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Diffstat (limited to '_shared/math/circle.js')
| -rw-r--r-- | _shared/math/circle.js | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/_shared/math/circle.js b/_shared/math/circle.js deleted file mode 100644 index ba33021..0000000 --- a/_shared/math/circle.js +++ /dev/null @@ -1,112 +0,0 @@ -/// <reference path="mat4.js" /> -/// <reference path="vec2.js" /> - -const BYTES_PER_FLOAT = 4; - -/** - * Initializes a new circle object for the WebGL context. - * - * @param {WebGLRenderingContext} pGl - * @param {number} pRadius - * @param {number} pSegments - * @param {Array<Vector4>} pColorList - * @param {vec2} pInitialPosition - * @param {number} pMass - */ -function circle(pGl, pRadius, pSegments, pColorList, pInitialPosition, pMass) { - const lBuffer = pGl.createBuffer(); - - pGl.bindBuffer(pGl.ARRAY_BUFFER, lBuffer); - - var lBufferedData = []; - vertexCount = 0; - - const lAngleIncrements = (360.0 / pSegments) * (Math.PI / 180.0); - for (let lSegIdx = 0; lSegIdx < pSegments; lSegIdx++) { - const lAngle = lAngleIncrements * lSegIdx, - lNextAngle = lAngleIncrements * (lSegIdx + 1), - lColorIndex = Math.floor(pColorList.length * (lSegIdx / pSegments)), - lColor = pColorList[lColorIndex]; // TODO: Calculate which one to use - - lBufferedData = lBufferedData.concat([ - 0, 0, lColor.x, lColor.y, lColor.z, lColor.w, - pRadius * Math.sin(lAngle), pRadius * Math.cos(lAngle), lColor.x, lColor.y, lColor.z, lColor.w, - pRadius * Math.sin(lNextAngle), pRadius * Math.cos(lNextAngle), lColor.x, lColor.y, lColor.z, lColor.w - ]); - - vertexCount += 3; - } - - pGl.bufferData(pGl.ARRAY_BUFFER, new Float32Array(lBufferedData), pGl.STATIC_DRAW) - pGl.bindBuffer(pGl.ARRAY_BUFFER, undefined); - - return { - buffer: lBuffer, - vertexCount: vertexCount, - prevPos: vec2(), - position: pInitialPosition || vec2(), - prevVelocity: vec2(), - velocity: vec2(), - force: vec2(), - torque: 0, - mass: pMass === undefined ? 1 : pMass, - rotationVelocity: 0, - rotationRadians: 0, - model: translateMatrix(mat4(), pInitialPosition ? pInitialPosition.x : 0, pInitialPosition ? pInitialPosition.y : 0, 0), - radius: pRadius - }; -} - -function renderCircle(pGl, pProgramInfo, pCircle) { - pGl.uniformMatrix4fv(pProgramInfo.uniformLocations.model, false, pCircle.model); - pGl.bindBuffer(pGl.ARRAY_BUFFER, pCircle.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.TRIANGLE_STRIP, 0, pCircle.vertexCount); -} - -function getCircleMomentOfInertia(pCircle) { - return (Math.PI * Math.pow(pCircle.radius, 4)) / 4; -} - -function doCirclesIntersect(pFirst, pSecond) { - const lDistanceBetween = Math.pow(pFirst.position.x - pSecond.position.x, 2) - + Math.pow(pFirst.position.y - pSecond.position.y, 2) - return lDistanceBetween <= Math.pow(pFirst.radius + pSecond.radius, 2); -} - -/** - * Returns intersection information about the intersecting circles. - * - * Warning! Only use this if doCirclesIntersect returned true for these circles. - * - * @param {circle} pFirst - * @param {circle} pSecond - */ -function getIntersectionDataForCircles(pFirst, pSecond) { - // The collision normal is simply the difference between the two current positions - const lCollisionNormal = normalize2(subVec2(pFirst.position, pSecond.position)); - const lCollisionPoint = vec2( - ((pFirst.position.x * pSecond.radius) + (pSecond.position.x * pFirst.radius)) / (pFirst.radius + pSecond.radius), - ((pFirst.position.y * pSecond.radius) + (pSecond.position.y * pFirst.radius)) / (pFirst.radius + pSecond.radius) - ); - - return { - relativeVelocity: subVec2(pFirst.velocity, pSecond.velocity), - collisionNormal: lCollisionNormal, - //firstPointOfApplication: addVec2(scaleVec2(normalize2(pFirst.velocity), pFirst.radius), pFirst.position), - //secondPointOfApplication: addVec2(scaleVec2(normalize2(pSecond.velocity), pSecond.radius), pSecond.position) - firstPointOfApplication: subVec2(lCollisionPoint, pFirst.position), - secondPointOfApplication: subVec2(lCollisionPoint, pSecond.position) - } -} - -function freeCircle(pGl, pCircle) { - pGl.deleteBuffer(pCircle.buffer); -}
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