Vector.js

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

Unit Circle Open in Sandbox

Description

This interactive demonstrates the properties of the unit circle in relation to the trigonometric functions sine, cosine, and tangent.

Script

/**
* @title Unit Circle
* @description This interactive demonstrates the properties of the unit circle in relation to the trigonometric functions sine, cosine, and tangent.
* @tags [math]
* @date October 9, 2019
* @author Kurt Bruns
* @weight 1
*/
import { Interactive, BaseElement } from '../../index.js';
import { parseSVG } from '../../util/svg.js';
/**
* This wrapper object is how the circular dependecy between control elements is
* made more simple. Since all of the elements depend on the current angle when
* an input is changed then this element is updated and the change is
* propegated through the dependency graph.
*/
class NumberWrapper extends BaseElement {
    constructor(value) {
        super();
        this._value = value;
    }
    get value() {
        return this._value;
    }
    set value(value) {
        this._value = value;
        this.updateDependents();
    }
}
class UnitCircle {
    constructor(id, angle, func = Math.cos) {
    }
    set angle(value) {
    }
    get angle() {
        return this._angle;
    }
}
/**
* This main interactive contains the four components: the unit circle, the
* function graph, the variables, and the trigonometric functions.
*/
export default function main(id, opts) {
    /**
    * Default options for this interactive
    */
    let defaultOptions = {
        angle: 1,
        func: Math.cos
    };
    let interactive = new Interactive(id);
    let width = 230;
    let scale = width / Math.PI;
    let radius = scale;
    let margin = 2 * radius - width / 2;
    interactive.height = width + margin + width;
    interactive.width = width + margin + 2 * width + 2;
    let f = Math.cos;
    /**
    * This angle is the main element that most of the control
    * points both update and depend on.
    */
    let angle = new NumberWrapper(0);
    /**
    * Displays the unit circle.
    */
    let circleInteractive = interactive.interactive(0, 0);
    let circleRectangle = circleInteractive.rectangle(-width / 2, -width / 2, width, width);
    circleRectangle.classList.add('default');
    circleInteractive.height = width;
    circleInteractive.width = width;
    circleInteractive.originX = circleInteractive.width / 2;
    circleInteractive.originY = circleInteractive.height / 2;
    /**
    * Display the graph of the current trigonometric function.
    */
    let plotInteractive = interactive.interactive(width + margin, 0, {
        width: 2 * width,
        height: width
    });
    /**
    * Displays the value of the variables and a button for
    * animating the interactive.
    */
    let info = interactive.interactive(0, width + margin);
    info.width = width;
    info.height = width;
    // TODO: setting the border to true doesn't work?
    let infoRect = info.rectangle(0, 0, info.width, info.height);
    infoRect.classList.add('default');
    /**
    * Displays the current trigonometric function graphed and
    * allows the user to toggle between the functions
    */
    let functions = interactive.interactive(width + margin, width + margin);
    functions.width = 2 * width;
    functions.height = width;
    let functionsRect = functions.rectangle(0, 0, functions.width, functions.height);
    functionsRect.classList.add('default');
    // Unit Circle Section
    let triangle = circleInteractive.path('');
    triangle.style.stroke = '#333333';
    let circle = circleInteractive.circle(0, 0, radius);
    circle.style.fill = 'none';
    circle.style.stroke = '#333333';
    let control = circleInteractive.control(circle.r, 0);
    control.constrainTo(circle);
    control.addDependency(angle);
    control.update = function () {
        this.x = circle.r * Math.cos(angle.value);
        this.y = -circle.r * Math.sin(angle.value);
    };
    control.onchange = function () {
        if (control.y <= 0) {
            angle.value = Math.abs(Math.atan2(control.y, control.x));
        }
        else {
            angle.value = Math.PI * 2 - Math.atan2(control.y, control.x);
        }
    };
    triangle.addDependency(control, angle);
    if (f === Math.tan) {
        triangle.update = function () {
            triangle.d = `M 0 0
                    L ${circle.r / Math.cos(angle.value)} 0
                    L ${control.x} ${control.y}
                    Z`;
        };
    }
    else {
        triangle.update = function () {
            triangle.d = `M 0 0
                    L ${control.x} 0
                    L ${control.x} ${control.y}
                    Z`;
        };
    }
    triangle.update();
    // triangle.style.stroke = 'none';
    triangle.style.fill = '#f8f8f8';
    circleInteractive.circle(0, 0, 3).style.fill = '#404040';
    // Graph/Plot Section
    let plot = plotInteractive.plot(f, {
        scaleX: scale,
        scaleY: scale,
        originX: 0,
        originY: width / 2,
        width: 2 * width,
        height: width,
        margin: 0,
        labels: false,
        zoomable: false,
        displayPoint: false,
        grid: true,
        border: true
    });
    let line = plot.staticGroup.line(0, 0, 0, 0);
    line.setAttribute('transform', 'scale(1,-1)');
    line.style.stroke = 'cornflowerblue';
    line.style.strokeWidth = '2';
    line.addDependency(angle, plot);
    line.update = function () {
        line.x1 = scale * angle.value;
        line.y1 = 0;
        line.x2 = line.x1;
        line.y2 = plot.call(line.x1);
    };
    let chartControl = interactive.control(0, 0);
    plot.staticGroup.appendChild(chartControl);
    chartControl.addDependency(angle, plot);
    chartControl.update = function () {
        chartControl.x = scale * angle.value;
        chartControl.y = -plot.call(chartControl.x);
    };
    chartControl.update();
    chartControl.constrain = (oldPos, newPos) => {
        let x = (plotInteractive.width + newPos.x) % plotInteractive.width;
        let y = -plot.call(x);
        return { x: x, y: y };
    };
    chartControl.onchange = function () {
        angle.value = chartControl.x / scale;
    };
    // draw gridlines
    circleInteractive.background.classList.add('default');
    for (let i = -3; i <= 3; i++) {
        for (let j = -3; j <= 3; j++) {
            let rect2 = circleInteractive.rectangle(i * circle.r, j * circle.r, circle.r, circle.r);
            circleInteractive.background.prependChild(rect2);
            rect2.root.setAttribute('vector-effect', 'non-scaling-stroke');
            rect2.style.strokeOpacity = '.25';
        }
    }
    angle.value = 1;
    // plot.staticGroup.text( 8, -8, '0');
    plot.staticGroup.line(1 * radius * Math.PI / 2, -4, 1 * radius * Math.PI / 2, 4);
    plot.staticGroup.line(1 * radius * Math.PI / 1, -4, 1 * radius * Math.PI / 1, 4);
    plot.staticGroup.line(3 * radius * Math.PI / 2, -4, 3 * radius * Math.PI / 2, 4);
    // plot.staticGroup.line( 4*radius*Math.PI/2, -4, 4*radius*Math.PI/2, 4).style.strokeWidth = '3';
    plot.staticGroup.text(1 * radius * Math.PI - 4, -8, 'π');
    plot.staticGroup.text(2 * radius * Math.PI - 12, -8, 'τ');
    // x-axis labels
    interactive.text(circleInteractive.originX - radius - 4, circleInteractive.height + 20, '-1');
    interactive.text(circleInteractive.originX - 0 - 4, circleInteractive.height + 20, '0');
    interactive.text(circleInteractive.originX + radius - 4, circleInteractive.height + 20, '1');
    // position of plot origin
    let ox = width + margin;
    let oy = width / 2;
    // y-axis labels
    interactive.text(ox - 20, oy + 4, '0');
    interactive.text(ox - 24, oy + radius + 4, '-1');
    interactive.text(ox - 20, oy - radius + 4, '1');
    // bottom x-axis labels
    interactive.circle(ox, oy, 3).style.fill = '#404040';
    interactive.text(ox + 0 * radius - 4, oy + plotInteractive.height / 2 + 22, '0');
    interactive.text(ox + 1 * radius - 4, oy + plotInteractive.height / 2 + 20, '1');
    interactive.text(ox + 2 * radius - 4, oy + plotInteractive.height / 2 + 20, '2');
    interactive.text(ox + 3 * radius - 4, oy + plotInteractive.height / 2 + 20, '3');
    interactive.text(ox + 4 * radius - 4, oy + plotInteractive.height / 2 + 20, '4');
    interactive.text(ox + 5 * radius - 4, oy + plotInteractive.height / 2 + 20, '5');
    interactive.text(ox + 6 * radius - 4, oy + plotInteractive.height / 2 + 20, '6');
    interactive.line(ox + 2 * Math.PI * radius, oy - 4, ox + 2 * Math.PI * radius, oy + 4);
    // Info section
    let x = 20;
    let thetaDisplay = info.text(x, info.height * 1 / 5, "θ = ...");
    let xDisplay = info.text(x, info.height * 2 / 5, "x = ...");
    let yDisplay = info.text(x, info.height * 3 / 5, "y = ...");
    thetaDisplay.addDependency(control);
    thetaDisplay.update = function () {
        thetaDisplay.contents = `θ = ${getAngle().toFixed(2)}`;
        // thetaDisplay.contents = `θ = ${getAngle().toFixed(2)} or ${(getAngle()/(2*Math.PI)).toFixed(2)}τ`;
    };
    xDisplay.addDependency(control);
    xDisplay.update = function () {
        xDisplay.contents = `x = ${(control.x / circle.r).toFixed(2)}`;
    };
    yDisplay.addDependency(control);
    yDisplay.update = function () {
        yDisplay.contents = `y = ${(-control.y / circle.r).toFixed(2)}`;
    };
    let requestID = 0;
    let animating = false;
    let animate = info.button(3 * x, info.height * 4 / 5, "animate");
    animate.onclick = function () {
        let step = function (timestamp) {
            angle.value += .01;
            angle.value = angle.value % (2 * Math.PI);
            // chartControl.onchange();
            requestID = window.requestAnimationFrame(step);
        };
        if (animating) {
            window.cancelAnimationFrame(requestID);
            animating = false;
        }
        else {
            animating = true;
            requestID = window.requestAnimationFrame(step);
        }
    };
    // Functions section
    let radio = functions.radioControl(x + 16, functions.height / 2 - 16, ['cos(θ)', 'sin(θ)', 'tan(θ)']);
    radio.style.fontFamily = 'monospace';
    radio.style.fontSize = '18px';
    // TODO: replace with interchangeable functions katex or external SVG
    let group = functions.group();
    group.root.setAttribute('transform', `translate(${3 * radius},${functions.height * 2 / 6})`);
    let cos = cosineSVG();
    let sin = sineSVG();
    let tan = tangentSVG();
    group.root.appendChild(cos);
    group.root.appendChild(sin);
    group.root.appendChild(tan);
    radio.onchange = function () {
        cos.style.display = 'none';
        sin.style.display = 'none';
        tan.style.display = 'none';
        switch (radio.index) {
            case 0:
                cos.style.display = '';
                plot.function = Math.cos;
                break;
            case 1:
                sin.style.display = '';
                plot.function = Math.sin;
                break;
            case 2:
                tan.style.display = '';
                plot.function = Math.tan;
                break;
        }
        plot.draw();
    };
    radio.onchange();
    // Set the angle to be one radian
    control.x = circle.r * Math.cos(1);
    control.y = -circle.r * Math.sin(1);
    control.updateDependents();
    // Gets the normalized angle between zero and tau. TODO: Maybe transform the
    // coordinate system so that the positive y-direction is up instead of down.
    // UPDATE: transform = 'scale(1,-1)' applied to the main svg  didn't quite work
    // as expected: the text element was upside down, but maybe that could be
    // reversed? bleh.
    function getAngle() {
        if (control.y <= 0) {
            return Math.abs(Math.atan2(control.y, control.x));
        }
        else {
            return Math.PI * 2 - Math.atan2(control.y, control.x);
        }
    }
}
function tangentSVG() {
    return parseSVG(`<svg id="bb0285fc-d748-47cf-a94a-98b3778a2270" data-name="Layer 2" xmlns="http://www.w3.org/2000/svg" width="150.68" height="73.98" viewBox="0 0 150.68 73.98"><defs><style>.ac405426-a6c9-45ca-9e0e-ccf1136aba0e{fill:#333;}.bc64f476-72d0-495a-85d9-bc2420c9ef5a{fill:none;stroke:#333;stroke-linecap:round;stroke-miterlimit:10;}</style></defs><title>tangent</title><path class="ac405426-a6c9-45ca-9e0e-ccf1136aba0e" d="M101.73,25.8A5,5,0,0,1,103,22.36a4.74,4.74,0,0,1,3.06-1.66,4.61,4.61,0,0,1,.55-.05,4.55,4.55,0,0,1,3.32,1.41,5.11,5.11,0,0,1,1.54,3.72,6,6,0,0,1-.11,1,4.64,4.64,0,0,1-1.25,2.41,4.72,4.72,0,0,1-3.5,1.51,5.1,5.1,0,0,1-1.17-.13,4.8,4.8,0,0,1-2.68-1.75A4.85,4.85,0,0,1,101.73,25.8ZM107,21.49a1.58,1.58,0,0,0-.35,0,3,3,0,0,0-1.25.26,2.87,2.87,0,0,0-1.48,2.4c0,.26,0,.73,0,1.41a7.51,7.51,0,0,0,.42,3,2.41,2.41,0,0,0,2.31,1.34c1.78,0,2.68-1.2,2.68-3.59v-.7a11.33,11.33,0,0,0-.11-1.94A2.61,2.61,0,0,0,107,21.49Z"/><path class="ac405426-a6c9-45ca-9e0e-ccf1136aba0e" d="M112.91,33.76h.31c.57,0,.91-.1,1-.3v-.61c0-.18,0-.4,0-.65s0-.53,0-.86V25.16c0-.42,0-.82,0-1.18s0-.64,0-.85v-.34a.74.74,0,0,0-.32-.57,2.71,2.71,0,0,0-1-.18h-.39v-.51c0-.34,0-.5,0-.5l.22,0,.64,0,.81,0,.82-.06.66-.05.24,0h.06v.58l0,.57.17-.16a5.11,5.11,0,0,1,3-1,4,4,0,0,1,.7,0,4.28,4.28,0,0,1,2.58,1.65,5.16,5.16,0,0,1,1,3.26c0,.27,0,.53,0,.77A5.09,5.09,0,0,1,122.49,29a5.17,5.17,0,0,1-2.19,1.54,4.21,4.21,0,0,1-1.36.22,3.94,3.94,0,0,1-2.64-1l-.18-.15V31.5c0,1.27,0,1.93,0,2a.53.53,0,0,0,.27.24,8.27,8.27,0,0,0,1.07.06h.36v1h-.18a20.09,20.09,0,0,0-2.46-.07,20.19,20.19,0,0,0-2.47.07h-.17v-1Zm8.53-8a5.25,5.25,0,0,0-.67-2.68,2.42,2.42,0,0,0-1.64-1.34H119l-.16,0a3.39,3.39,0,0,0-2.71,1.43v5.26a2.74,2.74,0,0,0,2.46,1.59,2.23,2.23,0,0,0,1.68-.82A4.71,4.71,0,0,0,121.44,25.71Z"/><path class="ac405426-a6c9-45ca-9e0e-ccf1136aba0e" 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function cosineSVG() {
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}
function sineSVG() {
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