Created
October 15, 2018 21:22
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Random walk
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Random walk</title> | |
| <!-- <script type="text/javascript" src="../d3.js"></script> --> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| </head> | |
| <body> | |
| <button id="pause">Pause/Resume</button> | |
| <button id="clear">Clear</button> | |
| <script type="text/javascript"> | |
| // Your beautiful D3 code will go here | |
| var w = 1000; | |
| var h = 1000; | |
| var padding = 50; | |
| var max = 50; | |
| var startLine = [200, 200, 400, 300]; | |
| var pause = false; | |
| var getRandomNumber = function(x){ | |
| var multiplier; | |
| var y = Math.random(); | |
| if(y > .5){ | |
| multiplier = 1 | |
| } else{ | |
| multiplier = -1 | |
| } | |
| var rand = Math.random(); | |
| var returnValue = Math.floor(rand * x) * multiplier; | |
| return returnValue; | |
| }; | |
| var getNextPoints = function(){ | |
| var newLine = []; | |
| newLine.push(startLine[2]); | |
| newLine.push(startLine[3]); | |
| var x2_new = startLine[2]; | |
| var x2_step = getRandomNumber(max); | |
| if((x2_new + x2_step) > (w - padding)){ | |
| x2_new -= x2step; | |
| } else if ((x2_new + x2_step) < padding){ | |
| x2_new += (x2_step * -1); | |
| } else { | |
| x2_new += x2_step; | |
| } | |
| newLine.push(x2_new); | |
| var y2_new = startLine[3]; | |
| var y2_step = getRandomNumber(max); | |
| if((y2_new + y2_step) > (h - padding)){ | |
| y2_new -= y2step; | |
| } else if ((y2_new + y2_step) < padding){ | |
| y2_new += (y2_step * -1); | |
| } else { | |
| y2_new += y2_step; | |
| } | |
| y2_new += y2_step; | |
| newLine.push(y2_new); | |
| startLine = newLine; | |
| }; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr('width', w) | |
| .attr('height', h); | |
| var check = function(){ | |
| console.log(pause); | |
| return pause; | |
| } | |
| var createLine = function(){ | |
| var suspend = check(); | |
| if(suspend == false){ | |
| getNextPoints(); | |
| svg.append('line') | |
| .attr('class', 'line') | |
| .attr('x1', startLine[0]) | |
| .attr('y1', startLine[1]) | |
| .attr('x2', startLine[2]) | |
| .attr('y2',startLine[3]) | |
| .attr('stroke', 'black'); | |
| } | |
| }; | |
| var walker; | |
| var startInterval = function(){ | |
| if(pause == false){ | |
| walker = setInterval(createLine, 100); | |
| } else{ | |
| } | |
| }; | |
| startInterval(); | |
| d3.select('#pause') | |
| .on('click', function(d) { | |
| if(pause == false){ | |
| clearInterval(walker); | |
| pause = true; | |
| } else { | |
| pause = false; | |
| startInterval(); | |
| } | |
| }); | |
| d3.select('#clear') | |
| .on('click', function(d) { | |
| clearInterval(walker); | |
| pause = false; | |
| d3.selectAll(".line") | |
| .remove(); | |
| startInterval(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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