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forked from Igathi's block: MB zoom circles in and out
forked from Igathi's block: MB zoom circles in and out
Created
October 31, 2019 06:55
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MB zoom circles in and out
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| .feature { | |
| fill: #ccc; | |
| cursor: pointer; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var active = d3.select(null); | |
| var objh = 20; | |
| var width = window.innerWidth; | |
| var height = window.innerHeight; | |
| var jsonCircles = [ | |
| { "x": 50, "y": 50, "radius": 20, "color" : "limegreen" }, | |
| { "x": 100, "y": 50, "radius": 20, "color" : "purple"}, | |
| { "x": 150, "y": 50, "radius": 20, "color" : "orangered"}, | |
| { "x": 200, "y": 50, "radius": 20, "color" : "skyblue"} | |
| ]; | |
| var zoom = d3.zoom() | |
| .on("zoom", zoomed); | |
| var initialTransform = d3.zoomIdentity | |
| .translate(0,0) | |
| .scale(1.0); | |
| var svg = d3.select("body").append("svg") | |
| svg.attr("width", width) | |
| .attr("height", height) | |
| .on("click", stopped, true); | |
| svg.append("rect") | |
| .attr("class", "background") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .style("fill", "white") | |
| .style("stroke", "black") | |
| .on("click", reset); | |
| var g = svg.append("g"); | |
| svg | |
| .call(zoom) // delete this line to disable free zooming | |
| .call(zoom.transform, initialTransform); | |
| var circles = g.selectAll("circle") | |
| .data(jsonCircles) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", function (d) { return d.x; }) | |
| .attr("cy", function (d) { return d.y; }) | |
| .attr("r", function (d) { return d.radius;}) | |
| .style("fill", function(d) { return d.color;}) | |
| .attr("class", "feature") | |
| .on("click", clicked);; | |
| function clicked(d) { | |
| if (active.node() === this) return reset(); | |
| active.classed("active", false); | |
| active = d3.select(this).classed("active", true); | |
| dx = d.radius | |
| dy = d.radius | |
| x = d.x | |
| y = d.y | |
| scale = Math.max(1, Math.min(height/objh/2, 0.9 / Math.max(dx / width, dy / height))), | |
| translate = [width / 2 - scale * x, height / 2 - scale * y]; | |
| console.log("width"); | |
| var transform = d3.zoomIdentity | |
| .translate(translate[0], translate[1]) | |
| .scale(scale); | |
| svg.transition() | |
| .duration(750) | |
| .call(zoom.transform, transform); | |
| } | |
| function reset() { | |
| active.classed("active", false); | |
| active = d3.select(null); | |
| svg.transition() | |
| .duration(750) | |
| .call(zoom.transform, initialTransform); | |
| } | |
| function zoomed() { | |
| var transform = d3.event.transform; | |
| g.style("stroke-width", 1.5 / transform.k + "px"); | |
| g.attr("transform", transform); | |
| } | |
| // If the drag behavior prevents the default click, | |
| // also stop propagation so we don’t click-to-zoom. | |
| function stopped() { | |
| if (d3.event.defaultPrevented) d3.event.stopPropagation(); | |
| } | |
| </script> |
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