<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title></title>
<style type="text/css">
html,
body,
canvas {
padding: 0;
margin: 0;
width: 100%;
height: 100%;
overflow-y: hidden;
background-color: transparent;
}
</style>
</head>
<body>
<canvas id="lime-signature"></canvas>
<script type="text/javascript" src="./uni.webview.1.5.3.js"></script>
<script type="text/javascript" src="./signature.js"></script>
<script>
var signature = null;
var timer = null;
var isStart = false;
var options = null
console.log = function(...args) {
postMessage(args);
};
// function stringify(key, value) {
// if (typeof value === 'object' && value !== null) {
// if (cache.indexOf(value) !== -1) {
// return;
// }
// cache.push(value);
// }
// return value;
// };
function emit(event, data) {
postMessage({
event,
data: typeof data !== "object" && data !== null ? data : JSON.stringify(data),
});
// cache = [];
}
function postMessage(data) {
uni.postMessage({
data
});
}
function update(v = {}) {
if (signature) {
options = v
signature.pen.setOption(v);
} else {
signature = new Signature.Signature({el: "lime-signature"});
canvasEl = signature.canvas.get("el");
options = v
signature.pen.setOption(v)
const width = signature.canvas.get("width");
const height = signature.canvas.get("height");
emit({changeSize: {width,height}})
}
}
function clear() {
signature.clear()
}
function undo() {
signature.undo()
}
function isEmpty() {
const isEmpty = signature.isEmpty()
emit({isEmpty});
}
function save(args) {
// delete args.success;
// delete args.fail;
clearTimeout(timer);
timer = setTimeout(() => {
let path = canvasEl.toDataURL()
const {backgroundColor, landscape} = options
if(backgroundColor || landscape) {
const canvas = document.createElement('canvas')
const width = this.signature.canvas.get('width')
const height = this.signature.canvas.get('height')
const pixelRatio = this.signature.canvas.get('pixelRatio')
const size = [width, height]
if(landscape) {size.reverse()}
canvas.width = size[0] * pixelRatio
canvas.height = size[1] * pixelRatio
const context = canvas.getContext('2d')
context.scale(pixelRatio, pixelRatio)
if (landscape) {
context.translate(0, width)
context.rotate(-Math.PI / 2)
}
if (backgroundColor) {
context.fillStyle = backgroundColor
context.fillRect(0, 0, width, height)
}
context.drawImage(this.signature.canvas.get('el'), 0, 0, width, height)
path = canvas.toDataURL()
canvas.remove()
}
if (typeof path == "string") {
const index = Math.ceil(path.length / 8);
for (var i = 0; i < 8; i++) {
if (i == 7) {
emit({"success": path.substr(i * index, index)});
} else {
emit({"file": path.substr(i * index, index)});
}
}
} else {
console.error("canvas no data");
emit({"fail": "canvas no data"});
}
}, 30);
}
</script>
</body>
</html>