目标:我正在使用React Leaflet构建游戏地图,我正在使用ImageOverlay放置游戏区块,问题是传单不允许您旋转棋子。我需要能够将ImageOverlay旋转一定程度。
我尝试过:我正在使用ImageOverlay创建地图,因为这些部分是按中心坐标放置的PNG文件。然后旋转的那个我给了一个名为'rotate'的类。然后在'componentDidMount'上我尝试使用'ReactDOM.findDOMNode(this).getElementsByClassName('rotate $ {degree}')'找到具有该类名的元素,但这对React组件不起作用?
componentDidMount() {
// Below code returns empty arrays
let elementsRotated90 = ReactDOM.findDOMNode(this).getElementsByClassName("rotate90");
let elementsRotated180 = ReactDOM.findDOMNode(this).getElementsByClassName("rotate180");
let elementsRotated270 = ReactDOM.findDOMNode(this).getElementsByClassName("rotate270");
}
render() {
let position = [this.state.lat, this.state.long];
return (
<Map className="map" center={position} zoom={this.state.zoom}>
<LayerGroup>
{map1
.data
.Pieces
.Stages
.map(stage => {
return stage
.Tiles
.map(tile => {
let height = tile.Resolution.Height;
let width = tile.Resolution.Width;
let url = require('./assets/pieces/' + tile.Type + '.png');
let rotation = tile.Rotation;
let center = tile.CenterCoord;
let bound = ([
[
center[1] - height / 2,
center[0] - width / 2
],
[
center[1] + height / 2,
center[0] + width / 2
]
]);
let component = <ImageOverlay bounds={bound} url={url}
className={`rotate${rotation}`}/>
this.state.markers.push(component);
return component;
})
})}
</LayerGroup>
</Map>
)
}
如果有人比我尝试过的想法更好,请告诉我。谢谢!
要旋转ImageOverlay
component,可以考虑以下方法:
1)通过L.ImageOverlay
instance获取ref
attribute:
const { leafletElement: imageOverlay } = this.imageOverlayRef.current;
哪里
<ImageOverlay
ref={this.imageOverlayRef}
...
/>
2)获取Image
元素并应用rotateZ()
CSS function:
const image = imageOverlay.getElement()
this.rotateImage(image, this.rotateAngle);
哪里
rotateImage(image, angle) {
if (!this.originalTransformValue) {
this.originalTransformValue = image.style.transform;
}
image.style.transform = `${this.originalTransformValue} rotateZ(${angle}deg)`;
}
Here is a demo供您参考