidth = lineWidth;
    context.lineCap = "round";

    context.beginPath();
    context.moveTo(a, b);
    context.lineTo(c, d);
    context.stroke();
    context.closePath();
}