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ecmascript: var x; var y; var Vx; var Vy; var B_m; var dt; var blocksize; var Vi; var theta; var key; var keyValue; var previousFraction; var previousFractionIndex; var blockSize; var outputArray; function tracePrint (outputString) { var traceEnabled = true; if (traceEnabled) Browser.println ('[WaypointInterpolator]' + outputString); } function alwaysPrint (outputString) { Browser.println ('[WaypointInterpolator]' + outputString); } function initialize() { key = new Array(); keyValue = new MFVec3f(); x = new Array(); y = new Array(); calculateTrajectory(); previousFractionIndex = -1; previousFraction = 0; // check key array ranges [0..1] and is monotonically increasing // check that size of keyValue array is integer multiple of size of key array tracePrint ('key =' + key); tracePrint ('key.length= ' + key.length); tracePrint ('keyValue= ' + keyValue); tracePrint ('keyValue.length=' + keyValue.length); blockSize = 3; //keyValue.length/key.length; tracePrint ('blockSize=' + blockSize); if (blockSize != Math.round(blockSize)) { alwaysPrint ('*** warning: blockSize not an integer multiple. check sizes of key and keyValue'); } if (key[0] != 0) { alwaysPrint ('*** warning: key[0] != 0'); } if (key[key.length-1] != 1) { alwaysPrint ('*** warning: key[' + (key.length - 1) + '] != 1, reset from' + key[key.length-1] + ' to 1'); key[key.length-1] = 1; } for (index = 0; index < blockSize; index++) { if ((key[index] < 0) || (key[index] > 1)) { alwaysPrint ('*** warning: key[' + index + '] =' + key[index] + ', out of range [0..1]'); } } // instantiate default array, later computations just update it outputArray = new SFVec3f(); outputArray = keyValue[0]; tracePrint ('initial outputArray=' + outputArray); } function set_fraction (inputFloat, timestamp) { fraction = inputFloat; tracePrint ('previousFractionIndex=' + previousFractionIndex + ', fraction=' + fraction + ', previousFraction=' + previousFraction); if (fraction < 0) { tracePrint ('*** illegal fraction' + fraction + ' set to 0'); fraction = 0; previousFractionIndex = 0; // first } else if (fraction > 1) { alwaysPrint ('*** illegal fraction' + fraction + ' set to 1'); fraction = 1; previousFractionIndex = blockSize - 1; // last } else if (previousFractionIndex == -1) { previousFractionIndex = 0; // first tracePrint ('previousFractionIndex initialized for first event'); } else if ((fraction >= previousFraction) && (fraction >= key[previousFractionIndex+1])) { previousFractionIndex++; } else if (fraction < previousFraction) // regress, or loop repeat without reaching one { previousFractionIndex = 0; while ((fraction >= key[previousFractionIndex+1]) && (previousFractionIndex < blockSize)) { previousFractionIndex++; } tracePrint ('reset/reincrement previousFractionIndex to' + previousFractionIndex); } if (fraction == 1) // use final block { tracePrint ('(fraction == 1)'); outputArray = keyValue[(keyValue.length -1)]; previousFractionIndex = -1; // setup for restart tracePrint ('finished final fraction==1 block'); } // when fraction matches index, calculate value_changed from corresponding keyValue array else if (fraction == key[previousFractionIndex]) { tracePrint ('(fraction == key[previousFractionIndex])'); // update outputArray - need to interpolate next outputArray = keyValue[previousFractionIndex]; } else { delta = key[previousFractionIndex + 1] - key[previousFractionIndex]; differ = fraction - key[previousFractionIndex]; percentDiffer = differ / delta; valueDelta = new SFVec3f(); for(index = 0; index < blockSize; index++) { valueDelta[index] = keyValue[(previousFractionIndex + 1)][index] - keyValue[previousFractionIndex][index]; outputArray[index] = keyValue[previousFractionIndex][index] + valueDelta[index] * percentDiffer; Browser.println ('valueDelta' + valueDelta[index]); Browser.println ('perDiffer' + percentDiffer); } } value_changed = outputArray; previousFraction = fraction; tracePrint ('value_changed=' + value_changed); } function set_Vi(initialVelocity, timeStamp) { Vi = initialVelocity; initialize(timeStamp); } function set_theta(angle, timeStamp) { theta = angle; initialize(timeStamp); } function calculateTrajectory() { x[0] = 0; y[0] = 0; var timeKeys = new Array(); timeKeys[0] = 0.0; //convert degree to radian angle = Math.PI * theta / 180; Vx = Vi * Math.cos(angle); Vy = Vi * Math.sin(angle); var i = 0; do { i = i + 1; timeKeys[i] = timeKeys[i - 1] + dt; Browser.println ('timeKeys' + timeKeys[i]); x[i] = x[i - 1] + Vx * dt; y[i] = y[i - 1] + Vy * dt; f = B_m * Math.sqrt(Vx * Vx + Vy * Vy) * Math.exp(-y[i] / 0.0001); Vy = Vy - 9.8 * dt - f * Vy * dt; Vx = Vx - f * Vx * dt; Browser.println ('Vy' + Vy); }while(y[i] > 0); Browser.println ('Im here' + x.length); //interpolate to find landing point var a = -y[i] / y[i-1]; x[i] = (x[i] + a * x[i-1]) / (1+a); y[i] = 0; //copy x, y values to keyValues copyToKeyValues(); //finding keys for(j = 0; j < timeKeys.length; j++) { key[j] = timeKeys[j] / timeKeys[timeKeys.length - 1]; Browser.println (' ' + key[j]); } } function copyToKeyValues() { for(i = 0; i < x.length; i++) { Browser.println ('x' + x[i]); keyValue[i][0] = x[i]; keyValue[i][1] = y[i]; keyValue[i][2] = 0; Browser.println ('keyValue' + i + ' ' + keyValue[i][0]); } }
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Event Graph ROUTE Table with 0 ROUTE total, showing X3D event-model relationships for this scene.
Each row shows an event cascade that may occur during a single timestamp interval between frame renderings, as part of the X3D execution model.
ProjectileMotionTrackerScript
Script |
No ROUTE connection found for output from this node. |
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