HTML5 canvas Line Tutorial

To create a simple line with Konva, we can instantiate a Konva.Line() object.

For full list of properties and methods, see the Line API Reference.

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);

const redLine = new Konva.Line({
  points: [5, 70, 140, 23, 250, 60, 300, 20],
  stroke: 'red',
  strokeWidth: 15,
  lineCap: 'round',
  lineJoin: 'round'
});

// line segments with a length of 33px with a gap of 10px
const greenLine = new Konva.Line({
  points: [5, 70, 140, 23, 250, 60, 300, 20],
  stroke: 'green',
  strokeWidth: 2,
  lineJoin: 'round',
  dash: [33, 10]
});

// line segments with a length of 29px with a gap of 20px
// followed by a dot (0.001px) and another gap of 20px
const blueLine = new Konva.Line({
  points: [5, 70, 140, 23, 250, 60, 300, 20],
  stroke: 'blue',
  strokeWidth: 10,
  lineCap: 'round',
  lineJoin: 'round',
  dash: [29, 20, 0.001, 20]
});

redLine.move({ x: 0, y: 5 });
greenLine.move({ x: 0, y: 55 });
blueLine.move({ x: 0, y: 105 });

layer.add(redLine, greenLine, blueLine);

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React

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

const App = () => {
  return (
    <Stage width={window.innerWidth} height={window.innerHeight}>
      <Layer>
        <Line
          points={[5, 70, 140, 23, 250, 60, 300, 20]}
          stroke="red"
          strokeWidth={15}
          lineCap="round"
          lineJoin="round"
          y={5}
        />
        <Line
          points={[5, 70, 140, 23, 250, 60, 300, 20]}
          stroke="green"
          strokeWidth={2}
          lineJoin="round"
          dash={[33, 10]}
          y={55}
        />
        <Line
          points={[5, 70, 140, 23, 250, 60, 300, 20]}
          stroke="blue"
          strokeWidth={10}
          lineCap="round"
          lineJoin="round"
          dash={[29, 20, 0.001, 20]}
          y={105}
        />
      </Layer>
    </Stage>
  );
};

export default App;

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Vue

<template>
  <v-stage :config="stageSize">
    <v-layer>
      <v-line :config="redLineConfig" />
      <v-line :config="greenLineConfig" />
      <v-line :config="blueLineConfig" />
    </v-layer>
  </v-stage>
</template>

<script setup>
const stageSize = {
  width: window.innerWidth,
  height: window.innerHeight
};

const redLineConfig = {
  points: [5, 70, 140, 23, 250, 60, 300, 20],
  stroke: 'red',
  strokeWidth: 15,
  lineCap: 'round',
  lineJoin: 'round',
  y: 5
};

const greenLineConfig = {
  points: [5, 70, 140, 23, 250, 60, 300, 20],
  stroke: 'green',
  strokeWidth: 2,
  lineJoin: 'round',
  dash: [33, 10],
  y: 55
};

const blueLineConfig = {
  points: [5, 70, 140, 23, 250, 60, 300, 20],
  stroke: 'blue',
  strokeWidth: 10,
  lineCap: 'round',
  lineJoin: 'round',
  dash: [29, 20, 0.001, 20],
  y: 105
};
</script>

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