Created
October 23, 2015 23:02
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Happy Trails
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Happy Trails</title> | |
| <link rel="stylesheet" href="style.css"> | |
| </head> | |
| <body> | |
| <div id="calculator"></div> | |
| <script src="//www.desmos.com/api/v0.5/calculator.js?apiKey=dcb31709b452b1cf9dc26972add0fda6"></script> | |
| <script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| var elt = document.getElementById('calculator'); | |
| var opts = { | |
| expressionsCollapsed: true, | |
| lockViewport: true | |
| }; | |
| var exp = [ | |
| { | |
| id: 'a', | |
| latex: 'a = 0' | |
| }, | |
| { | |
| id: 'b', | |
| latex: 'b = 0' | |
| }, | |
| { | |
| id: 'point', | |
| latex: '(a, b)', | |
| color: Desmos.Colors.RED | |
| } | |
| ]; | |
| var calc = Desmos.Calculator(elt, opts); | |
| calc.setExpressions(exp); | |
| var svg = d3.select('body').append('svg') | |
| .style({position: 'absolute', 'pointer-events': 'none'}); | |
| var coords = calc.graphpaperBounds.pixelCoordinates; | |
| svg.attr('width', coords.width) | |
| .attr('height', coords.height) | |
| .style({top: coords.top, left: coords.left}); | |
| var aHelper = calc.HelperExpression({latex: 'a'}); | |
| aHelper.observe('numericValue', function() { | |
| requestAnimationFrame(omgCircles); | |
| }); | |
| var bHelper = calc.HelperExpression({latex: 'b'}); | |
| function omgCircles() { | |
| var px = calc.mathToPixels({x: aHelper.numericValue, y: bHelper.numericValue}); | |
| svg.insert("circle") | |
| .attr("cx", px.x) | |
| .attr("cy", px.y) | |
| .attr("r", 10) | |
| .style("fill", Desmos.Colors.next()) | |
| .style("fill-opacity", 1) | |
| .transition() | |
| .duration(1000) | |
| .ease(Math.sqrt) | |
| .attr("r", 40) | |
| .style("fill-opacity", 1e-6) | |
| .remove(); | |
| } | |
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| html, | |
| body { | |
| margin: 0; | |
| } | |
| html, | |
| body, | |
| #calculator { | |
| width: 100%; | |
| height: 100%; | |
| } |
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