Pinch to pan-n-zoom react-native-svg components using a render prop.
Advanced Example: InfiniDraw Universal svg drawing with pan and zoom. Builds on Next.js and react-native-web for the web version, and react-native for native apps. Uses react-native-svg on native, svgs for the web, and zoomable-svg in both.
import React, { Component } from 'react';
import { View, StyleSheet, Dimensions, Animated } from 'react-native';
import { Svg } from 'expo';
import ZoomableSvg from 'zoomable-svg';
const { G, Circle, Path, Rect } = Svg;
const { width, height } = Dimensions.get('window');
const AnimatedRect = Animated.createAnimatedComponent(Rect);
const colors = ['red', 'green', 'blue', 'yellow', 'brown'];
class SvgRoot extends Component {
state = {
color: 'red',
initAnim: new Animated.Value(0),
};
componentDidMount() {
Animated.timing(
// Animate over time
this.state.initAnim,
{
toValue: 1,
duration: 3000,
useNativeDriver: false,
},
).start();
}
onPress = () => {
this.setState(({ color }) => ({
color: colors[(colors.indexOf(color) + 1) % colors.length],
}));
const { onToggle } = this.props;
if (onToggle) {
onToggle();
}
};
render() {
const { initAnim, color } = this.state;
let translateRectY = initAnim.interpolate({
inputRange: [0, 1],
outputRange: ['0', '50'],
});
const { transform } = this.props;
return (
<Svg width={width} height={height}>
<G transform={transform}>
<AnimatedRect
y={translateRectY}
x="5"
width="90"
height="90"
fill="rgb(0,0,255)"
strokeWidth="3"
stroke="rgb(0,0,0)"
/>
<Rect
x="5"
y="5"
width="55"
height="55"
fill="white"
/>
<Circle
cx="32"
cy="32"
r="4.167"
fill={color}
onPress={this.onPress}
/>
<Path
d="M55.192 27.87l-5.825-1.092a17.98 17.98 0 0 0-1.392-3.37l3.37-4.928c.312-.456.248-1.142-.143-1.532l-4.155-4.156c-.39-.39-1.076-.454-1.532-.143l-4.928 3.37a18.023 18.023 0 0 0-3.473-1.42l-1.086-5.793c-.103-.543-.632-.983-1.185-.983h-5.877c-.553 0-1.082.44-1.185.983l-1.096 5.85a17.96 17.96 0 0 0-3.334 1.393l-4.866-3.33c-.456-.31-1.142-.247-1.532.144l-4.156 4.156c-.39.39-.454 1.076-.143 1.532l3.35 4.896a18.055 18.055 0 0 0-1.37 3.33L8.807 27.87c-.542.103-.982.632-.982 1.185v5.877c0 .553.44 1.082.982 1.185l5.82 1.09a18.013 18.013 0 0 0 1.4 3.4l-3.31 4.842c-.313.455-.25 1.14.142 1.53l4.155 4.157c.39.39 1.076.454 1.532.143l4.84-3.313c1.04.563 2.146 1.02 3.3 1.375l1.096 5.852c.103.542.632.982 1.185.982h5.877c.553 0 1.082-.44 1.185-.982l1.086-5.796c1.2-.354 2.354-.82 3.438-1.4l4.902 3.353c.456.313 1.142.25 1.532-.142l4.155-4.154c.39-.39.454-1.076.143-1.532l-3.335-4.874a18.016 18.016 0 0 0 1.424-3.44l5.82-1.09c.54-.104.98-.633.98-1.186v-5.877c0-.553-.44-1.082-.982-1.185zM32 42.085c-5.568 0-10.083-4.515-10.083-10.086 0-5.568 4.515-10.084 10.083-10.084 5.57 0 10.086 4.516 10.086 10.083 0 5.57-4.517 10.085-10.086 10.085z"
fill="blue"
/>
</G>
</Svg>
);
}
}
const constraintCombinations = [
'none',
'dynamic',
'static',
'union',
'intersect',
];
export default class App extends Component {
state = {
type: 1,
constrain: true,
constraints: {
combine: 'dynamic',
scaleExtent: [width / height, 5],
translateExtent: [[0, 0], [100, 100]],
},
};
onToggle = () =>
this.setState(({ type, constraints }) => {
const nextType = (type + 1) % constraintCombinations.length;
return {
type: nextType,
constrain: nextType !== 0,
constraints: {
...constraints,
combine: constraintCombinations[nextType],
},
};
});
childProps = { onToggle: this.onToggle };
render() {
const { constrain, constraints } = this.state;
return (
<View style={styles.container}>
<ZoomableSvg
align="mid"
vbWidth={100}
vbHeight={100}
width={width}
height={height}
initialTop={-20}
initialLeft={-50}
initialZoom={1.2}
doubleTapThreshold={300}
meetOrSlice="meet"
svgRoot={SvgRoot}
childProps={this.childProps}
constrain={constrain ? constraints : null}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
backgroundColor: '#ecf0f1',
},
});import React, { Component } from 'react';
import {
View,
StyleSheet,
Dimensions,
PanResponder,
TouchableOpacity,
Text,
} from 'react-native';
import { Svg } from 'expo';
import ZoomableSvg from 'zoomable-svg';
const { G, Path, Rect } = Svg;
const { width, height } = Dimensions.get('window');
class SvgRoot extends Component {
state = {
paths: [],
currentPath: null,
};
processTouch = (sx, sy) => {
const { transform } = this.props;
const { currentPath } = this.state;
const { translateX, translateY, scaleX, scaleY } = transform;
const x = (sx - translateX) / scaleX;
const y = (sy - translateY) / scaleY;
if (!currentPath) {
this.setState({ currentPath: `M${x},${y}` });
} else {
this.setState({ currentPath: `${currentPath}L${x},${y}` });
}
};
componentWillMount() {
const noop = () => {};
const yes = () => true;
const shouldRespond = () => {
return this.props.drawing;
};
this._panResponder = PanResponder.create({
onPanResponderGrant: noop,
onPanResponderTerminate: noop,
onShouldBlockNativeResponder: yes,
onMoveShouldSetPanResponder: shouldRespond,
onStartShouldSetPanResponder: shouldRespond,
onPanResponderTerminationRequest: shouldRespond,
onMoveShouldSetPanResponderCapture: shouldRespond,
onStartShouldSetPanResponderCapture: shouldRespond,
onPanResponderMove: ({ nativeEvent: { touches } }) => {
const { length } = touches;
if (length === 1) {
const [{ pageX, pageY }] = touches;
this.processTouch(pageX, pageY);
}
},
onPanResponderRelease: () => {
this.setState(({ paths, currentPath }) => ({
paths: [...paths, currentPath],
currentPath: null,
}));
},
});
}
render() {
const { paths, currentPath } = this.state;
const { transform } = this.props;
return (
<View {...this._panResponder.panHandlers}>
<Svg width={width} height={height} style={styles.absfill}>
<G transform={transform}>
<Rect x="0" y="0" width="100" height="100" fill="white" />
{paths.map(path => (
<Path d={path} stroke="black" strokeWidth="1" fill="none" />
))}
</G>
</Svg>
<Svg width={width} height={height} style={styles.absfill}>
<G transform={transform}>
{currentPath
? <Path
d={currentPath}
stroke="black"
strokeWidth="1"
fill="none"
/>
: null}
</G>
</Svg>
</View>
);
}
}
const constraints = {
combine: 'dynamic',
scaleExtent: [width / height, 5],
translateExtent: [[0, 0], [100, 100]],
};
export default class App extends Component {
state = {
drawing: false,
};
toggleDrawing = () => {
this.setState(({ drawing }) => ({
drawing: !drawing,
}));
};
render() {
const { drawing } = this.state;
return (
<View style={[styles.container, styles.absfill]}>
<ZoomableSvg
align="mid"
vbWidth={100}
vbHeight={100}
width={width}
height={height}
initialTop={0}
initialLeft={0}
initialZoom={1}
doubleTapThreshold={300}
meetOrSlice="meet"
svgRoot={SvgRoot}
lock={drawing}
childProps={this.state}
constrain={constraints}
/>
<TouchableOpacity onPress={this.toggleDrawing} style={styles.button}>
<Text>{drawing ? 'Move' : 'Draw'}</Text>
</TouchableOpacity>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
backgroundColor: '#ecf0f1',
},
absfill: {
position: 'absolute',
top: 0,
left: 0,
bottom: 0,
right: 0,
},
button: {
position: 'absolute',
bottom: 10,
right: 10,
},
});