Installation

npm install gradient-alpha --save

<script src="js/gradient-alpha.js"></script>

gradient

Features

generate ImageData or Canvas from Image or ImageData by alpha options; 生成新的渐变透明度图片或ImageData.

Methonds

linear:

 gradient.linear< T extends HTMLImageElement|ImageData>(img:T, angel: number = 90, stops: number[] | Array<[number, number | string]> = [0, 1],alphas?:number[]):T

img - ImageData|HTMLImageElement;

angel - number;gradient direction,range:[0,360];

stops - [[number,number|string]...];alpha sections;like [[0,"0"],[1:"100%"]];frist param is alpha,second param is length(range[0,1] or range["0","100%"]);

example:

gradient.linear(new Image(),45,[[0,"0"],[0.3,"50%"],[1,"100%"]])