使用 Konva 对 10,000 个带工具提示的图形进行压力测试

此示例展示如何高效处理大量图形（10,000 个圆形）和工具提示。将鼠标悬停在任意圆形上时，工具提示会显示其索引和颜色。

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 circlesLayer = new Konva.Layer();
const tooltipLayer = new Konva.Layer();
const colors = ['red', 'orange', 'yellow', 'green', 'blue', 'cyan', 'purple'];
let colorIndex = 0;

for (let i = 0; i < 10000; i++) {
  const color = colors[colorIndex++];
  if (colorIndex >= colors.length) {
    colorIndex = 0;
  }

  const randX = Math.random() * stage.width();
  const randY = Math.random() * stage.height();
  const circle = new Konva.Circle({
    x: randX,
    y: randY,
    radius: 3,
    fill: color,
    name: i.toString(),
  });

  circlesLayer.add(circle);
}

const tooltip = new Konva.Text({
  text: '',
  fontFamily: 'Calibri',
  fontSize: 12,
  padding: 5,
  visible: false,
  fill: 'black',
  opacity: 0.75,
});

tooltipLayer.add(tooltip);
stage.add(circlesLayer);
stage.add(tooltipLayer);

circlesLayer.on('mousemove', (e) => {
  const mousePos = stage.getPointerPosition();
  tooltip.position({
    x: mousePos.x + 5,
    y: mousePos.y + 5,
  });
  tooltip.text('node: ' + e.target.name() + ', color: ' + e.target.fill());
  tooltip.show();
});

circlesLayer.on('mouseout', () => {
  tooltip.hide();
});

React

import React from 'react';
import { Stage, Layer, Circle, Text } from 'react-konva';

const App = () => {
  const [tooltipProps, setTooltipProps] = React.useState({
    text: '',
    visible: false,
    x: 0,
    y: 0
  });

  const colors = ['red', 'orange', 'yellow', 'green', 'blue', 'cyan', 'purple'];
  const circles = React.useMemo(() => {
    const items = [];
    let colorIndex = 0;
    
    for (let i = 0; i < 10000; i++) {
      const color = colors[colorIndex++];
      if (colorIndex >= colors.length) {
        colorIndex = 0;
      }
      
      items.push({
        id: i,
        x: Math.random() * window.innerWidth,
        y: Math.random() * window.innerHeight,
        color
      });
    }
    return items;
  }, []);

  const handleMouseMove = (e) => {
    const mousePos = e.target.getStage().getPointerPosition();
    setTooltipProps({
      text: `node: ${e.target.name()}, color: ${e.target.attrs.fill}`,
      visible: true,
      x: mousePos.x + 5,
      y: mousePos.y + 5
    });
  };

  const handleMouseOut = () => {
    setTooltipProps(prev => ({ ...prev, visible: false }));
  };

  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer onMouseMove={handleMouseMove} onMouseOut={handleMouseOut}>
        {circles.map(({ id, x, y, color }) => (
          <Circle
            key={id}
            x={x}
            y={y}
            radius={3}
            fill={color}
            name={id.toString()}
          />
        ))}
      </Layer>
      <Layer>
        <Text
          {...tooltipProps}
          fontFamily="Calibri"
          fontSize={12}
          padding={5}
          fill="black"
          opacity={0.75}
        />
      </Layer>
    </Stage>
  );
};

export default App;

Vue

<template>
  <v-stage :config="stageSize">
    <v-layer @mousemove="handleMouseMove" @mouseout="handleMouseOut">
      <v-circle
        v-for="circle in circles"
        :key="circle.id"
        :config="{
          x: circle.x,
          y: circle.y,
          radius: 3,
          fill: circle.color,
          name: circle.id.toString()
        }"
      />
    </v-layer>
    <v-layer>
      <v-text
        :config="{
          ...tooltipProps,
          fontFamily: 'Calibri',
          fontSize: 12,
          padding: 5,
          fill: 'black',
          opacity: 0.75,
          textFill: 'white'
        }"
      />
    </v-layer>
  </v-stage>
</template>

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

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

const tooltipProps = ref({
  text: '',
  visible: false,
  x: 0,
  y: 0
});

const colors = ['red', 'orange', 'yellow', 'green', 'blue', 'cyan', 'purple'];
const circles = computed(() => {
  const items = [];
  let colorIndex = 0;
  
  for (let i = 0; i < 10000; i++) {
    const color = colors[colorIndex++];
    if (colorIndex >= colors.length) {
      colorIndex = 0;
    }
    
    items.push({
      id: i,
      x: Math.random() * stageSize.width,
      y: Math.random() * stageSize.height,
      color
    });
  }
  return items;
});

const handleMouseMove = (e) => {
  const mousePos = e.target.getStage().getPointerPosition();
  tooltipProps.value = {
    text: `node: ${e.target.name()}, color: ${e.target.attrs.fill}`,
    visible: true,
    x: mousePos.x + 5,
    y: mousePos.y + 5
  };
};

const handleMouseOut = () => {
  tooltipProps.value.visible = false;
};
</script>