HTML5 Canvas 按类型选择图形教程

要使用 Konva 按类型选择图形，可以向 find() 方法传入类型名称或类名。 find() 方法返回一个数组，其中包含与选择器字符串匹配的节点。

Vanilla

import Konva from 'konva';

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

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

// create shapes of different types
const circle1 = new Konva.Circle({
  x: 50,
  y: stage.height() / 2,
  radius: 30,
  fill: 'red'
});

const circle2 = new Konva.Circle({
  x: 150,
  y: stage.height() / 2,
  radius: 30,
  fill: 'green'
});

const rect = new Konva.Rect({
  x: 250,
  y: stage.height() / 2 - 25,
  width: 50,
  height: 50,
  fill: 'blue'
});

layer.add(circle1);
layer.add(circle2);
layer.add(rect);

// find all circles by type
const circles = layer.find('Circle');
circles.forEach(circle => {
  // add animation to circles only
  circle.to({
    duration: 1,
    scale: { x: 1.5, y: 1.5 },
    easing: Konva.Easings.EaseInOut
  });
});

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React

import { Stage, Layer, Circle, Rect } from 'react-konva';
import { useEffect, useRef } from 'react';

const App = () => {
  const layerRef = useRef(null);
  
  useEffect(() => {
    // find all circles by type and animate them
    const circles = layerRef.current.find('Circle');
    circles.forEach(circle => {
      circle.to({
        duration: 1,
        scale: { x: 1.5, y: 1.5 },
        easing: Konva.Easings.EaseInOut
      });
    });
  }, []);

  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer ref={layerRef}>
        <Circle
          x={50}
          y={window.innerHeight / 2}
          radius={30}
          fill="red"
        />
        <Circle
          x={150}
          y={window.innerHeight / 2}
          radius={30}
          fill="green"
        />
        <Rect
          x={250}
          y={window.innerHeight / 2 - 25}
          width={50}
          height={50}
          fill="blue"
        />
      </Layer>
    </Stage>
  );
};

export default App;

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Vue

<template>
  <v-stage :config="stageSize">
    <v-layer ref="layerRef">
      <v-circle :config="circle1Config" />
      <v-circle :config="circle2Config" />
      <v-rect :config="rectConfig" />
    </v-layer>
  </v-stage>
</template>

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

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

const circle1Config = {
  x: 50,
  y: window.innerHeight / 2,
  radius: 30,
  fill: 'red'
};

const circle2Config = {
  x: 150,
  y: window.innerHeight / 2,
  radius: 30,
  fill: 'green'
};

const rectConfig = {
  x: 250,
  y: window.innerHeight / 2 - 25,
  width: 50,
  height: 50,
  fill: 'blue'
};

const layerRef = ref(null);

onMounted(() => {
  // find all circles by type and animate them
  const circles = layerRef.value.getNode().find('Circle');
  circles.forEach(circle => {
    circle.to({
      duration: 1,
      scale: { x: 1.5, y: 1.5 },
      easing: Konva.Easings.EaseInOut
    });
  });
});
</script>

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