Creating and Updating Graph in HTML and Javascript -


i have website calls function randomly picks number 2 decimal places e.g.

(5.53)

here code:

randomnum = math.floor(math.random() * (1000 - 100) + 100) / 100;

(this gives me value between 1 , 10 2 decimal places)

the website counts number in increments of 0.01 , when reaches value stops , loops creating random number , starts counting again.

if (randomnum < c) {     c = 0;     stopcount() }

(c counter value increments 0.01 every 20ms)

i'm trying create line graph shows increments , updates, image visual aid only, not have working version. this basic version cannot update

this code below i'm using general shape, did not create code. here link source im using. http://www.chartjs.org/docs/latest/charts/line.html

function renderchart() { var ctx = document.getelementbyid("bettingarea").getcontext('2d'); var mylinechart = new chart(ctx, { type: 'line', data: {     labels: [ "1", "2", "3", "4",],     datasets: [{         label: 'crash graph',         data: [5.44, 5.67, 5.94, 6.12,],         backgroundcolor: [             'rgba(255, 99, 132, 0.2)',             'rgba(54, 162, 235, 0.2)',             'rgba(255, 206, 86, 0.2)',             'rgba(75, 192, 192, 0.2)',             'rgba(153, 102, 255, 0.2)',             'rgba(255, 159, 64, 0.2)'         ],         bordercolor: [             'rgba(255,99,132,1)',             'rgba(54, 162, 235, 1)',             'rgba(255, 206, 86, 1)',             'rgba(75, 192, 192, 1)',             'rgba(153, 102, 255, 1)',             'rgba(255, 159, 64, 1)'         ],         borderwidth: 1     }] }, options: {     scales: {         yaxes: [{             ticks: {                 beginatzero:false             }         }]     } } }); }

the same website has http://www.chartjs.org/docs/latest/developers/updates.html

which cannot seam working no matter :(

i suppose i'm asking if there easier way of doing this, , if not please can updatedata set function working

thank provided :)

update: custom pseudocode (i imagine working so)

generate random = randomnum start timer update canvasgraph x.seconds , y.timer timer = timer + 0.01  if timer > randomnum stop.timer end loop else  continue timer start loop again

this basic form of code, , acts visual aid people trying visualize code, know i'm not using correct pseudocode terminology

if understand correctly, after :

var mylinechart, c = 0, label = 0, randomnum, interval;    function renderchart() {     var ctx = document.getelementbyid("bettingarea").getcontext('2d');     mylinechart = new chart(ctx, {        type: 'line',        data: {           labels: ["1", "2", "3", "4"],           datasets: [{              label: 'crash graph',              data: [5.44, 5.67, 5.94, 6.12],              backgroundcolor: [                 'rgba(255, 99, 132, 0.2)',                 'rgba(54, 162, 235, 0.2)',                 'rgba(255, 206, 86, 0.2)',                 'rgba(75, 192, 192, 0.2)',                 'rgba(153, 102, 255, 0.2)',                 'rgba(255, 159, 64, 0.2)'              ],              bordercolor: [                 'rgba(255,99,132,1)',                 'rgba(54, 162, 235, 1)',                 'rgba(255, 206, 86, 1)',                 'rgba(75, 192, 192, 1)',                 'rgba(153, 102, 255, 1)',                 'rgba(255, 159, 64, 1)'              ],              borderwidth: 1           }]        },        options: {           scales: {              yaxes: [{                 ticks: {                    beginatzero: false                 }              }]           }        }     });  }    function updatechart(chart) {     randomnum = math.floor(math.random() * (1000 - 100) + 100) / 100;     chart.data.labels = [];     chart.data.datasets[0].data = [];     interval = setinterval(function() {        if (c < randomnum) {           c += 0.01;           label++;           //update chart           chart.data.labels.push(label.tostring());           chart.data.datasets[0].data.push(+c.tofixed(2));           chart.update();        } else {           clearinterval(interval);           c = 0;           label = 0;           //updatechart(mylinechart) /* maybe call function again */        }     }, 20);  }    window.onload = renderchart;
<script src="https://cdnjs.cloudflare.com/ajax/libs/chart.js/2.6.0/chart.min.js"></script>  <canvas id="bettingarea"></canvas><br>  <button onclick="updatechart(mylinechart)">update chart</button>

correct me if wrong :)


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more