To ensure the color and pointer remain constant:
if (d > radiusSquared) {
currentX = radius * math.cos(theta);
currentY = radius * math.sin(theta);
theta = atan2(currentY, currentX);
d = currentX * currentX + currentY * currentY;
}else{
label.textContent = b.style.background = hsvToRgb(
(theta + PI) / PI2,
sqrt(d) / radius,
input.value / oneHundred
)[3];
a.putImageData(imageData, 0, 0);
dragger.style.left = (~~currentX + radiusPlusOffset) + 'px';
dragger.style.top = (~~currentY + radiusPlusOffset) + 'px';
}
Regarding the cursor, one solution is to capture mouseover events on the canvas and manually adjust the cursor position.
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