287 lines
9.6 KiB
HTML
287 lines
9.6 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<body>
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<canvas id = "sample" width = "600" height = "600"></canvas>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
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<script type="text/javascript">
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var tile = {"x":[96,64,160,64,48,192,16,80,112,16,64,176,80,64,32,176,16,144,176,176,112,128,224,16,16,176,16,0,64,160,128,160,208,80,192,0,80,16,192,128,208,160,128,192,32,112,144,112,80,32,80,112,32,80,112,80,32,144,112,144,32,80,32,176,112,208,32,96,192,144,160,144,208,144,0,112,224,160,16,0,208,128,48,0,176,96,96,48,48,64,96,48,96,48,96],"y":[176,192,208,160,176,208,224,32,48,64,144,224,208,128,96,240,112,208,160,192,208,208,240,192,240,144,80,160,208,160,176,192,240,128,240,240,144,48,192,224,192,240,16,160,176,16,224,224,240,224,192,176,16,160,240,224,160,240,160,192,80,176,240,208,192,224,112,208,224,128,176,144,176,112,224,144,208,224,176,208,208,96,64,32,176,112,144,144,112,176,192,160,160,240,240],"z":6,"coord":{"x":18,"y":24,"z":6},"timeCount":[95],"timeIndex":[0],"renderDataPos":[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94],"renderData":[3,4,3,3,3,4,2,1,1,1,1,5,2,3,1,11,2,5,2,6,2,4,4,5,1,1,1,1,1,1,2,1,8,7,15,1,8,1,1,4,3,6,1,1,1,2,2,1,5,2,4,1,1,2,2,1,1,5,2,4,1,1,2,2,2,5,2,6,8,1,2,1,1,2,1,1,1,2,3,1,4,1,2,1,3,1,4,1,1,2,1,2,2,4,2],"maxDate":0};
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var grid = gridData(tile);
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var canvas = document.getElementById("sample");
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var ctx = canvas.getContext("2d");
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for (var y = 0; y < grid.length; y++){
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for (var x = 0; x < grid[0].length; x++){
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ctx.beginPath();
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ctx.arc(20 + x*20, 20 + y*20, 3, 0, 2 * Math.PI, false);
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var value = grid[y][x];
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ctx.fillStyle = "rgb("+0+", "+value * 50+", "+value * 50+")";
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if(value === 0) ctx.fillStyle = "red";
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ctx.fill();
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}
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}
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var cellsX = grid[0].length-1;
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var cellsY = grid.length-1;
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var contourValues = [0];
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var lines = [];
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for(var c = 0; c < contourValues.length; c++){
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var pointsTraveled = new Set();
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var pointerX = 0, pointerY = 0, x = 0, y = 0;
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var line = [];
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var xy = march(0,0);
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while(xy){
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xy = march(xy.x, xy.y);
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}
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function march(x,y){
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if(x >= grid[0].length){
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pointerX = 0;
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pointerY++;
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return {x: pointerX, y: pointerY };
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}
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if (pointerX === 0 && y > grid.length-2) return;
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if (pointsTraveled.has(x+":"+y) && line.length === 0){
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pointerX ++;
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return {x: pointerX, y: pointerY };
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}
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else{
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pointsTraveled.add(x+":"+y);
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var NW = grid[y][x],
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NE = grid[y][x+1],
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SE = grid[y+1]? grid[y+1][x+1]: 0,
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SW = grid[y+1]? grid[y+1][x]: 0
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var cornerValues = [NW, NE, SE, SW];
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var currentPos = {x: x, y: y};
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var previousPos = line.length > 0? {x: line[line.length-1].coord.x, y: line[line.length-1].coord.y}: null;
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var next = getNext(currentPos, previousPos, cornerValues, contourValues[c]);
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if (next){
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if (line.length > 0 && (line[0].coord.x === x && line[0].coord.y === y)){
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lines.push(line);
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line = [];
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pointerX ++;
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return {x: pointerX, y: pointerY };
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}
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else{
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line.push({coord: {x: x, y: y, interpolation: next.interpolation}, values: cornerValues});
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return next;
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}
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}
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else {
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pointerX ++;
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return {x: pointerX, y: pointerY };
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}
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}
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}
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}
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ctx.strokeStyle = "black"
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for (var l = 0; l < lines.length; l++){
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var line = cardinalSpline(lines[l]);
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ctx.beginPath();
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ctx.moveTo(line[0][0], line[0][1]);
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for (var p = 2; p < line.length; p+=2){
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ctx.lineTo(line[p], line[p+1]);
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}
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ctx.closePath();
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ctx.stroke();
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}
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function cardinalSpline(line){
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var plainArray = [];
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for (var p = 0; p < line.length; p++){
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var interpolation = line[p].coord.interpolation || {x: 0.5, y: 0.5};
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plainArray.push(20 + 20*line[p].coord.x + 20 * interpolation.x);
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plainArray.push(20 + 20*line[p].coord.y + 20 * interpolation.y);
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}
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return cSpline(plainArray, 0.5, 25, true);
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}
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function gridData(tile){
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var res = 16;
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var grid = new Array(256/res);
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for(var i =0; i<grid.length; i ++){
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grid[i] = new Array(256/res);
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for(var j =0; j < grid[i].length; j++){
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grid[i][j] = 0;
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}
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}
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for(var i =0; i < tile.renderData.length; i++){
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var x = tile.x[i], y = tile.y[i];
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grid[y/res][x/res] = tile.renderData[i];
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}
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return grid;
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}
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function getNext(currentPos, previousPos, cornerValues, contourValue){
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var binaryCell = cornerValues.map(function(cornerValue){
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if (cornerValue > contourValue){
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return "1";
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}
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return "0";
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}).join("");
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var type = parseInt(binaryCell, 2);
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var N = [0, -1],
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S = [0, 1],
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E = [1, 0],
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W = [-1, 0];
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var next, interpolation;
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if (type === 0 || type === 15) return null;
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else if (type === 1 || type === 14){
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next = [S,W];
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interpolation = {
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x: lerp(cornerValues[2], cornerValues[3], contourValue),
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y: lerp(cornerValues[0], cornerValues[3], contourValue)
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};
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}
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else if (type === 2 || type === 13){
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next = [E,S];
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interpolation = {
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x: lerp(cornerValues[3], cornerValues[2], contourValue),
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y: lerp(cornerValues[1], cornerValues[2], contourValue)
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};
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}
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else if (type === 3 || type === 12) {
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next = [E,W];
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interpolation = {
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x: 0.5,
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y: 0.5
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};
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}
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else if (type === 4 || type === 11){
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next = [N,E];
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interpolation = {
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x: lerp(cornerValues[0], cornerValues[1], contourValue),
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y: lerp(cornerValues[2], cornerValues[1], contourValue)
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};
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}
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else if (type === 6 || type === 9) {
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next = [N,S];
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interpolation = {
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x: 0.5,
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y: 0.5
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};
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}
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else if (type === 7 || type === 8) {
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next = [N,W];
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interpolation = {
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x: lerp(cornerValues[1], cornerValues[0], contourValue),
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y: lerp(cornerValues[3], cornerValues[0], contourValue)
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};
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}
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else if (type === 5 || type === 10) {
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var diff = [previousPos.x - currentPos.x, previousPos.y - currentPos.y];
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if (diff[0] === -1){
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return {x: currentPos.x, y: currentPos.y - 1};
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} else if (diff[0] === 1){
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return {x: currentPos.x, y: currentPos.y + 1};
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} else if (diff[1] === -1){
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return {x: currentPos.x + 1, y: currentPos.y};
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} else if (diff[1] === 1){
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return {x: currentPos.x - 1, y: currentPos.y};
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}
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}
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if (!previousPos || (currentPos.x + next[0][0] === previousPos.x && currentPos.y + next[0][1] === previousPos.y)){
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return {x: currentPos.x + next[1][0], y: currentPos.y + next[1][1], interpolation};
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}
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else return {x: currentPos.x + next[0][0], y: currentPos.y + next[0][1], interpolation};
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}
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// Linear interpolation
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function lerp(valueA, valueB, contourValue){
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return Math.max(Math.min(1 + (-0.5) * (contourValue - valueA) / (valueB - valueA), 0.8), 0.2);
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}
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function cSpline(points, tension, numOfSeg, close) {
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tension = (typeof tension === 'number') ? tension : 0.5;
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numOfSeg = numOfSeg ? numOfSeg : 25;
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var pts; // for cloning point array
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var i = 1;
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var l = points.length;
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var rPos = 0;
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var rLen = (l - 2) * numOfSeg + 2 + (close ? 2 * numOfSeg : 0);
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var res = new Float32Array(rLen);
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var cache = new Float32Array((numOfSeg + 2) * 4);
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var cachePtr = 4;
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var st, st2, st3, st23, st32, parse;
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pts = points.slice(0);
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if (close) {
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pts.unshift(points[l - 1]); // insert end point as first point
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pts.unshift(points[l - 2]);
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pts.push(points[0], points[1]); // first point as last point
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} else {
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pts.unshift(points[1]); // copy 1. point and insert at beginning
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pts.unshift(points[0]);
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pts.push(points[l - 2], points[l - 1]); // duplicate end-points
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}
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// cache inner-loop calculations as they are based on t alone
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cache[0] = 1; // 1,0,0,0
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for (; i < numOfSeg; i++) {
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st = i / numOfSeg;
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st2 = st * st;
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st3 = st2 * st;
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st23 = st3 * 2;
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st32 = st2 * 3;
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cache[cachePtr++] = st23 - st32 + 1; // c1
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cache[cachePtr++] = st32 - st23; // c2
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cache[cachePtr++] = st3 - 2 * st2 + st; // c3
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cache[cachePtr++] = st3 - st2; // c4
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}
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cache[++cachePtr] = 1; // 0,1,0,0
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parse = function (pts, cache, l) {
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var i = 2;
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var t, pt1, pt2, pt3, pt4, t1x, t1y, t2x, t2y, c, c1, c2, c3, c4;
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for (i; i < l; i += 2) {
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pt1 = pts[i];
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pt2 = pts[i + 1];
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pt3 = pts[i + 2];
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pt4 = pts[i + 3];
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t1x = (pt3 - pts[i - 2]) * tension;
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t1y = (pt4 - pts[i - 1]) * tension;
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t2x = (pts[i + 4] - pt1) * tension;
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t2y = (pts[i + 5] - pt2) * tension;
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for (t = 0; t < numOfSeg; t++) {
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//t * 4;
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c = t << 2; //jshint ignore: line
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c1 = cache[c];
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c2 = cache[c + 1];
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c3 = cache[c + 2];
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c4 = cache[c + 3];
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res[rPos++] = c1 * pt1 + c2 * pt3 + c3 * t1x + c4 * t2x;
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res[rPos++] = c1 * pt2 + c2 * pt4 + c3 * t1y + c4 * t2y;
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}
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}
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};
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// calc. points
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parse(pts, cache, l);
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if (close) {
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//l = points.length;
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pts = [];
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pts.push(points[l - 4], points[l - 3], points[l - 2], points[l - 1]); // second last and last
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pts.push(points[0], points[1], points[2], points[3]); // first and second
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parse(pts, cache, 4);
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}
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// add last point
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l = close ? 0 : points.length - 2;
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res[rPos++] = points[l];
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res[rPos] = points[l + 1];
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return res;
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};
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</script>
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