Created
July 30, 2014 19:36
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Note Comments, why index variable (i) is zero after selection in `positionPoints` section ?
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>Besier Curve</title> | |
| <link rel="stylesheet" href="main.css"> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| circle { | |
| cursor: pointer; | |
| } | |
| circle:hover { | |
| fill : yellow; | |
| } | |
| path { | |
| stroke : black; | |
| stroke-width: 2; | |
| fill : none; | |
| } | |
| line { | |
| stroke : black; | |
| stroke-width: 1; | |
| } |
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| var bodyDom = d3.select('body'), | |
| svgWidth = 800, | |
| svgHeight = 800; | |
| var svg = bodyDom.append('svg') | |
| .attr('width', svgWidth) | |
| .attr('height', svgHeight); | |
| var Points = [ | |
| { control1 : [ 20, 20 ], control2 : [ 20, 20 ], dest : [ 20, 20 ] }, | |
| { control1 : [ 50, 50 ], control2 : [ 80, 100 ], dest : [ 100, 100 ] }, | |
| { control1 : [ 120, 130 ], control2 : [ 180, 240 ], dest : [ 300, 400 ] } | |
| ]; | |
| var drag = d3.behavior.drag() | |
| .origin(function (d) { | |
| var circle = d3.select(this); | |
| return { x : circle.attr('cx'), y : circle.attr('cy'), data : d }; | |
| }) | |
| .on('drag', function (d, i) { | |
| var circle = d3.select(this), | |
| name = circle.attr('name'); | |
| Points[i][name][0] = d3.event.x; | |
| Points[i][name][1] = d3.event.y; | |
| positionPoints(); | |
| }); | |
| //Starting point | |
| Points[0].control1 = Points[0].control2 = Points[0].dest; | |
| var GROUPS = []; | |
| function updatePoints() { | |
| var pointGroup = svg.selectAll('g') | |
| .data(Points, function (d) { | |
| return Points.indexOf(d); | |
| }) | |
| .enter() | |
| .append('g'); | |
| pointGroup.append('line'); | |
| pointGroup.append('line'); | |
| pointGroup.append('path'); | |
| controlStyles(pointGroup.append('circle'), 'control1'); | |
| controlStyles(pointGroup.append('circle'), 'control2'); | |
| controlStyles(pointGroup.append('circle'), 'dest', { | |
| fill : 'black' | |
| }); | |
| GROUPS = svg.selectAll('g')[0].map(function (group) { | |
| return d3.select(group); | |
| }); | |
| function controlStyles(ctrlPoint, pointName, styles) { | |
| var defaultStyles = { | |
| fill : '#ccc', | |
| stroke : 'blue', | |
| strokeWidth : 1, | |
| radius : 5 | |
| }; | |
| styles = extend(defaultStyles, styles); | |
| ctrlPoint | |
| .attr('name', pointName) | |
| .attr('fill', styles.fill) | |
| .attr('stroke', styles.stroke) | |
| .attr('stroke-width', styles.strokeWidth) | |
| .attr('r', styles.radius) | |
| .attr('style', function (d, i) { | |
| console.log(i); //not having problems: 1, 2, 3 | |
| }) | |
| .call(drag); | |
| return ctrlPoint; | |
| } | |
| } | |
| function positionPoints() { | |
| var groups = GROUPS; | |
| groups.forEach(function (group) { | |
| var line1 = group.select('line:nth-child(1)'), | |
| line2 = group.select('line:nth-child(2)') | |
| circles = group.selectAll('circle'), | |
| path = group.select('path'); | |
| line1 | |
| .attr('x1', function (d) { return d.control1[0]; }) | |
| .attr('y1', function (d) { return d.control1[1]; }) | |
| .attr('x2', function (d, i) { return getPrevious('dest', i)[0]; }) | |
| .attr('y2', function (d, i) { return getPrevious('dest', i)[1]; }); | |
| line2 | |
| .attr('x1', function (d) { return d.control2[0]; }) | |
| .attr('y1', function (d) { return d.control2[1]; }) | |
| .attr('x2', function (d) { return d.dest[0]; }) | |
| .attr('y2', function (d) { return d.dest[1]; }); | |
| circles.each(function (d) { | |
| var circle = d3.select(this), | |
| name = circle.attr('name'); | |
| circle.attr('cx', d[name][0]); | |
| circle.attr('cy', d[name][1]); | |
| }); | |
| path.attr('d', function (d, i) { | |
| console.log(i); // always zero | |
| var prevDest = getPrevious('dest', i); | |
| var pathData = | |
| 'M ' + prevDest[0] + ',' + prevDest[1] + | |
| 'C ' + d.control1[0] + ',' + d.control1[1] + ' ' + | |
| d.control2[0] + ',' + d.control2[1] + ' ' + | |
| d.dest[0] + ',' + d.dest[1]; | |
| return pathData; | |
| }); | |
| }); | |
| function getPrevious(what, i) { | |
| if (i === 0) i = 1; | |
| if (!what) return Points[i - 1]; | |
| return Points[i - 1][what]; | |
| } | |
| } | |
| updatePoints(); | |
| positionPoints(); | |
| function extend(base, data) { | |
| for (var key in data) { | |
| base[key] = data[key]; | |
| } | |
| return base; | |
| } |
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