vue移动端实现横屏手写签名
时间: 2023-09-01 17:06:59 浏览: 103
要在Vue移动端实现横屏手写签名功能,可以使用HTML5的canvas元素和JavaScript来实现。首先,你需要创建一个canvas元素,并设置其宽高比,以便在横屏模式下正确显示。然后,你需要监听设备方向变化事件,根据设备方向动态调整canvas元素的宽高比,以便在横屏模式下正确显示。最后,你需要监听用户手写事件,并在canvas元素上绘制用户手写的签名。
以下是示例代码,可以在移动设备上测试:
```html
<template>
<div class="canvas-container">
<canvas ref="canvas"></canvas>
</div>
</template>
<script>
export default {
mounted() {
// 监听设备方向变化事件
window.addEventListener("orientationchange", this.onOrientationChange);
// 初始化canvas
this.initCanvas();
},
methods: {
initCanvas() {
const canvas = this.$refs.canvas;
const ctx = canvas.getContext("2d");
// 设置canvas宽高比为3:2
canvas.width = 300;
canvas.height = 200;
// 监听用户手写事件
canvas.addEventListener("touchstart", this.onTouchStart);
canvas.addEventListener("touchmove", this.onTouchMove);
canvas.addEventListener("touchend", this.onTouchEnd);
},
onOrientationChange() {
const canvas = this.$refs.canvas;
const ctx = canvas.getContext("2d");
// 根据设备方向动态调整canvas宽高比
if (window.orientation === 90 || window.orientation === -90) {
canvas.width = 200;
canvas.height = 300;
} else {
canvas.width = 300;
canvas.height = 200;
}
// 清空canvas
ctx.clearRect(0, 0, canvas.width, canvas.height);
},
onTouchStart(event) {
const canvas = this.$refs.canvas;
const ctx = canvas.getContext("2d");
// 开始绘制路径
ctx.beginPath();
// 获取触点位置
const touch = event.touches[0];
const x = touch.pageX - canvas.offsetLeft;
const y = touch.pageY - canvas.offsetTop;
// 移动到触点位置
ctx.moveTo(x, y);
},
onTouchMove(event) {
const canvas = this.$refs.canvas;
const ctx = canvas.getContext("2d");
// 获取触点位置
const touch = event.touches[0];
const x = touch.pageX - canvas.offsetLeft;
const y = touch.pageY - canvas.offsetTop;
// 绘制直线到触点位置
ctx.lineTo(x, y);
ctx.stroke();
},
onTouchEnd() {
const canvas = this.$refs.canvas;
const ctx = canvas.getContext("2d");
// 结束路径绘制
ctx.closePath();
}
},
beforeDestroy() {
// 移除事件监听
window.removeEventListener("orientationchange", this.onOrientationChange);
const canvas = this.$refs.canvas;
canvas.removeEventListener("touchstart", this.onTouchStart);
canvas.removeEventListener("touchmove", this.onTouchMove);
canvas.removeEventListener("touchend", this.onTouchEnd);
}
};
</script>
<style scoped>
.canvas-container {
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
}
canvas {
border: 1px solid #ccc;
}
</style>
```
在上面的示例中,我们创建了一个canvas元素,并设置了其宽高比为3:2,以便在竖屏模式下正确显示。我们还监听了设备方向变化事件,根据设备方向动态调整canvas元素的宽高比。我们还监听了用户手写事件,并在canvas元素上绘制用户手写的签名。当用户完成签名后,可以将canvas元素上的图像数据保存到服务器或本地存储中。