vue+canvas实现移动端手写签名

2020-06-16 06:59:27易采站长站整理

this.points.push(obj)
}
},
touchMove(ev) {
ev = ev || event
ev.preventDefault()
if (ev.touches.length == 1) {
let obj = {
x: ev.targetTouches[0].clientX - this.stageInfo.left,
y: ev.targetTouches[0].clientY - this.stageInfo.top
}
this.moveY = obj.y
this.moveX = obj.x
this.canvasTxt.beginPath()
this.canvasTxt.moveTo(this.startX, this.startY)
this.canvasTxt.lineTo(obj.x, obj.y)
this.canvasTxt.stroke()
this.canvasTxt.closePath()
this.startY = obj.y
this.startX = obj.x
this.points.push(obj)
}
},
touchEnd(ev) {
ev = ev || event
ev.preventDefault()
if (ev.touches.length == 1) {
let obj = {
x: ev.targetTouches[0].clientX - this.stageInfo.left,
y: ev.targetTouches[0].clientY - this.stageInfo.top
}
this.canvasTxt.beginPath()
this.canvasTxt.moveTo(this.startX, this.startY)
this.canvasTxt.lineTo(obj.x, obj.y)
this.canvasTxt.stroke()
this.canvasTxt.closePath()
this.points.push(obj)
}
},
//pc
mouseDown(ev) {
ev = ev || event
ev.preventDefault()
if (1) {
let obj = {
x: ev.offsetX,
y: ev.offsetY
}
this.startX = obj.x
this.startY = obj.y
this.canvasTxt.beginPath()
this.canvasTxt.moveTo(this.startX, this.startY)
this.canvasTxt.lineTo(obj.x, obj.y)
this.canvasTxt.stroke()

// this.canvasTxt.strokeRect(20,20,80,100);
this.canvasTxt.closePath()
this.points.push(obj)
this.isDown = true
}
},
mouseMove(ev) {
ev = ev || event
ev.preventDefault()
if (this.isDown) {
let obj = {
x: ev.offsetX,
y: ev.offsetY
}
this.moveY = obj.y
this.moveX = obj.x
this.canvasTxt.beginPath()
this.canvasTxt.moveTo(this.startX, this.startY)
this.canvasTxt.lineTo(obj.x, obj.y)
this.canvasTxt.stroke()
this.canvasTxt.closePath()
this.startY = obj.y
this.startX = obj.x
this.points.push(obj)
}
},
mouseUp(ev) {
ev = ev || event
ev.preventDefault()
if (1) {
let obj = {
x: ev.offsetX,
y: ev.offsetY
}
this.canvasTxt.beginPath()
this.canvasTxt.moveTo(this.startX, this.startY)
this.canvasTxt.lineTo(obj.x, obj.y)
this.canvasTxt.stroke()
this.canvasTxt.closePath()
this.points.push(obj)
this.points.push({x: -1, y: -1})
this.isDown = false
}
},
//重写
overwrite() {
this.canvasTxt.clearRect(0, 0, this.$refs.canvasF.width, this.$refs.canvasF.height)