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Add link to save diagram as a PNG (#4) #13

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Add link to save diagram as a PNG (#4) #13

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f199d59
Add link to save diagram as a PNG (#4)
techtonik Jun 29, 2020
25070e7
Add JS to save PNG (#4)
techtonik Jun 29, 2020
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5 changes: 4 additions & 1 deletion app/static/_templates/template.html
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,10 @@ <h3>Source:</h3>
<h3>Diagram:</h3>
<div id="diagram_image"></div>
{% if name != "graphviz" -%}
<p>Download your diagram: <span id="download_url"><a href="#">SVG (Save link as..)</a><span class="alert-danger" style="display: none;">(diagram to long)</span></span></p>
<p>Download your diagram:
<span id="download_url"><a href="#">SVG</a>, <a id="png_link" href="#">PNG</a> (Save link as..)
<span class="alert-danger" style="display: none;">(diagram to long)</span></span>
</p>
{%- endif %}
</div>
</div>
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30 changes: 29 additions & 1 deletion app/static/js/interactive.js
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,30 @@ function encode_diagram(diagram) {
return diagram;
}

class SVGtoPNGDataURL {
constructor() {
this.can = document.createElement('canvas'); // Not shown on page
this.ctx = this.can.getContext('2d');
this.loader = new Image; // Not shown on page
}

// Generate PNG data URL from SVG and send it to callback function when ready
go(mySVG, callback) {
var svgAsXML = (new XMLSerializer).serializeToString( mySVG );

this.loader.width = this.can.width = mySVG.clientWidth;
this.loader.height = this.can.height = mySVG.clientHeight;
var self = this;
this.loader.onload = function() {
self.ctx.drawImage( self.loader, 0, 0, self.loader.width, self.loader.height );
callback(self.can.toDataURL());
};
this.loader.src = 'data:image/svg+xml,' + encodeURIComponent( svgAsXML );
}
};

var pngconverter = new SVGtoPNGDataURL();

function update_diagram() {
diagram = $('#diagram').val();
if (diagram == null || diagram.length == 0) return;
Expand Down Expand Up @@ -90,8 +114,11 @@ function update_diagram() {
$('#download_url a').removeClass('disabled');
$('#shorten_url span').hide();
$('#download_url span').hide();
pngconverter.go($('#diagram_image svg'), callback=function(dataURL) {
$('#download_url a#png_link').attr('href', dataURL);
});
}

url = './image';
params = {'encoding': 'jsonp', 'src': diagram};
$.ajax({
Expand Down Expand Up @@ -138,6 +165,7 @@ function update_diagram() {
});
}


/* parse arguments */
var args = [], arg;
var parsed = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
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