An experiment to see if I can get svg paths to animate only to a certain horizontal line while a user scrolls. Used in my unreleased wongfu side project.
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April 18, 2019 03:35
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Animate SVG path on scroll
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| <html> | |
| <head> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.js" charset="utf-8"></script> | |
| <style> | |
| * { | |
| font-family: Helvetica, Verdana, sans-serif; | |
| } | |
| .marker { | |
| position: fixed; | |
| top: 0; | |
| left: 0; | |
| width: 100%; | |
| height: 400px; | |
| border: 1px solid #ccc; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <svg width="1000" height="20000"></svg> | |
| <div class="marker"></div> | |
| <script> | |
| var data = {categoryX: 300, points: [{"x":300,"y":161.16},{"x":300,"y":232.58},{"x":200,"y":359.51},{"x":300,"y":360.53},{"x":300,"y":566.63},{"x":300,"y":594.08},{"x":300,"y":650.37},{"x":300,"y":723.46},{"x":300,"y":864.01},{"x":300,"y":879.88},{"x":300,"y":1138.35},{"x":300,"y":1158.8},{"x":300,"y":1220.25},{"x":300,"y":1489.94},{"x":300,"y":1583.51},{"x":300,"y":1627.55},{"x":300,"y":1739.97},{"x":300,"y":1800.63},{"x":300,"y":1885.21},{"x":300,"y":1979.47},{"x":300,"y":2057.81},{"x":150,"y":2059.57},{"x":300,"y":2097.48},{"x":300,"y":2152.41},{"x":300,"y":2152.46},{"x":300,"y":2157.54},{"x":300,"y":2157.56},{"x":300,"y":2174.22},{"x":300,"y":2188.61},{"x":300,"y":2213.54},{"x":300,"y":2231.43},{"x":300,"y":2252},{"x":200,"y":2275.33},{"x":300,"y":2291.35},{"x":300,"y":2319.71},{"x":300,"y":2328.22},{"x":300,"y":2345.74},{"x":250,"y":2345.91},{"x":300,"y":2367.61},{"x":300,"y":2409.25},{"x":300,"y":2429.13},{"x":300,"y":2447.6},{"x":300,"y":2467.67},{"x":300,"y":2473.07},{"x":200,"y":2473.24},{"x":300,"y":2485.47},{"x":300,"y":2528.83},{"x":300,"y":2664.08},{"x":300,"y":2664.16},{"x":250,"y":2665.75},{"x":300,"y":2681.58},{"x":250,"y":2682.98},{"x":250,"y":2683.03},{"x":300,"y":2703.05},{"x":250,"y":2707.75},{"x":300,"y":2719.75},{"x":300,"y":2725.5},{"x":250,"y":2727.59},{"x":300,"y":2741.92},{"x":250,"y":2758.02},{"x":300,"y":2758.88},{"x":300,"y":2766},{"x":250,"y":2768.52},{"x":300,"y":2781.85},{"x":250,"y":2783.5},{"x":300,"y":2790.62},{"x":300,"y":2797.6},{"x":300,"y":2803.05},{"x":300,"y":2822.51},{"x":300,"y":2842.45},{"x":300,"y":2859.41},{"x":250,"y":2861.83},{"x":250,"y":2861.9},{"x":300,"y":2878.11},{"x":300,"y":2899.3},{"x":300,"y":2899.39},{"x":150,"y":2900.16},{"x":300,"y":2915.11},{"x":300,"y":2954.28},{"x":300,"y":2963.22},{"x":300,"y":2993.16},{"x":300,"y":3024.93},{"x":300,"y":3034.73},{"x":300,"y":3053.71},{"x":100,"y":3108.65},{"x":300,"y":3108.78},{"x":100,"y":3170.02},{"x":300,"y":3307.02},{"x":300,"y":3347},{"x":100,"y":3386.84},{"x":300,"y":3388.35},{"x":300,"y":3392.8},{"x":300,"y":3409.08},{"x":200,"y":3482.29},{"x":300,"y":3490.06},{"x":100,"y":3490.08},{"x":300,"y":3521.3},{"x":300,"y":3525.8},{"x":300,"y":3527.47},{"x":100,"y":3527.71},{"x":350,"y":3785.85},{"x":300,"y":3817.04},{"x":100,"y":3879.62},{"x":300,"y":3990.06},{"x":100,"y":3994.39},{"x":300,"y":4033.28},{"x":150,"y":4040},{"x":300,"y":4168.39},{"x":300,"y":4203.66},{"x":300,"y":4309.47},{"x":300,"y":4355.49},{"x":300,"y":4438.63},{"x":300,"y":4501.4},{"x":300,"y":4527.18},{"x":300,"y":4527.24},{"x":300,"y":4527.32},{"x":300,"y":4705.31},{"x":200,"y":4790.07},{"x":300,"y":4790.17},{"x":300,"y":4831.58},{"x":300,"y":4909.79},{"x":300,"y":4978.06},{"x":300,"y":5024.68},{"x":300,"y":5341.95},{"x":300,"y":5404.04},{"x":300,"y":5707.09},{"x":300,"y":5846.84},{"x":300,"y":5918.93},{"x":300,"y":5956.66},{"x":300,"y":6008.86},{"x":300,"y":6032.41},{"x":300,"y":6074.86},{"x":300,"y":6160.47},{"x":300,"y":6494.77},{"x":300,"y":6544.9},{"x":300,"y":6554.59},{"x":300,"y":6572.89},{"x":300,"y":6620.47},{"x":300,"y":6628.18},{"x":300,"y":6651.49},{"x":300,"y":6690.64},{"x":300,"y":6734.86},{"x":300,"y":6784.42},{"x":300,"y":6897.47},{"x":50,"y":6978.9},{"x":300,"y":7053.46},{"x":300,"y":7064.33},{"x":300,"y":7081.25},{"x":200,"y":7169.69},{"x":300,"y":7169.81},{"x":300,"y":7209.83},{"x":300,"y":7258.2},{"x":100,"y":7352.41},{"x":300,"y":7365.26},{"x":300,"y":7437.33},{"x":300,"y":7556.63},{"x":300,"y":7589.71},{"x":300,"y":7626.93},{"x":300,"y":7649.84},{"x":300,"y":7666.02},{"x":300,"y":7689.28},{"x":300,"y":7705.31},{"x":300,"y":7727.3},{"x":300,"y":7744.38},{"x":300,"y":7766.83},{"x":300,"y":7817.81},{"x":300,"y":7862.84},{"x":400,"y":7882.63},{"x":300,"y":8036.55},{"x":300,"y":8192.58},{"x":300,"y":8419.56},{"x":300,"y":8566.87},{"x":300,"y":8667.14},{"x":300,"y":8780.15},{"x":300,"y":8784.1},{"x":300,"y":8827.76},{"x":300,"y":8855.53},{"x":300,"y":8890.78},{"x":300,"y":8939.6},{"x":300,"y":8997.51},{"x":300,"y":9169.01},{"x":300,"y":9314.37},{"x":300,"y":9399.17},{"x":300,"y":9594.91},{"x":500,"y":9756.56},{"x":200,"y":10109.02}]}; | |
| var svg = d3.select('svg'); | |
| var distancePath = svg.append('path') | |
| .attr('fill', 'none') | |
| .attr('stroke', 'none').node(); | |
| var source; | |
| var target; | |
| var gap = 100; | |
| var totalDistance = 0; | |
| _.each(data.points, function(target) { | |
| if (!source) { | |
| target.d = 'M' + target.x + ',' + target.y; | |
| } else { | |
| if (source.y > target.y - gap) { | |
| // if they're sufficiently close to each other | |
| if (source.x === target.x) { | |
| target.d = drawLine(target.x, target.y); | |
| setDistance(source, target); | |
| } else { | |
| target.d = drawCurve(source.x, source.y, target.x, target.y); | |
| setDistance(source, target); | |
| target.y1 = target.y - source.y; | |
| target.interpolate1 = d3.interpolate(0, target.distance); | |
| } | |
| } else { | |
| target.d = ''; | |
| if (source.x !== data.categoryX) { | |
| // if the source repo owner isn't the same as the contributor, move the line back | |
| target.d += drawCurve(source.x, source.y, data.categoryX, source.y + gap / 3); | |
| setDistance(source, target); | |
| target.y1 = gap / 3; | |
| target.interpolate1 = d3.interpolate(0, target.distance); | |
| } | |
| x = target.x; | |
| y = target.y; | |
| if (target.x !== data.categoryX) { | |
| x = data.categoryX; | |
| y = target.y - gap / 3; | |
| } | |
| target.d += drawLine(x, y); | |
| target.y2 = y - (target.y1 || 0); | |
| setDistance(source, target); | |
| if (target.x !== data.categoryX) { | |
| target.d += drawCurve(x, y, target.x, target.y); | |
| var currentDistance = target.distance; | |
| setDistance(source, target); | |
| target.y3 = gap / 3; | |
| target.interpolate2 = d3.interpolate(0, target.distance - currentDistance); | |
| } | |
| } | |
| target.totalDistance = (totalDistance += target.distance); | |
| } | |
| source = target; | |
| }); | |
| var path = svg.append('path') | |
| .attr('d', _.pluck(data.points, 'd').join(' ')) | |
| .attr('fill-opacity', 0) | |
| .attr('stroke', '#3FB8AF') | |
| .attr('stroke-width', 4) | |
| .attr('stroke-linecap', 'round') | |
| .attr('stroke-dasharray', totalDistance) | |
| .attr('stroke-dashoffset', totalDistance); | |
| var circle = svg.selectAll('circle') | |
| .data(data.points).enter().append('circle') | |
| .attr('fill', '#fff') | |
| .attr('stroke', '#3FB8AF') | |
| .attr('stroke-width', 2) | |
| .attr('cx', function(d) {return d.x}) | |
| .attr('cy', function(d) {return d.y}) | |
| .attr('r', 4); | |
| window.addEventListener('scroll', _.throttle(windowScroll, 200)); | |
| function windowScroll() { | |
| var top = scrollY + 400; | |
| var source; | |
| var target = _.find(data.points, function(point) { | |
| if (point.y >= top) { | |
| return true; | |
| } | |
| source = point; | |
| return false; | |
| }); | |
| if (source && target) { | |
| var distance = 0; | |
| var distanceFromSource = top - source.y; | |
| if (!target.interpolate1) { | |
| // if there's no interpolate1 | |
| if (!target.interpolate2) { | |
| // and there's no interpolate2, must mean it's a straight line | |
| distance = distanceFromSource + source.totalDistance; | |
| } else { | |
| // if there's a interpolate2, must mean there's a straight line | |
| // and then a curve at the end, so figure out if we're in straight line or curve part | |
| if (distanceFromSource <= target.y2) { | |
| // it's in straight line part | |
| distance = distanceFromSource + source.totalDistance; | |
| } else { | |
| // if it's in last curve part, first interpolate the curve | |
| // and then add that back to the straight part and the previous total distance | |
| var partialDistance = (distanceFromSource - target.y2) / target.y3; | |
| distance = target.interpolate2(partialDistance) + target.y2 + source.totalDistance; | |
| } | |
| } | |
| } else { | |
| // if there's interpolate1, must mean there's a first curve | |
| if (distanceFromSource <= target.y1) { | |
| // so if it's within the first curve, interpolate that and add it to total distance | |
| var partialDistance = distanceFromSource / target.y1; | |
| distance = target.interpolate1(partialDistance) + source.totalDistance; | |
| } else if (distanceFromSource <= (target.y1 + target.y2)) { | |
| // if we're in line part, add curve to it | |
| distance = target.interpolate1(1) + (distanceFromSource - target.y1) + source.totalDistance; | |
| } else if (interpolate2) { | |
| var partialDistance = (distanceFromSource - target.y2 - target.y1) / target.y3; | |
| distance = target.interpolate1(1) + target.y2 + target.interpolate2(partialDistance); | |
| } | |
| } | |
| // var partialDistance = (top - source.y) / (target.y - source.y); | |
| // var distance = target.interpolater(partialDistance) + source.totalDistance; | |
| path.transition().duration(200) | |
| .attr('stroke-dashoffset', totalDistance - (distance || 0)); | |
| } | |
| }; | |
| function drawLine(x, y) { | |
| return 'L' + x + ',' + y; | |
| } | |
| function drawCurve(x1, y1, x2, y2) { | |
| var cy = (y1 + y2) / 2; | |
| return 'C' + x1 + ',' + cy + ' ' + x2 + ',' + cy + ' ' + x2 + ',' + y2; | |
| } | |
| function setDistance(source, target) { | |
| var distancePathD = 'M' + source.x + ',' + source.y + ' ' + target.d; | |
| distancePath.setAttribute('d', distancePathD); | |
| target.distance = parseFloat(distancePath.getTotalLength().toFixed(2)); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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