cag · December 13, 2019 21:53
diff --git a/lmsr-bid-ask-chart.html b/lmsr-bid-ask-chart.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
 <title>LMSR Bid/Ask Chart</title>

 <main style="max-width: 960px; margin: auto;">
  <h1>LMSR Bid/Ask Chart</h1>
  <form>
    <ul>
      <li>
        <label for="num-outcomes"># Outcomes:</label>
        <input type="number" id="num-outcomes" value="2" min="2" step="1">
      </li>
      <li>
        <label for="funding">Funding:</label>
        <input type="number" id="funding" value="1000">
      </li>
      <li>
        <label for="odds">Est. Odds for Outcome:</label>
        <input type="range" id="odds" min="0.01" max=".99" step="0.01" value="0.5">
        <output id="odds-display"></output>
      </li>
    </ul>
  </form>
  <canvas id="my-chart"></canvas>
 </main>

 <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/Chart.min.js" integrity="sha256-R4pqcOYV8lt7snxMQO/HSbVCFRPMdrhAFMH+vr9giYI=" crossorigin="anonymous"></script>
 <script>
 // Credit David Walsh (https://davidwalsh.name/javascript-debounce-function)

 // Returns a function, that, as long as it continues to be invoked, will not
 // be triggered. The function will be called after it stops being called for
 // N milliseconds. If `immediate` is passed, trigger the function on the
 // leading edge, instead of the trailing.
 function debounce(func, wait, immediate) {
  let timeout;

  return function executedFunction() {
    const args = arguments;
      
    const later = () => {
      timeout = null;
      if (!immediate) func.apply(this, args);
    };

    const callNow = immediate && !timeout;
  
    clearTimeout(timeout);

    timeout = setTimeout(later, wait);
  
    if (callNow) func.apply(this, args);
  };
 };

 const numOutcomesInput = document.querySelector('#num-outcomes')
 const fundingInput = document.querySelector('#funding')
 const oddsInput = document.querySelector('#odds')

 const buyData = new Array(100)
 const sellData = new Array(100)

 function refreshData() {
  const numOutcomes = parseInt(numOutcomesInput.value)
  const funding = parseFloat(fundingInput.value)
  const odds = parseFloat(oddsInput.value)

  const priceForAmount = (amount) =>
    funding * Math.log(
      (Math.pow(numOutcomes, amount / funding) - 1) * odds + 1
    ) /
    (amount * Math.log(numOutcomes))

  for (let i = 0; i < buyData.length; i++) {
    const y = i * funding / 10
    if(i === 0) {
      buyData[i] = { x: odds, y: 0 }
      sellData[i] = { x: odds, y: 0 }
    } else {
      buyData[i] = { x: priceForAmount(-y), y }
      sellData[i] = { x: priceForAmount(y), y }
    }
  }

 }
 refreshData()

 const ctx = document.getElementById('my-chart').getContext('2d');
  console.log(buyData[2], sellData[2])
 const myChart = new Chart(ctx, {
  type: 'line',
  data: {
    datasets: [{
      label: "MM's BID",
      fill: false,
      borderColor: 'rgb(132, 255, 99)',
      data: buyData,
    }, {
      label: "MM's ASK",
      fill: false,
      borderColor: 'rgb(255, 99, 132)',
      data: sellData,
    }]
  },
  options: {
    elements: {
      line: {
        tension: 0
      }
    },
    scales: {
      xAxes: [{
        scaleLabel: {
          display: true,
          labelString: 'Average OT price',
        },
        type: 'linear',
        ticks: {
          min: 0,
          max: 1,
        }
      }],
      yAxes: [{
        scaleLabel: {
          display: true,
          labelString: 'OT Quantity',
        },
        type: 'linear',
        ticks: {
          min: 0,
        }
      }],
    }
  }
 });

 const oddsDisplay = document.querySelector('#odds-display')

 oddsDisplay.textContent = (oddsInput.value * 100).toFixed(0) + '%'

 const updateGraph = debounce(() => {
  refreshData()
  myChart.update()
 }, 200);

 numOutcomesInput.oninput = updateGraph
 fundingInput.oninput = updateGraph

 oddsInput.oninput = function() {
  oddsDisplay.textContent = (oddsInput.value * 100).toFixed(0) + '%'
  updateGraph()
 }
 </script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
	<title>LMSR Bid/Ask Chart</title>

	<main style="max-width: 960px; margin: auto;">
	<h1>LMSR Bid/Ask Chart</h1>
	<form>
	<ul>
	<li>
	<label for="num-outcomes"># Outcomes:</label>
	<input type="number" id="num-outcomes" value="2" min="2" step="1">
	</li>
	<li>
	<label for="funding">Funding:</label>
	<input type="number" id="funding" value="1000">
	</li>
	<li>
	<label for="odds">Est. Odds for Outcome:</label>
	<input type="range" id="odds" min="0.01" max=".99" step="0.01" value="0.5">
	<output id="odds-display"></output>
	</li>
	</ul>
	</form>
	<canvas id="my-chart"></canvas>
	</main>

	<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/Chart.min.js" integrity="sha256-R4pqcOYV8lt7snxMQO/HSbVCFRPMdrhAFMH+vr9giYI=" crossorigin="anonymous"></script>
	<script>
	// Credit David Walsh (https://davidwalsh.name/javascript-debounce-function)

	// Returns a function, that, as long as it continues to be invoked, will not
	// be triggered. The function will be called after it stops being called for
	// N milliseconds. If `immediate` is passed, trigger the function on the
	// leading edge, instead of the trailing.
	function debounce(func, wait, immediate) {
	let timeout;

	return function executedFunction() {
	const args = arguments;

	const later = () => {
	timeout = null;
	if (!immediate) func.apply(this, args);
	};

	const callNow = immediate && !timeout;

	clearTimeout(timeout);

	timeout = setTimeout(later, wait);

	if (callNow) func.apply(this, args);
	};
	};

	const numOutcomesInput = document.querySelector('#num-outcomes')
	const fundingInput = document.querySelector('#funding')
	const oddsInput = document.querySelector('#odds')

	const buyData = new Array(100)
	const sellData = new Array(100)

	function refreshData() {
	const numOutcomes = parseInt(numOutcomesInput.value)
	const funding = parseFloat(fundingInput.value)
	const odds = parseFloat(oddsInput.value)

	const priceForAmount = (amount) =>
	funding * Math.log(
	(Math.pow(numOutcomes, amount / funding) - 1) * odds + 1
	) /
	(amount * Math.log(numOutcomes))

	for (let i = 0; i < buyData.length; i++) {
	const y = i * funding / 10
	if(i === 0) {
	buyData[i] = { x: odds, y: 0 }
	sellData[i] = { x: odds, y: 0 }
	} else {
	buyData[i] = { x: priceForAmount(-y), y }
	sellData[i] = { x: priceForAmount(y), y }
	}
	}

	}
	refreshData()

	const ctx = document.getElementById('my-chart').getContext('2d');
	console.log(buyData[2], sellData[2])
	const myChart = new Chart(ctx, {
	type: 'line',
	data: {
	datasets: [{
	label: "MM's BID",
	fill: false,
	borderColor: 'rgb(132, 255, 99)',
	data: buyData,
	}, {
	label: "MM's ASK",
	fill: false,
	borderColor: 'rgb(255, 99, 132)',
	data: sellData,
	}]
	},
	options: {
	elements: {
	line: {
	tension: 0
	}
	},
	scales: {
	xAxes: [{
	scaleLabel: {
	display: true,
	labelString: 'Average OT price',
	},
	type: 'linear',
	ticks: {
	min: 0,
	max: 1,
	}
	}],
	yAxes: [{
	scaleLabel: {
	display: true,
	labelString: 'OT Quantity',
	},
	type: 'linear',
	ticks: {
	min: 0,
	}
	}],
	}
	}
	});

	const oddsDisplay = document.querySelector('#odds-display')

	oddsDisplay.textContent = (oddsInput.value * 100).toFixed(0) + '%'

	const updateGraph = debounce(() => {
	refreshData()
	myChart.update()
	}, 200);

	numOutcomesInput.oninput = updateGraph
	fundingInput.oninput = updateGraph

	oddsInput.oninput = function() {
	oddsDisplay.textContent = (oddsInput.value * 100).toFixed(0) + '%'
	updateGraph()
	}
	</script>