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/_shared/math/collision.js | 23 ++++++++++++++++++
 frontend/_shared/math/line2.js     | 49 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 frontend/_shared/math/collision.js
 create mode 100644 frontend/_shared/math/line2.js

(limited to 'frontend/_shared/math')

diff --git a/frontend/_shared/math/collision.js b/frontend/_shared/math/collision.js
new file mode 100644
index 0000000..74ec5d8
--- /dev/null
+++ b/frontend/_shared/math/collision.js
@@ -0,0 +1,23 @@
+/// <reference path="vec2.js" />
+/// <reference path="line2.js" />
+/// <reference path="circle.js" />
+/// <reference path="mat4.js" />
+
+/**
+ * 
+ * @param {circle} pCricle 
+ * @param {line2} pLine 
+ */
+function lineCircleCollision2(pCricle, pLine) {
+    // We have a triangle formed by circle's position P and the two points of the line, A and B.
+    var lSlope = (pCricle.position.y - pLine.start.y) / (pCricle.position.x - pLine.start.x),
+        lAngle = Math.atan(lSlope),
+        lAngleDiff = lAngle - pLine.angle,
+        lPositionToStart = subVec2(pCricle.position, pLine.start),
+        lPosToStartLength = length2(lPositionToStart),
+        lHeight = lPosToStartLength * Math.sin(lAngleDiff);
+
+    if (Math.abs(lHeight - pCricle.radius) < pCricle.radius) {
+        console.log('Intersection');
+    }
+}
\ No newline at end of file
diff --git a/frontend/_shared/math/line2.js b/frontend/_shared/math/line2.js
new file mode 100644
index 0000000..d8ab096
--- /dev/null
+++ b/frontend/_shared/math/line2.js
@@ -0,0 +1,49 @@
+/// <reference path="vec2.js" />
+/// <reference path="mat4.js" />
+
+/**
+ * Creates a new line object
+ * @param {vec2} pStart 
+ * @param {vec2} pEnd 
+ * @param {WebGLRenderingContext} pGl
+ */
+function line2(pStart, pEnd, pGl, pColor, pThickness) {
+    const lDiffVector = subVec2(pEnd, pStart);
+
+    const lBuffer = pGl.createBuffer();
+    pGl.bindBuffer(pGl.ARRAY_BUFFER, lBuffer);
+
+    var lBufferedData = [
+        pStart.x, pStart.y, pColor.x, pColor.y, pColor.z, pColor.w,
+        pEnd.x, pEnd.y, pColor.x, pColor.y, pColor.z, pColor.w
+    ];
+
+    pGl.bufferData(pGl.ARRAY_BUFFER, new Float32Array(lBufferedData), pGl.STATIC_DRAW)
+    pGl.bindBuffer(pGl.ARRAY_BUFFER, undefined);
+
+    var lSlope = (pEnd.y - pStart.y) / (pEnd.x - pStart.x);
+
+    return {
+        buffer: lBuffer,
+        start: pStart,
+        end: pEnd,
+        slope: lSlope,
+        angle: Math.atan(lSlope),
+        length: length2(lDiffVector),
+        direction: normalize2(lDiffVector)
+    };
+}
+
+function renderLine2(pGl, pProgramInfo, pLine) {
+    pGl.uniformMatrix4fv(pProgramInfo.uniformLocations.model, false, mat4()); // Model on a line is always default matrix
+    pGl.bindBuffer(pGl.ARRAY_BUFFER, pLine.buffer);
+    {
+        pGl.enableVertexAttribArray(pProgramInfo.attributeLocations.position);
+        pGl.vertexAttribPointer(pProgramInfo.attributeLocations.position, 2, pGl.FLOAT, false, BYTES_PER_FLOAT * 6, 0);
+
+        pGl.enableVertexAttribArray(pProgramInfo.attributeLocations.color);
+        pGl.vertexAttribPointer(pProgramInfo.attributeLocations.color, 4, pGl.FLOAT, false, BYTES_PER_FLOAT * 6, BYTES_PER_FLOAT * 2);
+    }
+
+    pGl.drawArrays(pGl.LINES, 0, 2);
+}
\ No newline at end of file
-- 
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