VUE使用canvas画板实现签字
不多说了，直接上代码。
<template>
<div id="signatureBox" @touchmove.prevent>
<canvas id="canvas" width="350" height="625">Canvas画板</canvas>
<p class="miaosu">请签字</p>
<i class="mt-a" @click="clear">×</i>
<i class="mt-b" @click="save">√</i>
<!-- <i class="sendbtn" @click="fanhui">返回</i> -->
</div>
</template>
<script>
var draw;
var preHandler = function(e) {
e.preventDefault();
};
class Draw {
constructor(el) {
this.el = el;
this.canvas = document.getElementById(this.el);
this.cxt = this.canvas.getContext("2d");
this.stage_info = canvas.getBoundingClientRect();
}
init(btn) {
var that = this;
this.canvas.addEventListener("touchstart", function(event) {
document.addEventListener("touchstart", preHandler, false);
that.drawBegin(event);
});
this.canvas.addEventListener("touchend", function(event) {
document.addEventListener("touchend", preHandler, false);
that.drawEnd();
});
this.clear(btn);
}
//点击触发
drawBegin(e) {
var that = this;
this.cxt.strokeStyle = "#000";
this.cxt.beginPath();
this.cxt.moveTo(e.changedTouches[0].clientX, e.changedTouches[0].clientY);
canvas.addEventListener("touchmove", function() {
that.drawing(event);
});
}
///滑动
drawing(e) {
this.cxt.lineTo(e.changedTouches[0].clientX, e.changedTouches[0].clientY);
this.cxt.stroke();
}
drawEnd() {
document.removeEventListener("touchstart", preHandler, false);
document.removeEventListener("touchend", preHandler, false);
document.removeEventListener("touchmove", preHandler, false);
}
clear() {
this.cxt.clearRect(0, 0, 350, 625);
}
save() {
return canvas.toDataURL("image/png");
}
}
export default {
data() {
return {
url: ""
};
},
mounted() {
draw = new Draw("canvas");
draw.init();
},
created() {},
methods: {
//返回上一页
// toback() {
// this.$router.go(-1);
// },
clear: function() {
draw.clear();
},
save: function() {
this.$emit("signatureFn", { sta: 1, img: draw.save() });
},
fanhui() {
this.$emit("signatureFn", { sta: 0, img: "" });
}
}
};
</script>
<style >
#signatureBox .sendbtn {
height: 0.64rem;
line-height: 0.64rem;
font-size: 0.23rem;
/* transform: rotate(90deg); */
}
#signatureBox .mt {
margin: 0.5rem 0 0.5rem 0.35rem;
}
</style>
<style scoped>
* {
touch-action: pan-y;
}
#signatureBox {
position: fixed;
top: 0;
left: 0;
width: 7.5rem;
height: 100%;
z-index: 9999;
background: #f2f3f7;
}
#canvas {
display: block;
margin: 0 auto;
background: #fff;
cursor: default;
width: 7.5rem;
}
#keyword-box {
margin: 10px 0;
}
.miaosu {
position: absolute;
top: 3.7rem;
left: 2.1rem;
transform: rotate(90deg);
color: #ccc;
opacity: 0.25;
pointer-events: none;
}
.mt {
margin: 0.8rem 0 1rem 0.35rem;
width: 3.2rem;
display: inline-block;
vertical-align: top;
}
.mt-a{
margin: 0.8rem 0 1rem 0.35rem;
font-size: 40px;
transform: rotate(90deg);
font-family:宋体;
/* margin: 0rem 0rem 1rem 0rem; */
position: absolute;
margin-left:8%;
bottom:2%;
display: inline-block;
vertical-align: top;
}
.mt-b{
margin: 0.8rem 0 1rem 0.35rem;
font-size: 38px;
position: absolute;
margin-left:85%;
bottom:2%;
font-family:宋体;
transform: rotate(90deg);
display: inline-block;
/* vertical-align: top; */
}
</style>
