Multi-user gravity beats for Sound of Science 2013 (website)
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function createSVG(element){
return document.createElementNS('http://www.w3.org/2000/svg', element);
}
function addLine(line, svg_parent){
var svgline = createSVG('line');
svgline.setAttribute('x1', line.starting_point.x);
svgline.setAttribute('y1', line.starting_point.y);
svgline.setAttribute('x2', line.end_point.x);
svgline.setAttribute('y2', line.end_point.y);
svg_parent.appendChild(svgline);
return svgline;
}
function updateLine(svgline, abstractline){
svgline.setAttribute('x1', abstractline.starting_point.x);
svgline.setAttribute('y1', abstractline.starting_point.y);
svgline.setAttribute('x2', abstractline.end_point.x);
svgline.setAttribute('y2', abstractline.end_point.y);
return svgline;
}