tinyHeart/js/commonFunctions.js

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window.requestAnimFrame = (function() {
	return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
		function( /* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
			return window.setTimeout(callback, 1000 / 60);
		};
})();


function calLength2(x1, y1, x2, y2) {
	return Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2);
}


function randomColor() {
	var col = [0, 1, 2];
	col[0] = Math.random() * 100 + 155;
	col[0] = col[0].toFixed();
	col[1] = Math.random() * 100 + 155;
	col[1] = col[1].toFixed();
	col[2] = Math.random() * 100 + 155;
	col[2] = col[2].toFixed();
	var num = Math.floor(Math.random() * 3);
	col[num] = 0;
	return "rgba(" + col[0] + "," + col[1] + "," + col[2] + ",";
}


function lerpAngle(a, b, t) {
	var d = b - a;
	if (d > Math.PI) d = d - 2 * Math.PI;
	if (d < -Math.PI) d = d + 2 * Math.PI;
	return a + d * t;
}

function lerpDistance(aim, cur, ratio) {
	
	var delta = cur - aim;

	return aim + delta * ratio;
}

function inOboundary(arrX, arrY, l, r, t, b) { //在l r t b范围内的检测
	return arrX > l && arrX < r && arrY > t && arrY < b;
}

function rgbColor(r, g, b) {
	r = Math.round(r * 256);
	g = Math.round(g * 256);
	b = Math.round(b * 256);
	return "rgba(" + r + "," + g + "," + b + ",1)";
}

function rgbNum(r, g, b) {
	r = Math.round(r * 256);
	g = Math.round(g * 256);
	b = Math.round(b * 256);
	return "rgba(" + r + "," + g + "," + b;
}

function rnd(m) {