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HTML

              
                <div class="ad-App" id="app"></div>
              
            
!

CSS

              
                @use cssnext;
@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,400italic,600,600italic);

:root {
    --colorPalette-1: #37474F;
    --colorPalette-2: #263238;
    --colorPalette-3: #00BCD4;
}

::-webkit-scrollbar {
    width: .5rem;
}
::-webkit-scrollbar-thumb {
    background: var(--colorPalette-1);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: color(var(--colorPalette-1) l(+5%));
}

html {
    font-size: 16px;
}

html, body {
    height: 100%;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

.ad-Icon {
    width: 1.5em;
    height: 1.5em;
    color: currentColor;
}
    .ad-Icon path {
        fill: currentColor;
    }

.ad-Button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: .7rem 1rem;
    border: 2px solid var(--colorPalette-1);
    border-radius: 4px;
    background: none;
    cursor: pointer;
    transition: border .1s,
        background .1s,
        color .1s;
    font-size: .7rem;
    color: var(--colorPalette-1);
}
.ad-Button:focus {
    outline: 0;
}
.ad-Button--full {
    width: 100%;
}
.ad-Button--mini {
    padding: .25rem;
    font-size: .5rem;
}
.ad-Button--primary {
    border-color: var(--colorPalette-3);
    color: var(--colorPalette-3);
}
.ad-Button--primary:focus,
.ad-Button--primary:hover {
    background: var(--colorPalette-3);
    color: #fff;
}
.ad-Button--cancel {
    border-color: #fff;
    color: #fff;
}
.ad-Button--cancel:focus,
.ad-Button--cancel:hover {
    background: #fff;
    color: var(--colorPalette-2);
}
    .ad-Button-text {
        text-transform: uppercase;
        font-family: "Open Sans", sans-serif;
        font-weight: bold;
        color: currentColor;
    }
    .ad-Icon + .ad-Button-text {
        margin-left: .25rem;
    }

.ad-App {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--colorPalette-3);
}
    .ad-App-head {
        margin-bottom: 2rem;
    }
        .ad-App-title {
            font-family: "Open Sans", sans-serif;
            font-weight: bold;
            font-size: 1.05rem;
            color: #fff;
        }
        .ad-App-hint {
            margin-top: .4rem;
            font-family: "Open Sans", sans-serif;
            font-size: .9rem;
            color: #fff;
        }

.ad-App-foot {
    margin-top: 1rem;
    text-transform: uppercase;
    text-align: right;
    font-family: "Open Sans", sans-serif;
    font-weight: bold;
    font-size: .65rem;
}
.ad-App-foot a {
    color: #fff;
    text-decoration: underline;
}

.ad-Trigonometry {
    overflow: hidden;
    display: flex;
    height: 30rem;
    background: var(--colorPalette-1);
    border-radius: 4px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, .4);
}
    .ad-Trigonometry-svg {
        width: 30rem;
        height: 100%;
        padding: 2rem;
    }
    .ad-Trigonometry-form {
        width: 14rem;
        height: 100%;
        background: var(--colorPalette-2);
    }

.ad-Sketch {
    width: 100%;
    height: 100%;
}
    .ad-Sketch-circle {
        stroke: #fff;
        stroke-width: 2px;
        fill: none;
    }
    .ad-Sketch-ortho {
        stroke: color(var(--colorPalette-1) l(+5%));
        stroke-width: 2px;
    }
    .ad-Sketch-hint {
        fill: #fff;
        font-family: "Open Sans", sans-serif;
        font-style: italic;
        font-size: .75rem;
    }
    .ad-Sketch-value {
        fill: #fff;
        font-family: "Open Sans", sans-serif;
        font-weight: bold;
        font-size: .8rem;
    }
    .ad-Sketch-value--c {
        text-anchor: middle;
    }
    .ad-Sketch-value--t {
        alignment-baseline: text-after-edge;
    }
    .ad-Sketch-value--b {
        alignment-baseline: text-before-edge;
    }
    .ad-Sketch-hint--r,
    .ad-Sketch-value--r {
        text-anchor: end;
    }

.ad-SketchAngle:nth-child(5n+1),
.ad-FormGroup:nth-child(5n+1) {
    color: #2196F3;
}
.ad-SketchAngle:nth-child(5n+2),
.ad-FormGroup:nth-child(5n+2) {
    color: #66BB6A;
}
.ad-SketchAngle:nth-child(5n+3),
.ad-FormGroup:nth-child(5n+3) {
    color: #F44336;
}
.ad-SketchAngle:nth-child(5n+4),
.ad-FormGroup:nth-child(5n+4) {
    color: #EC407A;
}
.ad-SketchAngle:nth-child(5n+5),
.ad-FormGroup:nth-child(5n+5) {
    color: #FFEB3B;
}
    .ad-SketchAngle-line {
        stroke: currentColor;
        stroke-width: 2px;
        stroke-linecap: round;
    }
    .ad-SketchAngle-angle {
        opacity: .2;
        fill: currentColor;
    }
    .ad-SketchAngle-trigo {
        stroke: color(var(--colorPalette-1) l(+5%));
        stroke-width: 2px;
        stroke-dasharray: 6, 8;
    }
    .ad-SketchAngle-dot {
        fill: currentColor;
        stroke: #fff;
        stroke-width: 2px;
        transition: stroke .2s,
            stroke-width .2s;
    }
    .ad-SketchAngle-dot.is-dragging {
        stroke: #fff;
        stroke-width: 4px;
    }

.ad-Form {
    height: 100%;
    display: flex;
    flex-direction: column;
}
    .ad-Form-groups {
        flex: 1;
        overflow: auto;
        padding: 1rem 2rem 0;
    }
    .ad-Form-actions {
        padding: 2rem;
    }

.ad-FormGroup {
    width: 100%;
    padding: 1rem 0;
    display: flex;
    align-items: center;
}
.ad-FormGroup + .ad-FormGroup {
    border-top: 1px solid var(--colorPalette-1);
}
    .ad-FormGroup-color {
        width: 12px;
        height: 12px;
        border: 2px solid #fff;
        border-radius: 50%;
        background: currentColor;
    }

.ad-FormMath {
    margin-left: .8rem;
    flex: 1;
    display: flex;
    align-items: center;
}
    .ad-FormMath-frac {
        width: 2.5rem;
        display: flex;
        flex-direction: column;
    }
        .ad-FormMath-n + .ad-FormMath-n {
            margin-top: .25rem;
            padding-top: .25rem;
            border-top: 2px solid #fff;
        }
    
    .ad-FormMath-formula {
        flex: 1;
        margin-left: .4rem;
        cursor: default;
        font-family: "Open Sans", sans-serif;
        font-size: 1.2rem;
        color: #fff;
    }

.ad-FormInput {
    width: 100%;
    padding: .25rem;
    border: none;
    border-radius: 4px;
    background: var(--colorPalette-1);
    transition: background .1s;
    text-align: center;
    font-family: "Open Sans", sans-serif;
    font-size: .85rem;
    color: #fff;
}
.ad-FormInput:focus {
    outline: 0;
    background: color(var(--colorPalette-1) l(+10%));
}
              
            
!

JS

              
                const { Component } = React

class Angle extends Component {    
    handleMouseDown = (e) => {
        this.props.dragStart(e, this.props.index)
    };
    
    render() {
        const {
            angle,
            index,
            isDragging,
            ...props,
        } = this.props

        const sketchHalfSize = props.sketchSize / 2
        
        const numerator = angle.numerator !== "" ? angle.numerator : 1
        const denominator = angle.denominator !== "" ? angle.denominator : 1
        
        const radians = (numerator / denominator) * Math.PI
        const cosRadius = sketchHalfSize + Math.cos(radians) * props.circleRadius
        const sinRadius = sketchHalfSize - Math.sin(radians) * props.circleRadius
        
        const angleRadius = 40
        const cosAngleRadius = sketchHalfSize + Math.cos(radians) * angleRadius
        const sinAngleRadius = sketchHalfSize - Math.sin(radians) * angleRadius
        
        return (
            <g className="ad-SketchAngle">
                <path
                    className="ad-SketchAngle-angle"
                    d={
                        "M " + (sketchHalfSize + angleRadius) + " " + sketchHalfSize +
                        " A " + angleRadius + " " + angleRadius + ", " +
                            (Math.sin(radians) < 0 ? "0, 1, 0" : "0, 0, 0") + ", " +
                            cosAngleRadius + " " + sinAngleRadius +
                        " L " + sketchHalfSize + " " + sketchHalfSize +
                        " Z"
                    } />
                
                <g className="ad-SketchAngle-trigo">
                    <line
                        className="ad-SketchAngle-cos"
                        x1={ sketchHalfSize }
                        y1={ sinRadius }
                        x2={ cosRadius }
                        y2={ sinRadius } />
                    <line
                        className="ad-SketchAngle-sin"
                        x1={ cosRadius }
                        y1={ sketchHalfSize }
                        x2={ cosRadius }
                        y2={ sinRadius } />
                </g>
                
                <line
                    className="ad-SketchAngle-line"
                    x1={ sketchHalfSize }
                    y1={ sketchHalfSize }
                    x2={ sketchHalfSize + props.circleRadius }
                    y2={ sketchHalfSize } />
                <line
                    className="ad-SketchAngle-line"
                    x1={ sketchHalfSize }
                    y1={ sketchHalfSize }
                    x2={ cosRadius }
                    y2={ sinRadius } />
                
                <circle
                    className={
                        "ad-SketchAngle-dot" +
                        (isDragging === index ? " is-dragging" : "")
                    }
                    onMouseDown={ this.handleMouseDown }
                    cx={ cosRadius }
                    cy={ sinRadius }
                    r={ 6 } />
            </g>
        )
    }
}

class Sketch extends Component {
    render() {
        const {
            angles,
            ...props,
        } = this.props
        
        const sketchHalfSize = props.sketchSize / 2
        const svgAngles = angles.map((angle, index) => {
            return (<Angle
                angle={ angle }
                index={ index }
                { ...props } />)
        })

        return (
            <svg
                className="ad-Sketch"
                viewBox={ "0 0 " + props.sketchSize + " " + props.sketchSize }>
                <g className="ad-Sketch-base">
                    <line
                        className="ad-Sketch-ortho"
                        x1={ sketchHalfSize }
                        y1={ 0 }
                        x2={ sketchHalfSize }
                        y2={ props.sketchSize } />
                    <line
                        className="ad-Sketch-ortho"
                        x1={ 0 }
                        y1={ sketchHalfSize }
                        x2={ props.sketchSize }
                        y2={ sketchHalfSize } />
                    
                    <text
                        className="ad-Sketch-hint"
                        x={ sketchHalfSize + 10 }
                        y={ 10 }>
                        sin
                    </text>
                    <text
                        className="ad-Sketch-hint  ad-Sketch-hint--r"
                        x={ props.sketchSize - 5 }
                        y={ sketchHalfSize - 10 }>
                        cos
                    </text>
                    
                    <text
                        className="ad-Sketch-value"
                        x={ sketchHalfSize + props.circleRadius + 15 }
                        y={ sketchHalfSize - 10 }>
                        0
                    </text>
                    <text
                        className="ad-Sketch-value  ad-Sketch-value--r"
                        x={ sketchHalfSize - (props.circleRadius + 15) }
                        y={ sketchHalfSize - 10 }>
                        π
                    </text>
                    <text
                        className="ad-Sketch-value  ad-Sketch-value--c  ad-Sketch-value--t"
                        x={ sketchHalfSize }
                        y={ sketchHalfSize - (props.circleRadius + 10) }>
                        π / 2
                    </text>
                    <text
                        className="ad-Sketch-value  ad-Sketch-value--c  ad-Sketch-value--b"
                        x={ sketchHalfSize }
                        y={ sketchHalfSize + props.circleRadius + 10 }>
                        3π / 2
                    </text>
                    
                    <circle
                        className="ad-Sketch-circle"
                        cx={ sketchHalfSize }
                        cy={ sketchHalfSize }
                        r={ props.circleRadius } />
                </g>
                
                <g className="ad-Sketch-angles">
                    { svgAngles }
                </g>
            </svg>
        )
    }
}

class Icon extends Component {
    render() {
        let path

        switch (this.props.name) {
            case "clear":
                path = "M810 274l-238 238 238 238-60 60-238-238-238 238-60-60 238-238-238-238 60-60 238 238 238-238z"
            break;
            
            case "add":
                path = "M810 554h-256v256h-84v-256h-256v-84h256v-256h84v256h256v84z"
            break;
        }
        
        return (
            <svg
                className="ad-Icon"
                viewBox="0 0 1024 1024">
                <path d={ path } />
            </svg>
        )
    }
}

class Button extends Component {
    render() {
        const {
            type,
            size,
            icon,
            children,
            ...props,
        } = this.props

        return (
            <button
                className={
                    "ad-Button" +
                    (type ? " ad-Button--" + type : "") +
                    (size ? " ad-Button--" + size : "")
                }
                { ...props }
                type="button">
                { icon && (<Icon name={ icon } />) }
                {
                    children && (
                        <span className="ad-Button-text">
                            { children }
                        </span>
                    )
                }
            </button>
        )
    }
}

class FormGroup extends Component {    
    handleNumerator = (e) => {
        this.props.updateNumerator(this.props.index, e.target.value)
    };
    
    handleDenominator = (e) => {
        this.props.updateDenominator(this.props.index, e.target.value)
    };
    
    handleClick = (e) => {
        e.preventDefault()
        
        this.props.deleteFormGroup(this.props.index)
    };

    render() {        
        return (
            <div className="ad-FormGroup">
                <div className="ad-FormGroup-color"></div>
            
                <div className="ad-FormMath">
                    <div className="ad-FormMath-frac">
                        <div className="ad-FormMath-n">
                            <input
                                className="ad-FormInput"
                                ref="numerator"
                                value={ this.props.angle.numerator }
                                onChange={ this.handleNumerator }
                                type="text" />
                        </div>
                        
                        <div className="ad-FormMath-n">
                            <input
                                className="ad-FormInput"
                                ref="denominator"
                                value={ this.props.angle.denominator }
                                onChange={ this.handleDenominator }
                                type="text" />
                        </div>
                    </div>
                    
                    <div className="ad-FormMath-formula">
                        π
                    </div>
                </div>
                
                <div className="ad-FormGroup-action">
                    <Button
                        onClick={ this.handleClick }
                        type="cancel"
                        size="mini"
                        icon="clear" />
                </div>
            </div>
        )
    }
}

class Form extends Component {    
    componentDidUpdate() {
        const n = React.findDOMNode(this.refs.groups)
        
        if (this.props.shouldScroll) {
            n.scrollTop = n.scrollHeight
        }
    }
    
    handleClick = (e) => {
        e.preventDefault()
        
        this.props.addFormGroup()
    };
    
    handleBlur = (e) => {
        this.props.blurAddButton()
    };

    render() {
        const {
            angles,
            addFormGroup,
            ...props,
        } = this.props
        
        let groups = angles.map((angle, index) => {
            return (
                <FormGroup
                    index={ index }
                    angle={ angle }
                    { ...props } />
            )
        })
        
        return (
            <form className="ad-Form">
                <div
                    className="ad-Form-groups"
                    ref="groups">
                    { groups }
                </div>
                
                <div className="ad-Form-actions">
                    <Button
                        onClick={ this.handleClick }
                        onBlur={ this.handleBlur }
                        type="primary"
                        size="full"
                        icon="add">
                        Add angle
                    </Button>
                </div>
            </form>
        )
    }
}

class Trigonometry extends Component {    
    state = {
        isDragging: false,
        shouldScroll: false,
        angles: [
            {
                numerator: 7,
                denominator: 10,
            },
            {
                numerator: 3,
                denominator: 2,
            },
            {
                numerator: 1,
                denominator: 5,
            },
        ],
    };

    updateNumerator = (index, numerator) => {
        if (numerator !== "") {
            numerator = parseFloat(numerator)
        }

        const angles = this.state.angles.map((angle, angleIndex) => {
            if (angleIndex === index) {
                numerator = (numerator !== "" && isNaN(numerator)) ? angle.numerator : numerator
                
                return {
                    numerator: numerator,
                    denominator: angle.denominator,
                }
            }
            
            return angle
        })

        this.setState({ angles })
    };

    updateDenominator = (index, denominator) => {
        if (denominator !== "") {
            denominator = parseFloat(denominator)
            
            if (denominator === 0) {
                denominator = 1
            }
        }

        const angles = this.state.angles.map((angle, angleIndex) => {
            if (angleIndex === index) {
                denominator = (denominator !== "" && isNaN(denominator)) ? angle.denominator : denominator

                return {
                    numerator: angle.numerator,
                    denominator: denominator,
                }
            }

            return angle
        })

        this.setState({ angles })
    };
    
    blurAddButton = () => {
        this.setState({
            shouldScroll: false,
        })
    };
    
    addFormGroup = () => {
        const numerator = 0,
            denominator = 1,
            angles = this.state.angles
        
        angles.push({ numerator, denominator })

        this.setState({
            angles,
            shouldScroll: true,
        })
    };
            
    deleteFormGroup = (index) => {
        let angles = this.state.angles
        
        delete angles[index]
        
        this.setState({ angles })
    };

    drag = (e) => {
        let i = this.state.isDragging
        let sketch = React.findDOMNode(this.refs.sketch).getBoundingClientRect()
        
        if (i !== false) {
            const sketchHalfSize = this.props.sketchSize / 2

            let angles = this.state.angles,
                x = (e.pageX - sketch.left) - sketchHalfSize,
                y = sketchHalfSize - (e.pageY - sketch.top),
                rad = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)),
                sine = y / rad,
                cosine = x / rad,
                theta
            
            theta = Math.acos(cosine)
            
            if (sine < 0) {
                theta = 2 * Math.PI - theta
            }
            
            const f = new Fraction((theta / Math.PI).toFixed(1))

            angles[i] = {
                numerator: f.n,
                denominator: f.d,
            }

            this.setState({ angles })
        }
    };
    
    dragStart = (e, index) => {
        e.preventDefault()

        this.setState({
            isDragging: index,
        })
    };
    
    dragEnd = (e) => {
        this.setState({
            isDragging: false,
        })
    };
    
    render() {       
        return (
            <div>
                <div className="ad-App-head">
                    <h1 className="ad-App-title">
                        Trigonometry Helper
                    </h1>

                    <div className="ad-App-hint">
                        Type values to move an angle or drag it directly on the scheme.
                    </div>
                </div>

                <div
                    className="ad-Trigonometry"
                    onMouseUp={ this.dragEnd }
                    onMouseMove={ this.drag }>
                    <div className="ad-Trigonometry-svg">
                        <Sketch
                            ref="sketch"
                            angles={ this.state.angles }
                            drag={ this.drag }
                            dragStart={ this.dragStart }
                            dragEnd={ this.dragEnd }
                            isDragging={ this.state.isDragging }
                            { ...this.props } />
                    </div>

                    <div className="ad-Trigonometry-form">
                        <Form
                            angles={ this.state.angles }
                            shouldScroll={ this.state.shouldScroll }
                            updateNumerator={ this.updateNumerator }
                            updateDenominator={ this.updateDenominator }
                            blurAddButton={ this.blurAddButton }
                            addFormGroup={ this.addFormGroup }
                            deleteFormGroup={ this.deleteFormGroup } />
                    </div>
                </div>
            
                <div className="ad-App-foot">
                    <a href="https://twitter.com/a_dugois">
                        Follow me on Twitter
                    </a>
                </div>
            </div>
        )
    }
}

React.render(
    <Trigonometry
        circleRadius={ 130 }
        sketchSize={ 26 * 16 } />,
    document.querySelector("#app")
)
              
            
!
999px

Console