Scroll down to lift top layer; scroll up to stack layers.
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May 9, 2017 13:48
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .plot { | |
| perspective: 700px; | |
| perspective-origin: 10% 10%; | |
| } | |
| .grid { | |
| height: 342px; | |
| width: 342px; | |
| border: 2px solid #808080; | |
| position: absolute; | |
| transform: rotateX(65deg); | |
| } | |
| .cell { | |
| height: 15px; | |
| width: 15px; | |
| border: 2px solid white; | |
| position: absolute; | |
| } | |
| #scroll_overlay { | |
| height: 500px; | |
| width: 500px; | |
| position: absolute; | |
| } | |
| </style> | |
| <body> | |
| <!--viz--> | |
| <div id="plot_static" class="plot" style="transform: translate(100px, 70px)" ></div> | |
| <div id="plot_trans" class="plot" style="transform: translate(100px, 50px)"></div> | |
| <!--scroll event listener--> | |
| <div id="scroll_overlay"></div> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script type="text/javascript"> | |
| let n_rows = 20, | |
| n_cols = 20, | |
| cells = d3.cross(d3.range(n_rows), d3.range(n_cols), (row, col) => { | |
| return {"row": row, "col": col, "datum": Math.random()}; | |
| }); | |
| // static and scroll-able plots | |
| createPlot("static", cells); | |
| createPlot("trans", cells); | |
| // scroll event listener | |
| d3.select("#scroll_overlay") | |
| .on("wheel", translatePlot); | |
| function createPlot(plot_type, data) { | |
| addGrid(plot_type); | |
| addCells(plot_type, data); | |
| } | |
| function addGrid(plot_type) { | |
| d3.select("#plot_" + plot_type) | |
| .append("div") | |
| .attr("class", "grid") | |
| .attr("id", "grid_" + plot_type); | |
| } | |
| function addCells(plot_type, data) { | |
| d3.select("#grid_" + plot_type) | |
| .selectAll("div") | |
| .data(data) | |
| .enter() | |
| .append("div") | |
| .attr("class", "cell") | |
| .style("left", cell => (cell.col * 17) + "px") | |
| .style("top", cell => (cell.row * 17) + "px") | |
| .style("background", cell => { | |
| if (plot_type == "static") { | |
| return cell.datum < 0.10 ? d3.interpolateViridis(Math.random()) : "lightgrey"; | |
| } else { | |
| return cell.datum > 0.90 ? d3.interpolateViridis(Math.random()) : "lightgrey"; | |
| } | |
| }); | |
| } | |
| function translatePlot() { | |
| // prevent default scrolling of browser window | |
| d3.event.preventDefault(); | |
| let wheel_delta = d3.event.wheelDelta, | |
| coords_re = /-?\d+/g, | |
| ty = d3.select("#plot_trans") | |
| .style("transform") | |
| .match(coords_re) | |
| .pop(), // last value is y translation; ref[1] | |
| plot_y_pos = ty - wheel_delta; | |
| // only scroll plot upwards from initial position and to a limited dist. | |
| if (plot_y_pos < 50 && plot_y_pos >= -250) { | |
| d3.select("#plot_trans") | |
| .style("transform", "translate(100px, " + plot_y_pos + "px)") | |
| } | |
| } | |
| // REFERENCES | |
| // [1] https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/matrix | |
| </script> | |
| </body> |
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