1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
| <template>
<div class="container">
<div class="title">
<span>请手写输入您的签名</span>
<div v-on:click="handleReset" class="reset">重置</div>
</div>
<canvas
id="canvas"
width="570"
height="240"
v-on:mousedown="handleMouseDown"
v-on:mouseup="handleMouseUp"
v-on:mousemove="handleMouseMove"
v-on:touchstart="handleTouchStart"
v-on:touchmove="handleTouchMove"
v-on:touchend="handleTouchEnd"
>抱歉，您的浏览器不支持电子签名，请更换或升级当前浏览器后重试！</canvas>
</div>
</template>
<script>
export default {
name: 'Signature',
props: {
onSign: {
type: Function,
default: () => {},
},
onSaveImage: {
type: Function,
default: () => {},
},
},
data() {
return {
mouse: {
current: {
x: 0,
y: 0,
},
down: false,
},
};
},
computed: {
currentMouse() {
const c = document.getElementById('canvas');
const rect = c.getBoundingClientRect();
return {
x: this.mouse.current.x - rect.left,
y: this.mouse.current.y - rect.top,
};
},
},
methods: {
draw() {
if (this.mouse.down) {
const c = document.getElementById('canvas');
const ctx = c.getContext('2d');
ctx.clearRect(0, 0, c.width, c.height);
ctx.lineTo(this.currentMouse.x, this.currentMouse.y);
// 颜色
ctx.strokeStyle = '#000';
// 宽度
ctx.lineWidth = 2;
ctx.stroke();
}
},
handleMouseDown(event) {
this.mouse.down = true;
this.mouse.current = {
x: event.pageX,
y: event.pageY,
};
const c = document.getElementById('canvas');
const ctx = c.getContext('2d');
ctx.moveTo(this.currentMouse.x, this.currentMouse.y);
},
handleMouseUp() {
this.mouse.down = false;
},
handleMouseMove(event) {
this.mouse.current = {
x: event.pageX,
y: event.pageY,
};
this.draw(event);
},
handleTouchStart(event) {
const canvas = document.getElementById('canvas');
const touch = event.touches[0];
const me = new MouseEvent('mousedown', {
clientX: touch.clientX,
clientY: touch.clientY,
});
canvas.dispatchEvent(me);
},
handleTouchMove(event) {
const canvas = document.getElementById('canvas');
const touch = event.touches[0];
const me = new MouseEvent('mousemove', {
clientX: touch.clientX,
clientY: touch.clientY,
});
canvas.dispatchEvent(me);
},
handleTouchEnd() {
const canvas = document.getElementById('canvas');
const me = new MouseEvent('mouseup', {});
canvas.dispatchEvent(me);
},
handleDownload() {
const canvasElement = document.getElementById('canvas');
const MIME_TYPE = 'image/png';
const imgURL = canvasElement.toDataURL(MIME_TYPE);
// 创建a标签模拟点击触发浏览器下载机制
const dlLink = document.createElement('a');
dlLink.download = +new Date();
dlLink.href = imgURL;
dlLink.dataset.downloadurl = [MIME_TYPE, dlLink.download, dlLink.href].join(':');
document.body.appendChild(dlLink);
dlLink.click();
document.body.removeChild(dlLink);
},
handleReset() {
const canvas = document.getElementById('canvas');
// 重置canvas画布
canvas.width = canvas.width;
canvas.height = canvas.height;
this.mouse.current = {
x: 0,
y: 0,
};
},
},
mounted() {
const c = document.getElementById('canvas');
const ctx = c.getContext('2d');
ctx.translate(0.5, 0.5);
ctx.imageSmoothingEnabled = false;
this.draw();
},
};
</script>
<style scoped lang="less">
.container {
border: 0.01rem solid #E4E4E4;
background: #fff;
border-radius: .04rem;
padding: .3rem;
.title {
display: flex;
justify-content: space-between;
align-items: center;
.reset {
width: 1.26rem;
height: 0.6rem;
line-height: 0.6rem;
text-align: center;
border: 0.01rem solid #F8875F;
color: #F8875F;
border-radius: 0.04rem;
}
}
}
</style>
|