如何在画布上调整文本大小?

请记住，Konva.Transformer 会改变节点的 scaleX 和 scaleY 属性。如果您想在不改变文本大小的情况下更改文本的宽度，您应该将文本的缩放重置为 1，并相应地调整 width。

您可以使用 transform 事件根据需要更新文本的属性。

说明：尝试调整文本大小。

Vanilla

import Konva from 'konva';

const width = window.innerWidth;
const height = window.innerHeight;

const stage = new Konva.Stage({
container: 'container',
width: width,
height: height,
});

const layer = new Konva.Layer();
stage.add(layer);

const text = new Konva.Text({
x: 50,
y: 50,
text: 'Hello from Konva! Try to resize me.',
fontSize: 24,
draggable: true,
width: 200,
});
layer.add(text);

const tr = new Konva.Transformer({
nodes: [text],
// 仅启用一个锚点，以便更好地查看正在发生的事情

// 我们只改变宽度

enabledAnchors: ['middle-left', 'middle-right'],
});
layer.add(tr);

text.on('transform', function () {
// 在变换时重置缩放

text.setAttrs({
width: text.width() * text.scaleX(),
scaleX: 1,
});
});

Open Sandbox

React

import { Stage, Layer, Text, Transformer } from 'react-konva';
import { useRef, useEffect, useState } from 'react';

const App = () => {
  const [textWidth, setTextWidth] = useState(200);
  const textRef = useRef();
  const trRef = useRef();

  useEffect(() => {
    trRef.current.nodes([textRef.current]);
  }, []);

  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer>
        <Text
          x={50}
          y={50}
          text="Hello from Konva! Try to resize me."
          fontSize={24}
          draggable
          width={textWidth}
          ref={textRef}
          onTransform={() => {
            const node = textRef.current;
            setTextWidth(node.width() * node.scaleX());
            node.scaleX(1);
          }}
        />
        <Transformer
          ref={trRef}
          enabledAnchors={['middle-left', 'middle-right']}
        />
      </Layer>
    </Stage>
  );
};

export default App;

Open Sandbox

Vue

<template>
  <v-stage :config="stageSize">
    <v-layer>
      <v-text
        :config="textConfig"
        @transform="handleTransform"
        ref="textRef"
      />
      <v-transformer
        :config="transformerConfig"
        ref="transformerRef"
      />
    </v-layer>
  </v-stage>
</template>

<script setup>
import { ref, computed, onMounted } from 'vue';

const stageSize = {
  width: window.innerWidth,
  height: window.innerHeight
};

const textWidth = ref(200);

const textConfig = computed(() => ({
  x: 50,
  y: 50,
  text: 'Hello from Konva! Try to resize me.',
  fontSize: 24,
  draggable: true,
  width: textWidth.value
}));

const transformerConfig = {
  enabledAnchors: ['middle-left', 'middle-right']
};

const textRef = ref(null);
const transformerRef = ref(null);

const handleTransform = () => {
  const node = textRef.value.getNode();
  textWidth.value = node.width() * node.scaleX();
  node.scaleX(1);
};

onMounted(() => {
  transformerRef.value.getNode().nodes([textRef.value.getNode()]);
});
</script>

Open Sandbox