arrays - Randomize heights Javascript -


i'm making little data-chart in javascript school. have make random button , have no idea how to? tried lot of thing nothing happening. idee? here code https://jsfiddle.net/gbfbvbj7

(function() { var canvas = document.getelementbyid('canvas'); var ctx = canvas.getcontext('2d'); var height = -20; var xposnew = -950; var turning = 0; var button; var dataname = ["space invaders","street fighter ii","donkey kong","pac-man","asteroids","defender","ms. pac-man","centipede","galaxian","starhorse2","donkey kong jr.","mr. do!","tempest","mortal kombat ii","beatmania","q*bert","mortal kombat","robotron: 2084","dig dug","pole position","popeye","out run","pump up","missile command","jungle hunt","dragon's lair","berzerk","scramble","battlezone","stargate","mushiking: king of beetles","mahjong fight club 3","sega network mahjong mj4","star wars","super cobra","space duel","pong","breakout","oshare majo: love , berry","sea wolf"]; var datasales = [360000,200000,132000,400000,100000,60000,125000,55988,40000,38614,30000,30000,29000,27000,25000,25000,24000,23000,22228,21000,20000,20000,20000,18000,16000,15780,15136,15122,15000,13500,13000,12892,12695,12337,12038,12000,11000,10300,10000,9000];     function init() {          button = document.queryselectorall('.randomize');         button[0].addeventlistener("click" , randomize);         window.requestanimationframe(draw);         text();     }     function randomize(){      }      function draw(){         height += 4;         turning += 0.005;         var maxbar = 0;         var xpos = 0;         var ypos = 555;         var geel = 0;         var blauw = 255;         var groen = 255;         var rotatie = 0;           (var = 0; < datasales.length; i++) {                          maxbar = math.max(maxbar, datasales[i] / 800);                         rotatie += 0.157;                         geel += 6;                         blauw += 6;                         groen -= 6;                         xpos += 23;                         ctx.save();                         ctx.beginpath();                         ctx.translate(480, 400);                         ctx.fillstyle= "rgb(" + geel + "," + groen + "," + blauw + ")";                         ctx.rotate(rotatie);                         ctx.rect(0,-155,15,-math.min(height, datasales[i] / 1800));                         ctx.fill();                         ctx.restore();                   }              window.requestanimationframe(draw);       }        function text(){             var rotatie2 = -1.48;             var geel = 0;             var blauw = 255;             var groen = 255;         (var = 0; < dataname.length; i++) {             rotatie2 += 0.157;             xposnew += 23;             geel += 6;             blauw += 6;             groen -= 6;                         ctx.save();                         ctx.translate( canvas.width - 1, 0);                         ctx.rotate(3 * math.pi / 2);                         ctx.font = "11px arial";                         ctx.fillstyle= "rgb(" + geel + "," + groen + "," + blauw + ")";                         ctx.textalign = "left";                         ctx.filltext( dataname[i], -780, xposnew);                         ctx.restore();         }            (var = 0; < datasales.length; i++) {                           rotatie2 += 0.1575;                         ctx.save();                         ctx.beginpath();                         ctx.translate(480, 400);                         ctx.rotate(rotatie2);                         ctx.fill();                         ctx.fillstyle = "#fff";                         ctx.font = "11px arial";                         ctx.textalign = "left";                         ctx.filltext( datasales[i], 95,0);                         ctx.restore();         }     }   init();  })();

use math.random():

function randomize() {     // put new random values datasales (0-499,999)     datasales = datasales.map(function() {       return math.floor(math.random() * 500000);     });     // clear canvas     ctx.clearrect(0, 0, canvas.width, canvas.height);     // redraw     draw(); }

btw no reason use window.requestanimationframe(draw); when not playing around animations, call draw once , again when need redraw.


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