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October 9, 2017 12:14
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d3 v4 - detect click coordinates in zoomed area
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="https://d3js.org/d3.v4.js"></script> | |
| <style> | |
| body {margin: 0 } | |
| svg { background-color: #86B2EB; } | |
| svg circle.old { fill: green; } | |
| svg circle.new { fill: blue; } | |
| </style> | |
| </head> | |
| <body> | |
| <svg width="960" height="500"></svg> | |
| <h4>Zoom with mousewheel and click to add circle</h4> | |
| <script> | |
| let svg = d3.select('svg'), | |
| container = svg.append('g'), | |
| data = [ | |
| { x: 50, y: 110, id: 100 }, | |
| { x: 100, y: 100, id: 101 }, | |
| { x: 650, y: 410, id: 102 } | |
| ]; | |
| function init() { | |
| let zoom = d3.zoom() | |
| .scaleExtent([0.25, 2.25]) | |
| .on("zoom", () => { | |
| container.attr("transform", d3.event.transform); | |
| }); | |
| svg.call(zoom) | |
| .on("dblclick.zoom", null) | |
| svg.on('click', d => { | |
| let x = d3.event.x; | |
| let y = d3.event.y; | |
| // TODO - get new x,y coords affected by current zoom ration | |
| // x = zoom ... | |
| // y = zoom ... | |
| data.push({ x, y, id: Math.random() }); | |
| redraw(); | |
| }); | |
| } | |
| function redraw() { | |
| let grp = container.selectAll('circle') | |
| .data(data, d => d.id) | |
| .attr('class', 'old') | |
| grp.exit().remove(); // exit > remove > g | |
| let grpEnter = grp.enter() | |
| let group = grpEnter | |
| group.append('circle') | |
| .attr('class', 'new') | |
| .attr('r', 15) | |
| .attr('cx', d => d.x).attr('cy', d => d.y) | |
| grp = grpEnter.merge(grp); | |
| } | |
| init(); | |
| redraw(); | |
| </script> | |
| </body> | |
| </html> |
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