here to learn
mathjax-editing.jshighlightjs for LeanConnect Observable notebooks to Lean on your computer with websocketdCindyJS import exampleTOCD3 ScatterplotD3 Log-Scaled HistogramLean exercise boxStepping through currying in LeanHello, Lean prover!MathJaxPolygon inputHello, cubic-spline!Brython in observableHello, Bokeh.js!commentOnLabeling connected componentsDrag to re-arrange (vertical edition)Dynamic import polyfillHello, R on OpenCPU!Hello, noUiSlider!Hello, CindyJS!Hello, chess!
Grid inputs
viewof test = grid()
viewof test2 = grid(
{numStates:4,
init:[
[0,0,0,1,0],
[0,0,3,2,0],
[0,3,0,0,0],
[1,1,1,1,1]]})
viewof testHex = hexGrid()
{
const div = html`<button id='resetButton'>reset</button><button id='onesButton'>all ones</button>
<button id='invalidButton'>invalid input</button>`;
const resetButton = div.querySelector('#resetButton');
resetButton.onclick = () =>
viewof testHex.dispatchEvent(
new CustomEvent('inputArray'));
const onesButton = div.querySelector('#onesButton');
onesButton.onclick = () =>
viewof testHex.dispatchEvent(
new CustomEvent('inputArray',
{detail:[
[1,1,1,1,1],
[1,1,1,1,1],
[1,1,1,1,1],
[1,1,1,1,1],
[1,1,1,1,1]
]}));
const invalidButton = div.querySelector('#invalidButton');
invalidButton.onclick = () =>
viewof testHex.dispatchEvent(
new CustomEvent('inputArray',
{detail:[
[1,1,1,1,1],
[1,1,1,1,1],
[1,1,1,1,1],
[1,1,1,1,1],
[1,1,1,1]
]}));
return div;
}
viewof testHex2a = hexGrid({shape:'rectangle',
numStates:6,
init:Array.from({length:6}, (d,i) => Array(10).fill(5-i))
})
viewof testHex2b = hexGrid({shape:'rectangle',
numStates:7,
init:[
[6,5,4,3,2,0,6,5,4],
[5,4,3,2,0,6,5,4,3],
[4,3,2,0,6,5,4,3,2],
[3,2,0,6,5,4,3,2,1],
]})
viewof testHex3 = hexGrid(
{shape:'hexagon', nx:7,
init:[
[1,1,0,1,0,0,1], // Note that stuff in the upper left corners ...
[0,0,1,0,0,1,0],
[0,1,0,0,1,0,0],
[1,0,0,1,0,0,1],
[0,0,1,0,0,1,0],
[0,1,0,0,1,0,0],
[1,0,0,1,0,0,1] // and lower right corners is ignored.
// However, it is still checked to make sure it is in bounds!
]})
function grid (config) {
// defaults
config = Object.assign({size:15, numStates:2, margin:2, outline:'#000'}, config);
let {nx, ny, size, numStates, init, margin, colorArray, outline} = config;
// validate init: this is horrible...
if (init !== undefined) {
if (init.some(d => d.length !== init[0].length) ||
init.some(d => d.some(v => v<0 || v >= numStates || v != Math.round(v))))
throw new Error(`init should be undefined or a rectangular matrix with integer entries between 0 and ${numStates-1}`);
if (nx === undefined && ny !== undefined) {
if (ny === init.length)
nx = init[0].length;
else throw new Error(`init length:${init.length} not equal to ny:${ny}`);
} else if (ny === undefined && nx !== undefined) {
if (nx === init[0].length)
ny = init.length;
else throw new Error(`init inner length:${init[0].length} not equal to nx:${nx}`);
}
else if (nx === undefined && ny === undefined) {
ny = init.length;
nx = init[0].length;
}
} else {
if (nx === undefined && ny !== undefined)
nx = ny;
else if (ny === undefined && nx !== undefined)
ny = nx;
else if (nx === undefined && ny === undefined)
ny = nx = 5;
}
if (colorArray === undefined)
colorArray = Array.from({length:numStates}, (d,i) => i === 0 ? '#FFF' :
(i === 1 ? '#000' : d3.schemeSet3[(i-2) % 12]));
// Array of values, start out all 0 if init not defined
const state = init ? init.map(d => d.slice()) : Array.from({length:ny}, d => Array(nx).fill(0));
const svg = d3.select(DOM.svg(nx*(size+2*margin), ny*(size+2*margin)));
const el = svg.node();
const rectData = [];
for (let y=0; y<ny; y++)
for (let x=0; x<nx; x++)
rectData.push({x,y});
const grid = svg.append("g")
.attr("cursor", "pointer")
.selectAll("rect")
.data(rectData)
.join("rect")
.on("click", gridClick)
.attr("x", d => d.x*(size + 2*margin) + margin)
.attr("y", d => d.y*(size + 2*margin) + margin)
.attr("fill", d => colorArray[state[d.y][d.x]])
.attr("stroke", outline)
.attr("width", size)
.attr("height", size);
function gridClick({x,y}) {
state[y][x] = (state[y][x] + 1) % numStates;
this.style.fill = colorArray[state[y][x]];
el.dispatchEvent(new CustomEvent('input'));
}
el.addEventListener('inputArray', ({detail}) => {
if (detail !== null && detail !== undefined) {
if (detail.length === ny &&
detail.every(d => d.length === nx && d.every(v => v < numStates && v >= 0 && v === Math.round(v)))) {
state = detail;
} else
return console.log(`failed inputArray event: ${detail}`);
} else {
state = init ? init.map(d => d.slice()) : Array.from({length:ny}, d => Array(nx).fill(0));
}
el.value = state;
grid.attr("fill", d => colorArray[state[d.y][d.x]]);
el.dispatchEvent(new CustomEvent('input'));
});
el.value = state;
return el;
}
function hexGrid (config) {
const SQRT3_2 = Math.sqrt(3)/2;
// defaults
config = Object.assign({size:15, numStates:2, margin:2, outline:'#000', shape:'parallelogram'}, config);
let {nx, ny, size, numStates, init, margin, colorArray, outline, shape} = config;
// validate shape
if (shape !== 'hexagon' && shape !== 'parallelogram' && shape !== 'rectangle')
throw new Error(`shape must be 'hexagon', 'parallelogram', or 'rectangle'`);
// passing in option hexagon was deprecated and is now removed
const hexagon = shape === 'hexagon';
// validate init: this is horrible...
if (init !== undefined) {
if (init.some(d => d.length !== init[0].length) ||
init.some(d => d.some(v => v<0 || v >= numStates || v != Math.round(v))) ||
(hexagon && init.length !== init[0].length))
throw new Error(`init should be undefined or a ${hexagon ? 'square' : 'rectangular'} matrix with integer entries between 0 and ${numStates-1}`);
if (nx === undefined && ny !== undefined) {
if (ny === init.length)
nx = init[0].length;
else throw new Error(`init length:${init.length} not equal to ny:${ny}`);
} else if (ny === undefined && nx !== undefined) {
if (nx === init[0].length)
ny = init.length;
else throw new Error(`init inner length:${init[0].length} not equal to nx:${nx}`);
}
else if (nx === undefined && ny === undefined) {
ny = init.length;
nx = init[0].length;
}
if (hexagon && nx !== ny)
throw new Error(`init should be undefined or a square matrix and ny and nx should be equal to its size`);
} else {
if (hexagon) {
if (nx === undefined && ny !== undefined)
nx = ny;
else if (ny === undefined && nx !== undefined)
ny = nx;
else if (nx === undefined && ny === undefined)
ny = nx = 5;
if (ny !== nx || ny < 3 || (ny % 2 === 0))
throw Error(`when 'hexagon' is 'true', ny and nx should be odd and equal to each other`);
} else {
if (nx === undefined && ny !== undefined)
nx = ny;
else if (ny === undefined && nx !== undefined)
ny = nx;
else if (nx === undefined && ny === undefined)
ny = nx = 5;
}
}
if (init !== undefined)
if (init.length !== ny || init.some(d => d.length !== nx || d.some(v => v<0 || v >= numStates)))
throw Error(`init should be undefined or an ${ny} by ${nx} with entries from 0 to ${numStates-1}`);
if (colorArray === undefined)
colorArray = Array.from({length:numStates}, (d,i) => i === 0 ? '#FFF' :
(i === 1 ? '#000' : d3.schemeSet3[(i-2) % 12]));
const unitHex = [0,1,2,3,4,5].map(d => {
const ang = Math.PI * (d + (shape === 'rectangle' ? 0 : 0.5)) / 3;
return [Math.cos(ang), Math.sin(ang)];
});
const scale = size*SQRT3_2;
const r = size / Math.sqrt(3);
// Array of values, start out all 0 if init not defined
let state = init ? init.map(d => d.slice()) : Array.from({length:ny}, d => Array(nx).fill(0));
const svg = hexagon ?
d3.select(DOM.svg(nx*(size+2*margin),
nx*(scale+Math.sqrt(3)*margin)+scale/2+Math.sqrt(3)*margin)) :
(shape === 'rectangle' ?
d3.select(DOM.svg(nx*(scale+2*margin) + scale,
ny*(size+2*margin)+size)) :
// parallelogram (default)
d3.select(DOM.svg(nx*(size+2*margin) + ny*(size/2+margin),
ny*(scale+Math.sqrt(3)*margin)+scale/2+Math.sqrt(3)*margin)));
const el = svg.node();
const hexData = [];
if (hexagon) {
for (let y=0; y<(ny+1)/2; y++)
for (let x=(nx-1)/2 - y; x<nx; x++)
hexData.push({x,y});
for (let y=(ny+1)/2; y<ny; y++)
for (let x=0; x<nx-(y-(ny-1)/2); x++)
hexData.push({x,y});
} else
for (let y=0; y<ny; y++)
for (let x=0; x<nx; x++)
hexData.push({x,y});
const grid = svg.append("g")
.attr("cursor", "pointer")
.selectAll("polygon")
.data(hexData)
.join("polygon")
.attr("points", hexPoints)
.on("click", gridClick)
.attr("fill", d => colorArray[state[d.y][d.x]])
.attr("stroke", outline);
function hexPoints({x,y}) {
if (shape === 'rectangle') {
const cx = (scale+margin*Math.sqrt(3))*x + scale/2+Math.sqrt(3)*margin;
const cy = (size+2*margin)*y + size + (x % 2)*(size/2 + SQRT3_2*margin);
return unitHex.map(([x,y]) => `${cx+r*x},${cy+r*y}`).join(' ');
}
const cx = hexagon ?
(size/2+margin)*y + (size+2*margin)*(x-(nx-1)/4) + size/2+margin :
(size/2+margin)*y + (size+2*margin)*x + size/2+2*margin;
const cy = (scale+margin*Math.sqrt(3))*y + scale;
return unitHex.map(([x,y]) => `${cx+r*x},${cy+r*y}`).join(' ');
}
function gridClick({x,y}) {
state[y][x] = (state[y][x] + 1) % numStates;
this.style.fill = colorArray[state[y][x]];
el.dispatchEvent(new CustomEvent('input'));
}
el.addEventListener('inputArray', ({detail}) => {
if (detail !== null && detail !== undefined) {
if (detail.length === ny &&
detail.every(d => d.length === nx && d.every(v => v < numStates && v >= 0 && v === Math.round(v)))) {
state = detail;
} else
return console.log(`failed inputArray event: ${detail}`);
} else {
state = init ? init.map(d => d.slice()) : Array.from({length:ny}, d => Array(nx).fill(0));
}
el.value = state;
grid.attr("fill", d => colorArray[state[d.y][d.x]]);
el.dispatchEvent(new CustomEvent('input'));
});
el.value = state;
return el;
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.