Basic Tweening Tutorial

To tween properties with Konva, we can instantiate a Konva.Tween object and then start the tween by calling play(). Any numeric property of a Shape, Group, Layer, or Stage can be transitioned, such as:

• x, y (position)
• rotation
• width, height, radius
• strokeWidth
• opacity
• scaleX, scaleY
• offsetX, offsetY

For a full list of attributes and methods, check out the Konva.Tween documentation.

Instructions: Click the circle to start a simple linear animation.

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();

const circle = new Konva.Circle({
x: 100,
y: height / 2,
radius: 70,
fill: 'red',
stroke: 'black',
strokeWidth: 4,
});

layer.add(circle);
stage.add(layer);

circle.on('click tap', () => {
// simple tween

const tween = new Konva.Tween({
node: circle,
duration: 1,
x: width - 100,
easing: Konva.Easings.Linear,
});
tween.play();
});

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React

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

const App = () => {
  const circleRef = useRef();

  const handleClick = () => {
    const tween = new Konva.Tween({
      node: circleRef.current,
      duration: 1,
      x: window.innerWidth - 100,
      easing: Konva.Easings.Linear,
    });
    tween.play();
  };

  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer>
        <Circle
          ref={circleRef}
          x={100}
          y={window.innerHeight / 2}
          radius={70}
          fill="red"
          stroke="black"
          strokeWidth={4}
          onClick={handleClick}
          onTap={handleClick}
        />
      </Layer>
    </Stage>
  );
};

export default App;

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Vue

<template>
  <v-stage :config="stageSize">
    <v-layer>
      <v-circle
        :config="circleConfig"
        @click="handleClick"
        @tap="handleClick"
        ref="circleRef"
      />
    </v-layer>
  </v-stage>
</template>

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

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

const circleConfig = {
  x: 100,
  y: window.innerHeight / 2,
  radius: 70,
  fill: 'red',
  stroke: 'black',
  strokeWidth: 4
};

const circleRef = ref(null);

const handleClick = () => {
  const tween = new Konva.Tween({
    node: circleRef.value.getNode(),
    duration: 1,
    x: window.innerWidth - 100,
    easing: Konva.Easings.Linear,
  });
  tween.play();
};
</script>

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