From 026abdb98ad30209df0e88795f25b1f74556585e Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <matthew.kosarek@vention.cc>
Date: Thu, 25 Feb 2021 20:50:12 -0500
Subject: Updated the sidebar for usability's sake

---
 frontend/2d/_rigidbody/rigidbody_1.js | 117 ++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 frontend/2d/_rigidbody/rigidbody_1.js

(limited to 'frontend/2d/_rigidbody/rigidbody_1.js')

diff --git a/frontend/2d/_rigidbody/rigidbody_1.js b/frontend/2d/_rigidbody/rigidbody_1.js
new file mode 100644
index 0000000..e49c7c9
--- /dev/null
+++ b/frontend/2d/_rigidbody/rigidbody_1.js
@@ -0,0 +1,117 @@
+/// <reference path="../../scripts/jquery-3.5.1.min.js"/>
+/// <reference path="../../_shared/math/vec2.js" />
+/// <reference path="../../_shared/math/mat4.js" />
+/// <reference path="../../_shared/2d/shader.js" />
+/// <reference path="../../_shared/math/circle.js" />
+/// <reference path="../../_shared/2d/program_common.js" />
+
+(function() {
+
+    function main() {
+        // Define Constants
+        const CIRCLE_RADIUS = 16;
+        const GRAVITY = 9.8;
+    
+        // Retrieve context
+        const lProgramContext = getContext('#rigidbody_1');
+    
+        if (lProgramContext.gl === null) {
+            console.error('Unable to initialize WebGL. Your browser or machine may not support it.');
+            return;
+        }
+    
+        lProgramContext.gl.clearColor(0.0, 0.0, 0.0, 1.0);
+        lProgramContext.gl.clear(lProgramContext.gl.COLOR_BUFFER_BIT);
+    
+        function run() {
+            console.log('Running Rigid Body 1');
+            lProgramContext.load().then(function(pProgramInfo) {
+                const lCircle = circle(lProgramContext.gl, CIRCLE_RADIUS, 30, [{ x: 0.3, y: 0.3, z: 0.3, w: 1 }], vec2(lProgramContext.width / 2.0, lProgramContext.height / 2.0));
+                
+                function update(pDeltaTimeSeconds) {
+                    // Physics updates
+                    const lGravityForce = vec2(0, -1.0 * (lCircle.mass * GRAVITY));
+    
+                    // Add up the forces acting on the circle
+                    lCircle.force = addVec2(lCircle.force, lGravityForce);
+    
+                    // Figure out acceleration (a = F / m)
+                    const lCurrentAcceleration = scaleVec2(lCircle.force, 1.0 / lCircle.mass);
+    
+                    // Calculate the new velocity: v = v0 + a * t
+                    lCircle.velocity = addVec2(lCircle.velocity, scaleVec2(lCurrentAcceleration, pDeltaTimeSeconds));
+    
+                    // Update the position based on velocity: x = x0 + v * t
+                    lCircle.position = addVec2(lCircle.position, scaleVec2(lCircle.velocity, pDeltaTimeSeconds));
+    
+                    // Update the model matrix accordingly
+                    lCircle.model = translateMatrix(mat4(), lCircle.position.x, lCircle.position.y, 0);
+    
+                    // Report the current state to the frontend
+                    $('#rigidbody_1_force_field').text(vec2str(lCircle.force));
+                    $('#rigidbody_1_acceleration_field').text(vec2str(lCurrentAcceleration));
+                    $('#rigidbody_1_velocity_field').text(vec2str(lCircle.velocity));
+                    $('#rigidbody_1_position_field').text(vec2str(lCircle.position));
+    
+                    // Reset the circle's force vector
+                    lCircle.force = vec2();
+    
+                    // Render Code only
+                    lProgramContext.gl.clearColor(0.0, 0.0, 0.0, 1.0);  // Clear to black, fully opaque
+                    lProgramContext.gl.clearDepth(1.0);                 // Clear everything
+                    lProgramContext.gl.enable(lProgramContext.gl.DEPTH_TEST);           // Enable depth testing
+                    lProgramContext.gl.depthFunc(lProgramContext.gl.LEQUAL);            // Near things obscure far things
+                    lProgramContext.gl.clear(lProgramContext.gl.COLOR_BUFFER_BIT | lProgramContext.gl.DEPTH_BUFFER_BIT);
+    
+                    lProgramContext.gl.useProgram(pProgramInfo.program);
+                    lProgramContext.gl.uniformMatrix4fv(pProgramInfo.uniformLocations.projection, false, lProgramContext.perspective);
+                    lProgramContext.gl.uniformMatrix4fv(pProgramInfo.uniformLocations.model, false, lCircle.model);
+    
+                    renderCircle(lProgramContext.gl, pProgramInfo, lCircle);
+                }
+    
+                function addForce(ev) {
+                    ev.preventDefault();
+                    ev.stopPropagation();
+    
+                    let lXValue = $(this).find('.vec2_x_input').val(),
+                        lYValue = $(this).find('.vec2_y_input').val();
+    
+                    if (lXValue.length === 0) {
+                        lXValue = 0;
+                    }
+    
+                    if (lYValue.length === 0) {
+                        lYValue = 5000;
+                    }
+    
+                    console.log('Applying force: ' + lXValue + ', ' + lYValue);
+                    lCircle.force = addVec2(lCircle.force, vec2(Number(lXValue), Number(lYValue)));
+                }
+    
+                function cleanup() {
+                    lProgramContext.gl.deleteBuffer(lCircle.buffer);
+                    lProgramContext.gl.deleteProgram(pProgramInfo.program);
+                    lProgramContext.gl.clearColor(0.0, 0.0, 0.0, 1.0);
+                    lProgramContext.gl.clear(lProgramContext.gl.COLOR_BUFFER_BIT);
+                }
+    
+                function reset() {
+                    lExitRequestFunc();
+                    lProgramContext.reset();
+                    $('#rigidbody_1_force_submit_button').unbind('submit').submit(false);
+                }
+    
+                const lExitRequestFunc = requestUpdateLoop(update, cleanup);
+                lProgramContext.stopButton.on('click', reset);
+                $('#rigidbody_1_force_submit_button').submit(addForce);
+            });
+        }
+    
+        lProgramContext.playButton.on('click', run);
+        $('#rigidbody_1_force_submit_button').submit(false);
+    
+    }
+    
+    $(document).ready(main);
+})()
\ No newline at end of file
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