Simply trying to draw an arrow line using the following code
import * as React from 'react';
import { Text, View, StyleSheet } from 'react-native';
import Svg, { Defs, Line, Marker, Path } from "react-native-svg";
export default function App() {
return (
<Svg>
<Defs>
<Marker
id="arrow"
refX={0}
refY={3}
markerWidth="6"
markerHeight="6"
orient="auto"
>
<Path d="M 0 0 L 6 3 L 0 6 z" fill={"red"} stroke={"red"} strokeWidth="2" />
</Marker>
</Defs>
<Line
x1={80}
y1={80}
x2={220}
y2={220}
stroke={"green"}
strokeWidth="2"
markerEnd="url(#arrow)"
/>
</Svg>
);
}
The above code draws a line with an arrow fine on iOS but doesn't work on Android at all, it draws a simple line in Android without the markerEnd.
Is this is a bug, or I am doing anything wrong?
Live example here https://snack.expo.dev/@vedexpo/d2ed3c which clearly shows it doesn't work on Android.
Thanks.
Thanks, @sandarshnaroju for the trick I was looking for, however, it works with the fixed values only. Here is my solution where I am drawing the arrowhead dynamically, which might help anyone looking for a similar solution.
import React, { Component } from 'react';
import Svg, { Line, Polygon } from 'react-native-svg';
export default class App extends Component {
drawHead=(x0, y0, x1, y1, h, w)=> {
var L = Math.sqrt(Math.pow((x0 - x1), 2) + Math.pow((y0 - y1), 2));
//first base point coordinates
var base_x0 = x1 + (w / 2) * (y1 - y0) / L;
var base_y0 = y1 + (w / 2) * (x0 - x1) / L;
//second base point coordinates
var base_x1 = x1 - (w / 2) * (y1 - y0) / L;
var base_y1 = y1 - (w / 2) * (x0 - x1) / L;
var dx = 0;
var dy = 0;
var head_x = 0;
var head_y = 0;
if (x1 == x0) {
dx = 0;
dy = h;
if (y1 < y0) {
dy = -h;
}
} else if (y1 == y0) {
dx = h;
dy = 0;
if (x1 < x0) {
dx = -h;
}
} else {
if (x1 < x0) {
h = -h;
}
var slope = (y1 - y0) / (x1 - x0);
dx = h / Math.sqrt(1 + Math.pow(slope, 2));
dy = dx * slope;
}
//head_points
head_x = x1 + dx;
head_y = y1 + dy;
return `${base_x0},${base_y0} ${base_x1},${base_y1} ${head_x},${head_y}`;
}
render(){
var x1=50
var y1=80
var x2=150
var y2=30
var arrowPoints = this.drawHead(x1,y1,x2,y2,8,10)
return (
<Svg width={300} height={300}>
<Line
x1={x1}
y1={y1}
x2={x2}
y2={y2}
stroke={'green'}
strokeWidth="2"
markerEnd="url(#arrow)"
/>
<Polygon
points={arrowPoints}
fill="green"
/>
</Svg>
);
}
}
Hope it helps someone.
Cheers.