3-8, 3-31, 3-32, and throwing a ball

2021-08-30 15:31:44 -07:00
parent 8ff3055c97
commit d371cc2d51
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+<!--
+    This work is licensed under CC BY-NC-ND 4.0            
+    Link to license: http://creativecommons.org/licenses/by-nc-nd/4.0/
+    Attribute to Russell Georgi
+-->
+<html>
+    <head>
+        <title>
+            Exercise 3-32
+        </title>
+        <style>
+            html, body {
+                width:  100%;
+                height: 100%;
+                margin: 0px;
+                border: 0;
+                overflow: hidden;
+                display: block;
+            }
+
+            canvas {
+                position: absolute;
+            }
+
+        </style>
+    </head>
+    <body>       
+        <canvas id="myCanvas" width="1" height="1" style="border:1px solid #ffffff;">
+        Your browser does not support the HTML5 canvas tag.</canvas>
+        
+        <script>
+        var c = document.getElementById("myCanvas");
+        var ctx = c.getContext("2d");
+        c.width = window.innerWidth;
+        c.height = window.innerHeight;
+        //Time step
+        var dt = 0.002;
+        var t = 0;
+        var g = 98;
+        var m1 = 1;
+        var m2 = 1;
+        var y1 = 0;
+        var y2 = 0;
+        var yp = 0;
+        var v1 = 0;
+        var v2 = 0;
+        var vp = 0;
+        var a1 = -g;
+        var a2 = -g;
+        var ap = -3 * g;
+        var n = 1;
+        var dist = 100;
+        //Relative position of canvas
+        var xPos = 0;
+        var yPos = 200;
+        //Moves and scales canvas
+        ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2)
+        ctx.scale(1, -1);
+        Reset();
+
+        function Clear(ctx)
+        {
+            ctx.clearRect(-c.width, -c.height, c.width * 2, c.height * 2);
+        }
+
+        function Update()
+        {
+            Clear(ctx);
+            Draw();
+            t += dt;
+            v1 += a1 * dt;
+            v2 += a2 * dt;
+            vp += ap * dt;
+            y1 += v1 * dt;
+            y2 += v2 * dt;
+            yp += vp * dt;
+            if (Math.abs(yp - (y2 - dist * 2)) < 20)
+            {
+                Reset();
+            }
+            setTimeout(Update, 5);
+        }
+
+        function Reset()
+        {
+            y1 = 0;
+            y2 = 0;
+            yp = 0;
+            v1 = 0;
+            v2 = 0;
+            vp = 0;
+        }
+    
+        function Draw()
+        {
+            ctx.strokeStyle = '#000000';
+            ctx.beginPath();
+            ctx.moveTo(-c.width, yPos + 50);
+            ctx.lineTo(c.width, yPos + 50);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.moveTo(xPos, yPos + 50);
+            ctx.lineTo(xPos, yPos);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.arc(xPos, yPos, 30, 0, Math.PI * 2);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.moveTo(xPos - 30, yPos - dist + yp);
+            ctx.lineTo(xPos - 30, yPos);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.arc(xPos - 30, yPos - dist + yp, 20, 0, Math.PI * 2);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.moveTo(xPos - 50, yPos - dist + yp);
+            ctx.lineTo(xPos - 50, yPos - dist * 3 + y1);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.arc(xPos - 50, yPos - dist * 3 + y1, 5, 0, Math.PI * 2);
+            ctx.fill();
+            ctx.beginPath();
+            ctx.arc(xPos + 10, yPos - dist * 3 + y2, 20, 0, Math.PI * 2);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.moveTo(xPos - 10, yPos - dist * 3 + y2);
+            ctx.lineTo(xPos - 10, yPos - dist + yp);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.moveTo(xPos + 30, yPos - dist * 3 + y2);
+            ctx.lineTo(xPos + 30, yPos);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.moveTo(xPos + 10, yPos - dist * 3 + y2);
+            ctx.lineTo(xPos + 10, yPos - dist * 3.5 + y2);
+            ctx.stroke();
+            ctx.beginPath();
+            ctx.arc(xPos + 10, yPos - dist * 3.5 + y2, 5, 0, Math.PI * 2);
+            ctx.fill();
+        }
+
+
+        window.addEventListener('resize', function(event) {
+            c.width = window.innerWidth;
+            c.height = window.innerHeight;
+            ctx.translate(c.width / 2, c.height / 2);
+            ctx.scale(1, -1);
+        }, true);
+
+        Update();
+
+        </script>
+    </body>
+    <p xmlns:cc="http://creativecommons.org/ns#" style="font-size: 1vw; 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>