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leap-test-2.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Leap Test 2 - with Moving Average</title>
<meta name="description" content="Leap Test 1">
<meta name="author" content="Bill Fisher">
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
#avatar {
height:30px;
width: 30px;
background: #f00;
-webkit-border-radius: 50%;
position: absolute;
}
</style>
<script src="js/leap.js"></script>
</head>
<body>
<h1>Leap Test 2 - with Moving Average</h1>
<div id="pointable-data"></div>
<div id="avatar"></div>
<script>
var dataContainer = document.getElementById("pointable-data");
var avatar = document.getElementById("avatar");
var docWidth = document.width;
var docHeight = document.height;
avatar.style.left = (docWidth / 2) - (avatar.offsetWidth / 2) + "px";
avatar.style.top = (docHeight / 2) - (avatar.offsetHeight / 2) + "px";
// comparator
//
// Get a comparator function for use with an array of objects or an array of arrays.
//
// @param property String the object property or array index to compare.
var comparator = function (property) {
return function (a, b) {
if (a[property] < b[property]) return -1;
if (a[property] > b[property]) return 1;
return 0;
}
};
// convert
//
// Converts a number in range A to a number in range B.
//
// @param aRangeVal Number
// @param aRange Array [min, max]
// @param bRange Array [min, max]
var convert = function (aRangeVal, aRange, bRange) {
return ((aRangeVal - aRange[0]) / (aRange[1] - aRange[0])) * (bRange[1] - bRange[0]) + bRange[0];
};
var vectorToString = function (vector, digits) {
if (typeof digits === "undefined") {
digits = 1;
}
return "(" + vector[0].toFixed(digits) + ", "
+ vector[1].toFixed(digits) + ", "
+ vector[2].toFixed(digits) + ")";
};
var propertyAverage = function (arr, property) {
//console.log(arr);
var total = 0;
var i = 0;
var len = arr.length;
for (; i<len; i+=1) {
total += arr[i][property];
}
return parseInt(total / arr.length, 10);
};
// Store frame data for motion functions
var previousFramesData = [];
// Track one pointer as the primary pointer
var primaryPointableId;
// Setup Leap loop with frame callback function
var controllerOptions = {enableGestures: false};
Leap.loop(controllerOptions, function(frame) {
if (!primaryPointableId || !frame.pointable(primaryPointableId).valid) {
primaryPointableId = frame.pointables.length ? frame.pointables.sort(comparator("length"))[0].id : "-1"
}
var pointable = frame.pointable(primaryPointableId);
if (pointable.valid) {
var pointableString = "<div>";
pointableString += "Pointable ID: " + pointable.id + "<br />";
pointableString += "Belongs to hand with ID: " + pointable.handId + "<br />";
if (pointable.tool) {
pointableString += "Classified as a tool <br />";
pointableString += "Length: " + pointable.length.toFixed(1) + " mm<br />";
pointableString += "Width: " + pointable.width.toFixed(1) + " mm<br />";
}
else {
pointableString += "Classified as a finger<br />";
pointableString += "Length: " + pointable.length.toFixed(1) + " mm<br />";
}
pointableString += "Direction: " + vectorToString(pointable.direction, 2) + "<br />";
pointableString += "Tip position: " + vectorToString(pointable.tipPosition) + " mm<br />";
pointableString += "Tip velocity: " + vectorToString(pointable.tipVelocity) + " mm/s<br />";
var direction = pointable.direction;
var directionX = parseInt(direction[0] * 100, 10);
var directionY = parseInt(direction[1] * -100, 10);
var position = pointable.tipPosition;
var positionX = parseInt(position[0], 10);
var positionY = parseInt(position[1], 10);
var positionRangeX = [-200, 200];
var positionRangeY = [20, 400];
var translateRangeX = [(docWidth / 2) * -1, (docWidth / 2)];
var translateRangeY = [(docHeight / 2), (docHeight / 2) * -1];
// now i am realizing that i need to take the average direction from the last three frames or something, so i can get more stability.
var avgPositionX = propertyAverage(previousFramesData, "positionX");
var avgPositionY = propertyAverage(previousFramesData, "positionY");
var avgDirectionX = propertyAverage(previousFramesData, "directionX");
var avgDirectionY = propertyAverage(previousFramesData, "directionY");
var directionXFactor = convert(avgPositionY, [400, 20], [5, 10]);
pointableString += "<br /><br />directionX: " + directionX + "<br />";
pointableString += "<br />directionY: " + directionY + "<br />";
pointableString += "<br />positionX: " + positionX + "<br />";
pointableString += "<br />positionY: " + positionY + "<br />";
pointableString += "<br />translateRangeX: " + translateRangeX + "<br />";
pointableString += "<br />translateRangeY: " + translateRangeY + "<br />";
pointableString += "<br />avgPositionX: " + avgPositionX + "<br />";
pointableString += "<br />avgPositionY: " + avgPositionY + "<br />";
pointableString += "<br />avgDirectionX: " + avgDirectionX + "<br />";
pointableString += "<br />avgDirectionY: " + avgDirectionY + "<br />";
pointableString += "Direction X factor: " + directionXFactor + "<br /><br />";
pointableString += "previousFramesData length: " + previousFramesData.length + "<br /><br />";
var translateX = parseInt(convert(avgPositionX, positionRangeX, translateRangeX) + (avgDirectionX * directionXFactor), 10) + "px";
var translateY = parseInt(convert(avgPositionY, positionRangeY, translateRangeY) + (avgDirectionY * 5), 10) + "px";
pointableString += "translateX: " + translateX + " <br />";
pointableString += "translateY: " + translateY + " <br />";
avatar.style.visibility = "visible";
avatar.style.webkitTransform = "translate3d(" + translateX + ", " + translateY + ", 0)";
pointableString += "</div>";
if (previousFramesData.length > 9) {
previousFramesData.shift();
}
previousFramesData.push({
directionX: directionX,
directionY: directionY,
positionX: positionX,
positionY: positionY
});
}
else {
var pointableString = "no data";
avatar.style.visibility = "hidden";
avatar.style.webkitTransform = "translate3d(0, 0, 0)";
}
dataContainer.innerHTML = pointableString;
});
</script>
</body>
</html>