Expand Image on Hover

This demo shows how to create an effect where images expand when the mouse hovers over them. The images are also draggable.

Instructions: Hover your mouse over the images to see them expand.

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);

// Create Darth Vader image
const darthVaderImg = new Konva.Image({
  x: 110,
  y: 88,
  width: 200,
  height: 137,
  offset: {
    x: 100,
    y: 68,
  },
  draggable: true,
});
layer.add(darthVaderImg);

// Create Yoda image
const yodaImg = new Konva.Image({
  x: 290,
  y: 70,
  width: 93,
  height: 104,
  offset: {
    x: 46,
    y: 52,
  },
  draggable: true,
});
layer.add(yodaImg);

// Load Darth Vader image
const imageObj1 = new Image();
imageObj1.onload = function () {
  darthVaderImg.image(imageObj1);
};
imageObj1.src = 'https://konvajs.org/assets/darth-vader.jpg';

// Load Yoda image
const imageObj2 = new Image();
imageObj2.onload = function () {
  yodaImg.image(imageObj2);
};
imageObj2.src = 'https://konvajs.org/assets/yoda.jpg';

// Use event delegation to update pointer style and apply scaling
layer.on('mouseover', function (evt) {
  const shape = evt.target;
  document.body.style.cursor = 'pointer';
  
  // Scale up the image on hover
  shape.to({
    scaleX: 1.2,
    scaleY: 1.2,
    duration: 0.2,
  });
});

layer.on('mouseout', function (evt) {
  const shape = evt.target;
  document.body.style.cursor = 'default';
  
  // Scale back to normal when mouse leaves
  shape.to({
    scaleX: 1,
    scaleY: 1,
    duration: 0.2,
  });
});

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React

import { useState, useEffect } from 'react';
import { Stage, Layer, Image } from 'react-konva';
import { useImage } from 'react-konva-utils';

const ImageWithHover = ({ src, x, y, width, height, offsetX, offsetY }) => {
  const [image] = useImage(src);
  const [isHovered, setIsHovered] = useState(false);
  
  const scale = isHovered ? 1.2 : 1;
  
  return (
    <Image
      image={image}
      x={x}
      y={y}
      width={width}
      height={height}
      offsetX={offsetX}
      offsetY={offsetY}
      scaleX={scale}
      scaleY={scale}
      draggable
      onMouseEnter={() => setIsHovered(true)}
      onMouseLeave={() => setIsHovered(false)}
    />
  );
};

const App = () => {
  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer>
        <ImageWithHover
          src="https://konvajs.org/assets/darth-vader.jpg"
          x={110}
          y={88}
          width={200}
          height={137}
          offsetX={100}
          offsetY={68}
        />
        <ImageWithHover
          src="https://konvajs.org/assets/yoda.jpg"
          x={290}
          y={70}
          width={93}
          height={104}
          offsetX={46}
          offsetY={52}
        />
      </Layer>
    </Stage>
  );
};

export default App;

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Vue

<template>
  <v-stage :config="stageConfig">
    <v-layer ref="layerRef">
      <v-image
        v-for="(img, index) in images"
        :key="index"
        :config="getImageConfig(img, index)"
        @mouseenter="handleMouseEnter(index)"
        @mouseleave="handleMouseLeave(index)"
      />
    </v-layer>
  </v-stage>
</template>

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

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

const layerRef = ref(null);
const hoveredIndex = ref(null);
const loadedImages = ref({});

// Define image data
const images = ref([
  {
    src: 'https://konvajs.org/assets/darth-vader.jpg',
    x: 110,
    y: 88,
    width: 200,
    height: 137,
    offsetX: 100,
    offsetY: 68,
    loaded: false
  },
  {
    src: 'https://konvajs.org/assets/yoda.jpg',
    x: 290,
    y: 70,
    width: 93,
    height: 104,
    offsetX: 46,
    offsetY: 52,
    loaded: false
  }
]);

// Load images
onMounted(() => {
  images.value.forEach((img, index) => {
    const imageObj = new Image();
    imageObj.onload = () => {
      loadedImages.value = {
        ...loadedImages.value,
        [index]: imageObj
      };
    };
    imageObj.src = img.src;
  });
});

// Get configuration for each image
const getImageConfig = (img, index) => {
  const isHovered = hoveredIndex.value === index;
  const scale = isHovered ? 1.2 : 1;
  
  return {
    image: loadedImages.value[index],
    x: img.x,
    y: img.y,
    width: img.width,
    height: img.height,
    offsetX: img.offsetX,
    offsetY: img.offsetY,
    scaleX: scale,
    scaleY: scale,
    draggable: true
  };
};

// Mouse event handlers
const handleMouseEnter = (index) => {
  hoveredIndex.value = index;
  document.body.style.cursor = 'pointer';
};

const handleMouseLeave = () => {
  hoveredIndex.value = null;
  document.body.style.cursor = 'default';
};
</script>

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