From 89131ddd562dc4cd2c5d399ecbfcc42ca4ad4a54 Mon Sep 17 00:00:00 2001
From: rgeorgi <russellgeorgi@gmail.com>
Date: Tue, 31 Aug 2021 19:58:29 -0700
Subject: [PATCH] iPhone accelerometer

---
 accelerometer-iphone.html | 338 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 338 insertions(+)
 create mode 100644 accelerometer-iphone.html
diff --git a/accelerometer-iphone.html b/accelerometer-iphone.html
new file mode 100644
index 0000000..e978bf0
--- /dev/null
+++ b/accelerometer-iphone.html
@@ -0,0 +1,338 @@
+<html>
+    <head>
+        <title>
+            Accelerometer
+        </title>
+        <meta http-equiv="ScreenOrientation" content="autoRotate:disabled"/>
+        <style>
+            html, body {
+                width:  100%;
+                height: 100%;
+                margin: 0px;
+                border: 0;
+                overflow: hidden;
+                display: block;
+            }
+
+            .greenSlider {
+                position: absolute;
+                width: 40%;
+                top: 20%;
+                -webkit-appearance: none;
+                border-radius: 20px;
+                height: 40px;
+                background: #d3d3d3;
+                outline: none;
+                opacity: 0.7;
+                -webkit-transition: .2s;
+                transition: opacity .2s;
+                transform: rotate(-90deg);
+            }
+
+            .greenSlider::-webkit-slider-thumb {
+                -webkit-appearance: none;
+                appearance: none;
+                background: #00ff00;
+                border-radius: 50%;
+                width: 60px;
+                height: 60px;
+                cursor: pointer;
+            }
+
+            t {
+                font-size: 45px;
+                position: absolute;
+                top: 5%;
+                left: 20%;
+                text-align: center;
+                vertical-align: center;
+                transform: translate(-50%, -50%);
+            }
+
+            #valueText {
+                top: 40%;
+            }
+
+            label {
+                font-size: 45px;
+                position: absolute;
+                left: 20%;
+                text-align: center;
+                vertical-align: center;
+                transform: translate(-50%, -50%);
+            }
+
+            input {
+                position: absolute;
+                transform: translate(-50%, -50%);
+                width: 10%;
+                height: 10%;
+            }
+
+            #label {
+                left: 20%;
+                top: 70%;
+            }
+
+            #t1 {
+                left: 20%;
+                top: 75%;
+            }
+
+            #label2 {
+                left: 20%;
+                top: 50%;
+            }
+
+            #t2 {
+                left: 20%;
+                top: 55%;
+            }
+
+            button {
+                position: absolute;
+                height: 10%;
+                right: 10%;
+                top: 50%;
+                font-size: large;
+            }
+        </style>
+        <link rel="shortcut icon" href="http://azgeorgis.net/rmg/favicon.ico" type="image/x-icon">
+    </head>
+    <body>
+        <canvas id="myCanvas" width="1" height="1" style="border:1px solid #ffffff;"></canvas>
+        <form id = "form">
+            <label for="t1" id="label">Graph</label> 
+            <input type="checkbox" id="t1" onclick="t1Click()">
+            <label for="t2" id="label2">Pause</label> 
+            <input type="checkbox" id="t2" onclick="t2Click()">
+        </form>
+        <div class="slidecontainer">
+            <t>Damping</t>
+            <input type="range" min="0" max="0.02" value="0.01" step = "0.001" class="greenSlider" id="dampingSlider">
+            <t id="valueText">0.01</t>
+        </div>
+        <button onclick="getAccel()" id="button">Get Accelerometer Permissions</button>
+        <script>
+        var c = document.getElementById("myCanvas");
+        var ctx = c.getContext("2d");
+        ctx.canvas.width = window.innerWidth;
+        ctx.canvas.height = window.innerHeight;
+
+        function Clear(ctx)
+        {
+            ctx.clearRect(-c.width, -c.height, c.width * 2, c.height * 2);
+        }
+
+        function getAccel(){
+            DeviceMotionEvent.requestPermission().then(response => {
+                if (response == 'granted') {
+                    window.addEventListener("devicemotion", accelerometerUpdate, true);
+                    document.getElementById("button").style.visibility = "hidden";
+                }
+            });
+        }
+        ctx.scale(1.5, 1.5);
+
+        var aX = 0;
+        var aY = 0;
+        var aZ = 0;
+        var yMass = 600;
+        var vMass = 0;
+        var m = 0;
+        var k = 0.05;
+        var xPos = 350;
+        var yPos = 500;
+        var nSteps = 2000;
+        var stepWidth = 0.5;
+        var damping = 0.01;
+        var dampingSlider = document.getElementById("dampingSlider");
+        var clickedOnSpring = false;
+        var drawing = false;
+        var mousePos = { x:0, y:0 };
+        var lastPos = mousePos;
+        var graph = false;
+        var pause = false;
+        var pastPositions = new Array(nSteps);
+
+
+        dampingSlider.oninput = function()
+        {
+            damping = this.value;
+            document.getElementById("valueText").textContent = damping.toString();
+        }
+
+        function t1Click()
+        {
+            graph = !graph;
+        }
+
+        function t2Click()
+        {
+            pause = !pause;
+        }
+
+        function accelerometerUpdate(event) {
+            aX = event.accelerationIncludingGravity.x;
+            aY = event.accelerationIncludingGravity.y;
+            aZ = event.accelerationIncludingGravity.z;
+        }
+
+        function Update()
+        {
+            if (!pause)
+            {
+                Clear(ctx);
+                m += 0.1;
+                if (aY == null)
+                {
+                    aY = 9.8;
+                }
+                vMass += 0.1 * aY - (yMass - yPos) * k * 0.1 - damping * vMass;
+                yMass += vMass;
+                if (graph)
+                {
+                    for (i = nSteps - 1; i > 0; i--)
+                    {
+                        pastPositions[i] = pastPositions[i - 1];
+                    }
+                    pastPositions[0] = yMass;
+                    ctx.strokeStyle = "#ff0000";
+                    ctx.beginPath();
+                    ctx.moveTo(xPos, yMass);
+                    for (i = 1; i < nSteps; i++)
+                    {
+                        ctx.lineTo(xPos + i * stepWidth, pastPositions[i]);
+                    }
+                    ctx.stroke();
+                } else
+                {
+                    pastPositions = new Array(nSteps);
+                }
+                ctx.strokeStyle = "#000000";
+                drawSpring(1, 3, (yMass - yPos) / 18, 200, 10, xPos, yPos, 0.1);
+                ctx.beginPath();
+                ctx.arc(xPos, yMass, 10, 0, Math.PI * 2);
+                ctx.fill();
+                ctx.beginPath();
+                ctx.moveTo(xPos - 12, -c.height);
+                ctx.lineTo(xPos - 12, c.height);
+                ctx.stroke();
+                ctx.beginPath();
+                ctx.moveTo(xPos + 12, -c.height);
+                ctx.lineTo(xPos + 12, c.height);
+                ctx.stroke();
+                if (drawing)
+                {
+                    console.log("Drawing");
+                    if (Math.sqrt(((mousePos.x / 1.5) - xPos) ** 2) <= 100)
+                    {
+                        console.log("mouse");
+                        yMass = mousePos.y / 1.5;
+                        vMass = 0;
+                    }
+                }
+            }
+            setTimeout(Update, 1000/60);
+        }
+
+        Update();
+
+        function drawSpring(a, b, xSize, ySize, numLoops, x, y, tStep)
+        {
+            //Draws coiled spring using prolate cycloid
+            var tStart = Math.PI;
+            var tEnd = (3 * Math.PI / 2) + (2 * Math.PI * numLoops);
+            var yEnd = a * tEnd - b * Math.sin(tEnd);
+            var xEnd = a + b;
+            var yFactor = xSize / xEnd;
+            var xFactor = ySize / yEnd;
+            var xShift = x - a + b * Math.cos(Math.PI / 2);
+            var yShift = y - a * (Math.PI / 2) + b * Math.sin(Math.PI / 2);
+            for (t = tStart; t <= tEnd; t += tStep)
+            {
+                ctx.beginPath();
+                ctx.moveTo(xShift + xFactor * (a - b * Math.cos(t)), yShift + yFactor * (a * t - b * Math.sin(t)));
+                ctx.lineTo(xShift + xFactor * (a - b * Math.cos(t + tStep)), yShift + yFactor * (a * (t + tStep) - b * Math.sin(t + tStep)));
+                ctx.stroke();
+            }
+        }
+
+        window.addEventListener('resize', function(event) {
+            c.width = window.innerWidth;
+            c.height = window.innerHeight;
+            ctx.scale(1.5, 1.5);
+        }, true);
+
+        
+        c.addEventListener("mousedown", function (e) {
+            drawing = true;
+            lastPos = getMousePos(c, e);
+        }, false);
+        c.addEventListener("mouseup", function (e) {
+            drawing = false;
+        }, false);
+        c.addEventListener("mousemove", function (e) {
+            mousePos = getMousePos(c, e);
+        }, false);
+
+        function getMousePos(cDom, mouseEvent) {
+            var rect = cDom.getBoundingClientRect();
+            return {
+                x: mouseEvent.clientX - rect.left,
+                y: mouseEvent.clientY - rect.top
+            };
+        }
+
+        c.addEventListener("touchstart", function (e) {
+            mousePos = getTouchPos(c, e);
+            var touch = e.touches[0];
+            var mouseEvent = new MouseEvent("mousedown", {
+                clientX: touch.clientX,
+                clientY: touch.clientY
+            });
+            c.dispatchEvent(mouseEvent);
+        }, false);
+        c.addEventListener("touchend", function (e) {
+            var mouseEvent = new MouseEvent("mouseup", {});
+            c.dispatchEvent(mouseEvent);
+        }, false);
+        c.addEventListener("touchmove", function (e) {
+            var touch = e.touches[0];
+            var mouseEvent = new MouseEvent("mousemove", {
+                clientX: touch.clientX,
+                clientY: touch.clientY
+            });
+            c.dispatchEvent(mouseEvent);
+        }, false);
+
+        function getTouchPos(cDom, touchEvent) {
+            var rect = cDom.getBoundingClientRect();
+            return {
+                x: touchEvent.touches[0].clientX - rect.left,
+                y: touchEvent.touches[0].clientY - rect.top
+            };
+        }
+
+        document.body.addEventListener("touchstart", function (e) {
+        if (e.target == c) {
+            e.preventDefault();
+        }
+        }, false);
+        document.body.addEventListener("touchend", function (e) {
+        if (e.target == c) {
+            e.preventDefault();
+        }
+        }, false);
+        document.body.addEventListener("touchmove", function (e) {
+        if (e.target == c) {
+            e.preventDefault();
+        }
+        }, false);
+
+        </script>
+    </body>
+    <p xmlns:cc="http://creativecommons.org/ns#" style="font-size: 2vw; bottom: 0px; position: absolute;">
+        This work is licensed under 
+        <a href="http://creativecommons.org/licenses/by-nc-nd/4.0/?ref=chooser-v1" target="_blank" rel="license noopener noreferrer" style="display:inline-block;">CC BY-NC-ND 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/nc.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/nd.svg?ref=chooser-v1"></a></p>
+</html>
\ No newline at end of file
