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Lazo Brush
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| <!DOCTYPE html> | |
| <svg width="960" height="400"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="./pointinpolygon.js"></script> | |
| <style> | |
| path.lazo { | |
| fill: #ddd; | |
| stroke-width: 1px; | |
| stroke: #ccc; | |
| fill-opacity: 0.3; | |
| } | |
| svg:hover{ | |
| cursor:crosshair; | |
| } | |
| </style> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"), | |
| margin = {top: 20, right: 30, bottom: 30, left: 40}, | |
| radius = 16, | |
| xDomain = [-500, 500], | |
| yDomain = [0, 100]; | |
| var color = d3.scaleOrdinal() | |
| .range(d3.schemeCategory20); | |
| var xScale = d3.scaleLinear() | |
| .domain(xDomain) | |
| .range([0, width - margin.left - margin.right]); | |
| var yScale = d3.scaleLinear() | |
| .domain(yDomain) | |
| .range([height, 0]); | |
| var xAxis = d3.axisBottom(xScale); | |
| var yAxis = d3.axisLeft(yScale); | |
| var chartContainer = svg | |
| .attr('width', (width + margin.right + margin.left)) | |
| .attr('height', (height + margin.top + margin.bottom)) | |
| .append('g') | |
| .attr('id', 'chartcontainer') | |
| .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')'); | |
| var xAxisEl = chartContainer.append('g') | |
| .attr('class', 'x axis') | |
| .attr('transform', 'translate(0,' + height + ')') | |
| .call(xAxis) | |
| var yAxisEl = chartContainer.append('g') | |
| .attr('class', 'y axis') | |
| .call(yAxis); | |
| var drawarea = chartContainer.append('g') | |
| .attr('class', 'draw-area') | |
| .attr('width', width) | |
| .attr('height', height) | |
| drawSamplePoints(); | |
| initLazoBrush(); | |
| function initLazoBrush() { | |
| var lineFn = d3.line().curve(d3.curveBasisClosed); | |
| var _kx = 0, _ky = 0; | |
| var lazoMove = d3.drag() | |
| .on("start", function (d, i, j) { | |
| var _el = d3.select(j[i]).attr("txy").split(","); | |
| _kx = d3.event.x; | |
| _ky = d3.event.y; | |
| }) | |
| .on("drag", function (d, i, j) { | |
| var _x = d3.event.x - _kx; | |
| var _y = d3.event.y - _ky; | |
| _kx = d3.event.x; | |
| _ky = d3.event.y; | |
| console.log(_x, ' ', _y); | |
| lazoPoints.forEach(function(_p){ | |
| _p[0] = _p[0] + _x; | |
| _p[1] = _p[1] + _y; | |
| }) | |
| drawPath(); | |
| drawarea.selectAll("circle") | |
| .style("fill", function (d, i, j) { | |
| return filter(d, i, lazoPoints); | |
| }) | |
| }) | |
| var lazo = chartContainer.append("path") | |
| .attr("class", "lazo") | |
| .style("pointer-events", "all") | |
| .call(lazoMove) | |
| var lazoPoints = []; | |
| var dragStart = function () { | |
| lazoPoints = []; | |
| lazo.attr("txy",[0,0]) | |
| .attr("transform", "translate(0,0)") | |
| }; | |
| var drawPath = function () { | |
| lazo.datum(lazoPoints) | |
| .attr("d", lineFn); | |
| }; | |
| var dragMove = function () { | |
| lazoPoints.push([d3.event.x, d3.event.y]); | |
| drawarea.selectAll("circle") | |
| .style("fill", function (d, i, j) { | |
| return filter(d, i, lazoPoints); | |
| }) | |
| drawPath(); | |
| }; | |
| var dragEnd = function () { | |
| //lazoPoints.push(lazoPoints[lazoPoints.length-1]) | |
| // lazoPoints.push(lazoPoints[0]) | |
| // drawPath(); | |
| }; | |
| var dragFn = d3.drag() | |
| .on("start", dragStart) | |
| .on("drag", dragMove) | |
| .on("end", dragEnd); | |
| svg.call(dragFn); | |
| } | |
| function filter(d, i, lazoPoints) { | |
| return pointInPolygon([xScale(d.x), yScale(d.y)], lazoPoints) ? color(i) : "#efefef"; | |
| } | |
| function drawSamplePoints() { | |
| sampleData = d3.range(100).map(function () { | |
| return { | |
| x: Math.floor(Math.random() * (xDomain[1] - xDomain[0] - 40) + xDomain[0] + 40), | |
| y: Math.floor(Math.random() * (yDomain[1] - yDomain[0] - 10) + yDomain[0] + 10) | |
| }; | |
| }); | |
| drawarea.selectAll("circle") | |
| .data(sampleData) | |
| .enter().append("circle") | |
| .attr("cx", function (d) { | |
| return xScale(d.x); | |
| }) | |
| .attr("cy", function (d) { | |
| return yScale(d.y); | |
| }) | |
| .attr("opacity", 0.8) | |
| .style("pointer-events", "none") | |
| .attr("r", radius) | |
| .style("fill", function (d, i) { | |
| return color(i); | |
| }) | |
| .style("stroke", function (d, i) { | |
| return color(i); | |
| }) | |
| } | |
| </script> |
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| function pointInPolygon(point, vs) { | |
| // ray-casting algorithm based on | |
| // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html | |
| var x = point[0], y = point[1]; | |
| var inside = false; | |
| for (var i = 0, j = vs.length - 1; i < vs.length; j = i++) { | |
| var xi = vs[i][0], yi = vs[i][1]; | |
| var xj = vs[j][0], yj = vs[j][1]; | |
| var intersect = ((yi > y) != (yj > y)) | |
| && (x < (xj - xi) * (y - yi) / (yj - yi) + xi); | |
| if (intersect) inside = !inside; | |
| } | |
| return inside; | |
| }; |
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