This D3.js example shows how to create a selection rectangle that is usable on both desktop and touch devices.
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April 12, 2016 11:28
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D3.js rectangular selection
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| license: mit |
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| function rect(x, y, w, h) { | |
| return "M"+[x,y]+" l"+[w,0]+" l"+[0,h]+" l"+[-w,0]+"z"; | |
| } | |
| var width = 720, | |
| height = 540; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var selection = svg.append("path") | |
| .attr("class", "selection") | |
| .attr("visibility", "hidden"); | |
| var startSelection = function(start) { | |
| selection.attr("d", rect(start[0], start[0], 0, 0)) | |
| .attr("visibility", "visible"); | |
| }; | |
| var moveSelection = function(start, moved) { | |
| selection.attr("d", rect(start[0], start[1], moved[0]-start[0], moved[1]-start[1])); | |
| }; | |
| var endSelection = function(start, end) { | |
| selection.attr("visibility", "hidden"); | |
| }; | |
| svg.on("mousedown", function() { | |
| var subject = d3.select(window), parent = this.parentNode, | |
| start = d3.mouse(parent); | |
| startSelection(start); | |
| subject | |
| .on("mousemove.selection", function() { | |
| moveSelection(start, d3.mouse(parent)); | |
| }).on("mouseup.selection", function() { | |
| endSelection(start, d3.mouse(parent)); | |
| subject.on("mousemove.selection", null).on("mouseup.selection", null); | |
| }); | |
| }); | |
| svg.on("touchstart", function() { | |
| var subject = d3.select(this), parent = this.parentNode, | |
| id = d3.event.changedTouches[0].identifier, | |
| start = d3.touch(parent, id), pos; | |
| startSelection(start); | |
| subject | |
| .on("touchmove."+id, function() { | |
| if (pos = d3.touch(parent, id)) { | |
| moveSelection(start, pos); | |
| } | |
| }).on("touchend."+id, function() { | |
| if (pos = d3.touch(parent, id)) { | |
| endSelection(start, pos); | |
| subject.on("touchmove."+id, null).on("touchend."+id, null); | |
| } | |
| }); | |
| }); |
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| <!doctype html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>D3 rectangular selection</title> | |
| <style> | |
| .selection { | |
| fill: #ADD8E6; | |
| stroke: #ADD8E6; | |
| fill-opacity: 0.3; | |
| stroke-opacity: 0.7; | |
| stroke-width: 2; | |
| stroke-dasharray: 5, 5; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="//d3js.org/d3.v3.js"></script> | |
| <script src="draw.js"></script> | |
| </body> | |
| </html> |
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