Basic Badge Preview in Badgeyay

A Badge generator like Badgeyay must be able to generate, store and export the user data as and when needed. This blog post covers the addition of a preview section in the badge generator. It is discussed as to how the attributes on preview section are added.

Adding the functionality to badgeyay

Let us see how we implemented this functionality into the frontend of the project.

Step 1 : Adding the helper function

We need to add a helper function for determining the font of the preview items. We define a function “rel”, as in relative, which defines the relative font size according to the chosen one.

export function rel(params) {
var [font_size] = params;
var iFont = parseInt(font_size);
if (iFont <= 10) {
return (iFont * 2.7).toString();
}
return (iFont * 2.15).toString();
}

Step 2 : Adding the styling in the scss file

Now we add the required styling in the SCSS file to ensure that the preview appears at the exactly as we desire it to be.

.bgImg {
border-radius: 5px;
height: 600px;
}

.preview.content {
margin-left: 50px;
padding-top: 200px;
}

Step 3 : Now we need to add attributes to controller

Now we need to define the attributes that will control the text inside the preview and the preview controller.

firstName      : ,
lastName       : ,
organization   : ,
socialHandle   : ,
designation    : ,
prevImageData  : ,

Now we define when will the preview be changed. In our case it will be changed when a user types in something or a new image is selected.

mutateText(txtData) {
this.manualClicked();
let prevData = txtData.split(‘\n’)[0].split(‘,’);
this.set(‘firstName’, prevData[0].toString());
this.set(‘lastName’, prevData[1].toString());
this.set(‘designation’, prevData[2].toString());
this.set(‘organization’, prevData[3].toString());
this.set(‘socialHandle’, prevData[4].toString());
this.set(‘textData’, txtData);
},
.
.
mutateCustomImage() {
this.set(‘prevImageData’, imageData);
}

The state of variables inside the preview section changes whenever the user types in a new name or designation etc. The image gets populated once the image is added either using the custom image input or by selecting the default image.

Screenshot of changes

Resources

Continue Reading

Toggling preview section in Badgeyay

A Badge generator like Badgeyay must be able to generate, store and export the user data as and when needed. This blog post covers the addition of a preview section in the badge generator. It is discussed as to how the feature of toggling the preview section was implemented in the project

Adding the functionality to badgeyay

Let us see how we implemented this functionality into the frontend of the project.

Step 1 : Adding the toggle button to the frontend UI

We add the button to toggle the preview on and off the screen using the standard handlebars convention. We add a button with the action ‘togglePreview’ to toggle the preview section in frontend.

<div class=“right floated right aligned six wide column”>
<
div class=“ui”>
<
button {{action ‘togglePreview‘}} class=“ui basic orange button” data-tooltip=“Toggle Preview (WIP)” data-position=“right center”>{{prevButton}}</button>
</
div>
<
/div>

Step 2 : Adding the styling in the scss file

Now we add the required styling in the SCSS file to ensure that the preview button appears at the exact desired position only.

.ui{

.column{
color: black;

.create-badge {
position: relative;
padding-left: 6%;
padding-right: 6%;
top: –50px;
}
}
}

Step 3 : Now we need to define states

Now we need to define the states that will control the text inside the preview button and the preview controller.

previewToggled : false,
prevButton     : ‘<‘,

Now we add the method to control the toggle feature in the component.

togglePreview() {
this.set(‘previewToggled’, !this.previewToggled);
if (this.previewToggled) {
this.set(‘prevButton’, ‘>’);
}
else {
this.set(‘prevButton’, ‘<‘);
}
}

The ‘togglePreview’ function changes the state of the preview, either rendering it on screen or off the screen. This is how we control the preview section being displayed on the screen.

Screenshot of changes

Resources

Continue Reading

Badge Generation : Adding Progress Bar

A Badge generator like Badgeyay must be able to generate, store and export the user data as and when needed. This blog post covers the addition of ember-progress-bar in the badgeyay project. This progress bar shows real-time progress of the badge generation process.

Adding the functionality to badgeyay

Let us see how we implemented this functionality into the backend of the project.

Step 1 : Adding the package to package.json

Image link is the link to the user’s uploaded image on remote firebase server.

ember install ember-progress-bar

or

npm install ember-progress-bar –save

Step 2 : Adding the progressbar to the frontend

Once we have installed the progress bar, we need to display it onto the frontend of the project.

To do that we use the handlebars templating engine to render the progress bar.

{{#if showProgress}}
<
div class=“ui segment”>
<
div class=“ui centered aligned grid”>{{progressState}}</div>
<
div class=“ui divider”></div>
{{ember-progress-bar progress=progress options=(hash color=’orange’)}}
</
div>
{{/if}}

Step 3 : Now we need to define states

We need to define the states that the progress bar will take up in realtime. And to do so, we make changes to the create-badges controller

showProgress   : false,
progress       : 0,
progressState  : ,

Now we manage the states according to the functionality that has been done.

this.set(‘showProgress’, true);
this.set(‘progress’, 0.1);
this.set(‘progressState’, ‘Setting Paper Size’);

this.set(
‘progress’, 0.4);
this.set(‘progressState’, ‘Gathering background’);

this.set(
‘progress’, 0.7);
this.set(‘progressState’, ‘Preparing your badges’);

this.set(
‘showProgress’, false);
this.set(‘progress’, 0);
this.set(‘progressState’, );

Finally, we have our basic progress bar ready for the users to view.

Screenshot of changes

Resources

Continue Reading

Generating Real-Time Graphs in PSLab Android App

In PSLab Android App, we need to log data from the sensors and correspondingly generate real-time graphs. Real-time graphs mean a data streaming chart that automatically updates itself after every n second. This was different from what we did in Oscilloscope’s graph, here we need to determine the relative time at which the data is recorded from the sensor by the PSLab.

Another thing we need to take care of was the range of x axis. Since the data to be streamed is ever growing, setting a large range of the x axis will only make reading sensor data tedious for the user. For this, the solution was to make real time rolling window graph. It’s like when the graph exceeds the maximum range of x axis, the graph doesn’t show the initial plots. For example, if I set that graph should show the data only for the 10-second window when the 11th-second data would be plot, the 1st-second data won’t be shown by the graph and maintains the difference between the maximum and the minimum range of the graph. The graph library we are going to use is MPAndroidChart. Let’s break-down the implementation step by step.

First, we create a long variable, startTime which records the time at which the entire process starts. This would be the reference time. Flags make sure when to reset this time.

if (flag == 0) {
   startTime = System.currentTimeMillis();
   flag = 1;
}

 

We used Async Tasks approach in which the data is from the sensors is acquired in the background thread and the graph is updated in the UI thread. Here we consider an example of the HMC5883L sensor, which is actually Magnetometer. We are calculating time elapsed by subtracting current time with the sartTime and the result is taken as the x coordinate.

private class SensorDataFetch extends AsyncTask<Void, Void, Void> {
   ArrayList<Double> dataHMC5883L = new ArrayList<Double>();
   long timeElapsed;

   @Override
   protected Void doInBackground(Void... params) {
       
     timeElapsed = (System.currentTimeMillis() - startTime) / 1000;

     entriesbx.add(new Entry((float) timeElapsed, dataHMC5883L.get(0).floatValue()));
     entriesby.add(new Entry((float) timeElapsed, dataHMC5883L.get(1).floatValue()));
     entriesbz.add(new Entry((float) timeElapsed, dataHMC5883L.get(2).floatValue()));
       
     return null;
   }

 

As we need to create a rolling window graph we require to add few lines of code with the standard implementation of the graph using MPAndroidChart. This entire code is placed under onPostExecute method of AsyncTasks. The following code sets data set for the Line Chart and tells the Line Chart that a new data is acquired. It’s very important to call notifyDataSetChanged, without this the things won’t work.

mChart.setData(data);
mChart.notifyDataSetChanged();

 

Now, we will set the visible range of x axis. This means that the graph window of the graph won’t change until and unless the range set by this method is not achieved. Here we are setting it to be 10 as we need a 10-second window.

mChart.setVisibleXRangeMaximum(10);

Then we will call moveViewToX method to move the view to the latest entry of the graph. Here, we have passed data.getEntryCount method which returns the no. of data points in the data set.

mChart.moveViewToX(data.getEntryCount());

 

We will get following results

To see the entire code visit this link.

Resources

Continue Reading
Close Menu