Function updateSpeedFromEvent

js/script.js:1200–1213

(event)

let autoLaunchTime = 0;

function updateSpeedFromEvent(event) {
	if (isUpdatingSpeed || event.y >= mainStage.height - 44) {
		// On phones it's hard to hit the edge pixels in order to set speed at 0 or 1, so some padding is provided to make that easier.
		const edge = 16;
		const newSpeed = (event.x - edge) / (mainStage.width - edge * 2);
		simSpeed = Math.min(Math.max(newSpeed, 0), 1);
		// show speed bar after an update
		speedBarOpacity = 1;
		// If we updated the speed, return true
		return true;
	}
	// Return false if the speed wasn't updated
	return false;
}

// Extracted function to keep `update()` optimized
function updateGlobals(timeStep, lag) {