# Vector.js

Vector is an open source javascript library for creating interactive graphics. View the repository, run the tests, or meet the team.

# Cartesian Coordinate System Open in Sandbox

## Description

This interactive demonstrates the cartesian coordinate system.

## Script

``````/**
* @title Cartesian Coordinate System
* @description This interactive demonstrates the cartesian coordinate system.
* @tags [math]
*/
// import Interactive from 'https://unpkg.com/@interactive-svg/library/dist/Interactive.js';
import { Interactive } from '../../index.js';
export default function main(id) {
// Initialize the interactive
let margin = 32;
let interactive = new Interactive(id);
// interactive.border = true;
interactive.originX = interactive.width / 2 + margin;
interactive.originY = interactive.height / 2 + margin;
interactive.width += 2 * margin;
interactive.height += 2 * margin;
interactive.style.overflow = 'visible';
// Create three control points
let point = interactive.control(0, 0);
let xAxis = interactive.line(-interactive.width / 2 + margin, 0, interactive.width / 2 - margin, 0);
let yAxis = interactive.line(0, -interactive.height / 2 + margin, 0, interactive.height / 2 - margin);
let rectangle = interactive.rectangle(xAxis.x1, yAxis.y1, xAxis.x2 - xAxis.x1, yAxis.y2 - yAxis.y1);
point.constrainWithinBox(xAxis.x1, yAxis.y1, xAxis.x2, yAxis.y2);
let boxConstraint = point.constrain;
point.constrain = (o, n) => {
// first snap to grid
let x = 50 * Math.round(n.x / 50);
let y = 50 * Math.round(n.y / 50);
// then constrain within box
let p = boxConstraint({ x: x, y: y }, { x: x, y: y });
return { x: p.x, y: p.y };
};
let text = interactive.text(150, 150, "myText");
text.update = function () {
this.x = point.x + 15;
this.y = point.y - 15;
this.contents = `(\${point.x / 50},\${-point.y / 50})`;
};
text.update();
let marker = interactive.marker(10, 5, 10, 10);
marker.path('M 0 0 L 10 5 L 0 10 z').style.fill = '#404040';
marker.setAttribute('orient', 'auto-start-reverse');
xAxis.setAttribute('marker-end', `url(#\${marker.id})`);
xAxis.setAttribute('marker-start', `url(#\${marker.id})`);
yAxis.setAttribute('marker-end', `url(#\${marker.id})`);
yAxis.setAttribute('marker-start', `url(#\${marker.id})`);
let xAxisLabel = interactive.text(xAxis.x2 + 16, xAxis.y2, 'x');
xAxisLabel.setAttribute('alignment-baseline', 'middle');
let yAxisLabel = interactive.text(yAxis.x1, yAxis.y1 - 16, 'y');
yAxisLabel.setAttribute('text-anchor', 'middle');
let xPosition = interactive.line(0, 0, 0, 0);
xPosition.style.stroke = 'cornflowerblue';
xPosition.update = function () {
this.x1 = point.x;
this.x2 = point.x;
this.y2 = point.y;
};
let yPosition = interactive.line(0, 0, 0, 0);
yPosition.style.stroke = 'cornflowerblue';
yPosition.update = function () {
this.y1 = point.y;
this.x2 = point.x;
this.y2 = point.y;
};
let w = 50;
let h = 50;
// for( let i = -6; i <= 6; i++) {
//   for( let j = -3; j <= 3; j ++) {
//     let x = i*w;
//     let y = j*h;
//     let circle = interactive.circle(x,y, 8);
//     circle.style.opacity = '.1';
//     circle.style.fill = 'rgb(58	167	87)';
//   }
// }
for (let i = -6; i <= 6; i++) {
let x = i * w;
let vertical = interactive.line(x, -150, x, 150);
let label = interactive.text(x, 150 + margin, i.toString());
label.style.textAnchor = 'middle';
label.style.alignmentBaseline = 'middle';
vertical.style.strokeOpacity = '.2';
}
for (let i = -3; i <= 3; i++) {
let y = i * h;
let horizontal = interactive.line(-300, y, 300, y);
let label = interactive.text(-300 - 20, y, i.toString());
label.style.textAnchor = 'middle';
label.style.alignmentBaseline = 'middle';
horizontal.style.strokeOpacity = '.2';
}
point.translate(150, -100);
interactive.circle(0, 0, 3).style.fill = '#404040';
}
//# sourceMappingURL=cartesian-coordinate-system.js.map
``````