Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <div class="wrap">
            <div><canvas id="mycanvas"></canvas></div>
        </div>
        <div class="wrap2">
            <div><canvas id="mycanvas2"></canvas></div>
        </div>
              
            
!

CSS

              
                

* {
    padding: 0;
    margin: 0;
    /* overflow: hidden; */
}

.wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5%;
    height: 100vh;
    position: relative;
    z-index: 2;
   
}

.wrap div {
    box-shadow: 2px 2px 6px -2px rgba(0,0,0,0.75);
}

.wrap2 {
    padding: 0 5%;
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    top: 0;
    left: 0;
    z-index: 1;
    background-color: 'white'
}

#mycanvas {
    display: block;
    box-sizing: border-box;
    border: 1px solid hsl(259, 100%, 65%)
}
#mycanvas2 {
    display: block;
    box-sizing: border-box;
}

.pointer {
    cursor: pointer;
}

li.pass {
    color: green
}

li.fail {
    color: red
}
              
            
!

JS

              
                
let hsl = (h, s, l) => `hsl(${h},${s}%,${l}%)`

let drawCoords = (ctx, x, y, color = "green") => {
    ctx.save()
    ctx.translate(x, y)
    ctx.fillStyle = color
    ctx.fillRect(-45, -7, 30, 14)
    ctx.fillStyle = 'white'
    ctx.fillText(Math.floor(x), -30, 0)
    ctx.rotate(Math.PI / 2)
    ctx.fillStyle = color
    ctx.fillRect(-45, -7, 30, 14)
    ctx.fillStyle = 'white'
    ctx.fillText(Math.floor(y), -30, 0)
    ctx.restore()
}


let canvas = document.getElementById('mycanvas')
let canvas2 = document.getElementById('mycanvas2')
let ctx = canvas.getContext('2d')
let ctx2 = canvas2.getContext('2d')
let w = canvas.width = canvas2.width = window.innerWidth * 0.9;
let h = canvas.height = canvas2.height = window.innerHeight * 0.9;

canvas.style.backgroundColor = 'transparent'
canvas2.style.backgroundColor = 'yellow'

ctx.lineWidth = 2
ctx.textAlign = 'center'
ctx.textBaseline = 'middle'
ctx.font = '10px Arial'


let drawBG = context => {

    context.save()

    context.fillStyle = 'white'
    context.fillRect(0, 0, w, h)
    context.lineWidth = 0.3;
    context.strokeStyle = 'lightgray'
    context.fillStyle = 'black'

    for (let i = 1; i < w; i++) {
        context.beginPath()
        if (i % 10 === 0) {
            context.moveTo(i, 0);
            context.lineTo(i, h)
            context.moveTo(i, 0);
        }
        context.closePath()
        context.stroke()
    }

    for (let i = 1; i < h; i++) {
        context.beginPath()
        if (i % 10 === 0) {
            context.moveTo(0, i)
            context.lineTo(w, i)
            context.moveTo(0, i)
        }
        context.closePath()
        context.stroke()
    }


    context.lineWidth = 1
    context.strokeStyle = 'gray'

    context.beginPath()
    for (let i = 50; i < w; i += 10) {
        if (i % 50 === 0) {
            context.moveTo(i, 0)
            context.lineTo(i, 30)
            context.fillText(` ${i}`, i, 30)
        } else {
            context.moveTo(i, 0)
            context.lineTo(i, 10)
        }

    }
    context.closePath()
    context.stroke()

    context.beginPath()
    for (let i = 50; i < h; i += 10) {
        if (i % 50 === 0) {
            context.moveTo(0, i)
            context.lineTo(30, i)
            context.fillText(` ${i}`, 30, i)
        } else {
            context.moveTo(0, i)
            context.lineTo(10, i)
        }

    }
    context.closePath()
    context.stroke()

    context.restore()
}

drawBG(ctx2)

class Square {
    constructor(x, y, edge, color) {

        this.x = x
        this.y = y
        this.edge = edge
        this.color = color
        this.selected = false
        this.active = false
        this.activeColor = color.replace(/,\d\d%\)/, str => str.replace(/\d\d/, str.match(/\d\d/)[0] * 0.7))
        this.activeColor2 = color.replace(/,\d\d%\)/, str => str.replace(/\d\d/, str.match(/\d\d/)[0] * 0.6))

    }
    draw(context) {
        context.fillStyle = this.color
        if (this.active) {
            context.fillStyle = this.activeColor;
            context.save()
            context.setLineDash([10, 5, 30, 5])
            context.beginPath()
            context.moveTo(this.x, this.y)
            context.lineTo(0, this.y)
            context.moveTo(this.x, this.y)
            context.lineTo(this.x, 0)
            context.moveTo(this.x, this.y)
            context.closePath()
            context.lineWidth = 0.5
            context.strokeStyle = this.activeColor
            context.stroke()

            drawCoords(context, this.x, this.y, this.activeColor)

            context.restore()
        }
        context.fillRect(this.x, this.y, this.edge, this.edge)
        if (this.selected) {
            context.lineWidth = 2;
            context.strokeStyle = this.activeColor2
            context.strokeRect(this.x, this.y, this.edge, this.edge)
        }
    }
    update() {
        this.x += 0.1
    }

    select() {
        this.selected = !this.selected
    }

    activate() {
        this.active = !this.active
    }
}

let prtcls = new Array(10).fill().map(() => new Square(Math.random() * w, Math.random() * h, 60, hsl(Math.floor(Math.random() * 360), 100, 50)))


let getMouseCoords = (canvas, event) => {
    let canvasCoords = canvas.getBoundingClientRect()
    return {
        x: event.pageX - canvasCoords.left,
        y: event.pageY - canvasCoords.top
    }
}

let getOffsetCoords = (mouse, rect) => {
    return {
        x: mouse.x - rect.x,
        y: mouse.y - rect.y
    }
}





let arr = new Array(40).fill('empty').map(() => Math.floor(Math.random() * 100))

let cursorInRect = (mouseX, mouseY, rectX, rectY, rectW, rectH) => {
    let xLine = mouseX > rectX && mouseX < rectX + rectW
    let yLine = mouseY > rectY && mouseY < rectY + rectH

    return xLine && yLine
}


// =============================================================
//                          HANDLERS
// =============================================================


window.addEventListener('resize', () => {
    w = canvas.width = canvas2.width = window.innerWidth * 0.9;
    h = canvas.height = canvas2.height = window.innerHeight * 0.9;
    drawBG(ctx2)
})

canvas.addEventListener('click', e => {
    let mouse = getMouseCoords(canvas, e)
})

canvas.addEventListener('mousemove', e => {
    let mouse = getMouseCoords(canvas, e)

    let arr = prtcls.map(e => cursorInRect(mouse.x, mouse.y, e.x, e.y, e.edge, e.edge))
    !arr.every(e => e === false) ? canvas.classList.add('pointer') : canvas.classList.remove('pointer')

    prtcls.forEach(e => {

        if (e.selected) {
            e.x = mouse.x - e.offset.x
            e.y = mouse.y - e.offset.y
        }

        cursorInRect(mouse.x, mouse.y, e.x, e.y, e.edge, e.edge) ?
            e.active != true ? e.activate() : false
            : e.active = false
    })



})


canvas.addEventListener('mousedown', e => {
    let mouse = getMouseCoords(canvas, e)
    prtcls.forEach(e => {
        if (cursorInRect(mouse.x, mouse.y, e.x, e.y, e.edge, e.edge)) {
            e.selected = true
            e.offset = getOffsetCoords(mouse, e)
        } else {
            e.selected = false
        }
    })
})

canvas.addEventListener('mouseup', e => {
    prtcls.forEach(e => e.selected = false)
})



// =============================================================
//                          MAIN LOOP
// =============================================================

function animate() {
    ctx.clearRect(0, 0, w, ctx.canvas.height)
    ctx.fillStyle = 'white'
    prtcls.forEach(e => {
        e.draw(ctx)
    })
    window.requestAnimationFrame(animate)
}

animate()


              
            
!
999px

Console