HarmonyOS 应用开发之@AnimatableExtend装饰器：定义可动画属性(1)

作者：花生_TL007 | 2024-05-01 20:11:44

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正文

.padding(10)
}
}

以下示例实现折线的动画效果。

class Point {
x: number
y: number

constructor(x: number, y: number) {
this.x = x
this.y = y
}
plus(rhs: Point): Point {
return new Point(this.x + rhs.x, this.y + rhs.y)
}
subtract(rhs: Point): Point {
return new Point(this.x - rhs.x, this.y - rhs.y)
}
multiply(scale: number): Point {
return new Point(this.x * scale, this.y * scale)
}
equals(rhs: Point): boolean {
return this.x === rhs.x && this.y === rhs.y
}
}

class PointVector extends Array implements AnimatableArithmetic {
constructor(value: Array) {
super();
value.forEach(p => this.push§)
}
plus(rhs: PointVector): PointVector {
let result = new PointVector([])
const len = Math.min(this.length, rhs.length)
for (let i = 0; i < len; i++) {
result.push((this as Array)[i].plus((rhs as Array)[i]))
}
return result
}
subtract(rhs: PointVector): PointVector {
let result = new PointVector([])
const len = Math.min(this.length, rhs.length)
for (let i = 0; i < len; i++) {
result.push((this as Array)[i].subtract((rhs as Array)[i]))
}
return result
}
multiply(scale: number): PointVector {
let result = new PointVector([])
for (let i = 0; i < this.length; i++) {
result.push((this as Array)[i].multiply(scale))
}
return result
}
equals(rhs: PointVector): boolean {
if (this.length != rhs.length) {
return false
}
for (let i = 0; i < this.length; i++) {
if (!(this as Array)[i].equals((rhs as Array)[i])) {
return false
}
}
return true
}
get(): Array<Object[]> {
let result: Array<Object[]> = []
this.forEach(p => result.push([p.x, p.y]))
return result
}
}

@AnimatableExtend(Polyline) function animatablePoints(points: PointVector) {
.points(points.get())
}

@Entry
@Component
struct AnimatablePropertyExample {
@State points: PointVector = new PointVector([
new Point(50, Math.random() * 200),
new Point(100, Math.random() * 200),
new Point(150, Math.random() * 200),
new Point(200, Math.random() * 200),
new Point(250, Math.random() * 200),
])
build() {
Column() {
Polyline()
.animatablePoints(this.points)
.animation({duration: 1000, curve: “ease”})
.size({height:220, width:300})
.fill(Color.Green)
.stroke(Color.Red)
.backgroundColor(‘#eeaacc’)
Button(“Play”)
.onClick(() => {
this.points = new PointVector([
new Point(50, Math.random() * 200),
new Point(100, Math.random() * 200),
new Point(150, Math.random() * 200),
new Point(200, Math.random() * 200),
new Point(250, Math.random() * 200),
])
})
}.width(“100%”)
.padding(10)
}
}