在React Konva中实现Transformer矩形的dragBoundFunc和boundBoxFunc,可以通过以下步骤完成:
以下是一个示例代码,演示了如何在React Konva中实现Transformer矩形的dragBoundFunc和boundBoxFunc:
import React from 'react';
import { Stage, Layer, Rect, Transformer } from 'react-konva';
const App = () => {
const [rectProps, setRectProps] = React.useState({
x: 100,
y: 100,
width: 200,
height: 100,
});
const handleDragEnd = (e) => {
setRectProps({
...rectProps,
x: e.target.x(),
y: e.target.y(),
});
};
const handleTransformEnd = (e) => {
const node = e.target;
const scaleX = node.scaleX();
const scaleY = node.scaleY();
// Limit the minimum and maximum width and height
const minWidth = 50;
const maxWidth = 500;
const minHeight = 50;
const maxHeight = 300;
const width = Math.max(minWidth, Math.min(maxWidth, node.width() * scaleX));
const height = Math.max(minHeight, Math.min(maxHeight, node.height() * scaleY));
setRectProps({
...rectProps,
width,
height,
scaleX: 1,
scaleY: 1,
});
};
const handleDragBoundFunc = (pos) => {
const stage = pos.target.getStage();
const { width, height } = stage.size();
// Limit the drag movement within the stage
const x = Math.max(0, Math.min(width - rectProps.width, pos.x));
const y = Math.max(0, Math.min(height - rectProps.height, pos.y));
return { x, y };
};
return (
<Stage width={window.innerWidth} height={window.innerHeight}>
<Layer>
<Rect
{...rectProps}
draggable
onDragEnd={handleDragEnd}
onTransformEnd={handleTransformEnd}
/>
<Transformer
boundBoxFunc={(oldBox, newBox) => {
// Limit the minimum and maximum width and height during transformation
const minWidth = 50;
const maxWidth = 500;
const minHeight = 50;
const maxHeight = 300;
const width = Math.max(minWidth, Math.min(maxWidth, newBox.width));
const height = Math.max(minHeight, Math.min(maxHeight, newBox.height));
return { ...newBox, width, height };
}}
dragBoundFunc={handleDragBoundFunc}
/>
</Layer>
</Stage>
);
};
export default App;
这个示例代码中,我们创建了一个可拖动和可变换大小的矩形,并使用Transformer组件来实现变换功能。通过设置dragBoundFunc和boundBoxFunc,我们限制了矩形的拖动范围和变换范围。
请注意,这只是一个简单的示例,你可以根据实际需求进行修改和扩展。另外,腾讯云相关产品和产品介绍链接地址可以根据实际情况进行选择和提供。
领取专属 10元无门槛券
手把手带您无忧上云