From 157dc9fd1058d522f3cd8fc92df7482358c70ff8 Mon Sep 17 00:00:00 2001 From: Jason Davies Date: Thu, 13 Dec 2012 14:53:46 +0000 Subject: [PATCH] Optimise d3_geo_clip. --- d3.js | 104 +++++++++++++++++---------------- d3.min.js | 8 +-- src/geo/clip.js | 152 ++++++++++++++++++++++++++---------------------- 3 files changed, 140 insertions(+), 124 deletions(-) diff --git a/d3.js b/d3.js index 6143474e..c1672486 100644 --- a/d3.js +++ b/d3.js @@ -5429,23 +5429,34 @@ } function d3_geo_clip(pointVisible, clipLine, interpolate) { return function(listener) { - var line = clipLine(listener), polygon = [], ring; + var line = clipLine(listener); var clip = { point: point, lineStart: lineStart, lineEnd: lineEnd, polygonStart: function() { - clip.point = pointPolygon; - clip.lineStart = linePolygon; - clip.lineEnd = lineEndPolygon; + clip.point = pointRing; + clip.lineStart = ringStart; + clip.lineEnd = ringEnd; + invisible = false; + invisibleArea = visibleArea = 0; + segments = []; + listener.polygonStart(); }, polygonEnd: function() { clip.point = point; clip.lineStart = lineStart; clip.lineEnd = lineEnd; - d3_geo_clipPolygon(polygon, clipLine, interpolate, listener); - polygon = []; - ring = null; + segments = d3.merge(segments); + if (segments.length) { + d3_geo_clipPolygon(segments, interpolate, listener); + } else if (visibleArea < -ε2 || invisible && invisibleArea < -ε2) { + listener.lineStart(); + interpolate(null, null, 1, listener); + listener.lineEnd(); + } + listener.polygonEnd(); + segments = null; }, sphere: function() { listener.polygonStart(); @@ -5455,16 +5466,12 @@ listener.polygonEnd(); } }; - return clip; function point(λ, φ) { if (pointVisible(λ, φ)) listener.point(λ, φ); } function pointLine(λ, φ) { line.point(λ, φ); } - function pointPolygon(λ, φ) { - ring.push([ λ, φ ]); - } function lineStart() { clip.point = pointLine; line.lineStart(); @@ -5473,46 +5480,44 @@ clip.point = point; line.lineEnd(); } - function linePolygon() { - polygon.push(ring = []); + var segments, visibleArea, invisibleArea, invisible; + var buffer = d3_geo_clipBufferListener(), ringListener = clipLine(buffer), ring; + function pointRing(λ, φ) { + ringListener.point(λ, φ); + ring.push([ λ, φ ]); } - function lineEndPolygon() { - ring.push(ring[0]); + function ringStart() { + ringListener.lineStart(); + ring = []; } + function ringEnd() { + pointRing(ring[0][0], ring[0][1]); + ringListener.lineEnd(); + var clean = ringListener.clean(), ringSegments = buffer.buffer(), segment, n = ringSegments.length; + if (!n) { + invisible = true; + invisibleArea += d3_geo_clipAreaRing(ring, d3_geo_clipRotationInvisible); + ring = null; + return; + } + ring = null; + if (clean & 1) { + segment = ringSegments[0]; + visibleArea += d3_geo_clipAreaRing(segment, d3_geo_clipRotation); + var n = segment.length - 1, i = -1, point; + listener.lineStart(); + while (++i < n) listener.point((point = segment[i])[0], point[1]); + listener.lineEnd(); + return; + } + if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift())); + segments.push(ringSegments.filter(d3_geo_clipSegmentLength1)); + } + return clip; }; } - function d3_geo_clipPolygon(polygon, clipRing, interpolate, listener) { - var subject = [], clip = [], segments = [], visibleArea = 0, invisibleArea = 0, invisible = false, buffer = d3_geo_clipBufferListener(), ringListener = clipRing(buffer); - listener.polygonStart(); - var segments = d3.merge(polygon.map(function(ring) { - ringListener.lineStart(); - ring.forEach(function(point) { - ringListener.point(point[0], point[1]); - }); - ringListener.lineEnd(); - var clean = ringListener.clean(), ringSegments = buffer.buffer(), segment, n = ringSegments.length; - if (!n) { - invisible = true; - invisibleArea += d3_geo_clipAreaRing(ring, d3_geo_clipRotationInvisible); - return []; - } - if (clean & 1) { - segment = ringSegments[0]; - visibleArea += d3_geo_clipAreaRing(segment, d3_geo_clipRotation); - var n = segment.length - 1, i = -1, point; - listener.lineStart(); - while (++i < n) listener.point((point = segment[i])[0], point[1]); - listener.lineEnd(); - return []; - } - if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift())); - return ringSegments.filter(d3_geo_clipSegmentLength1); - })); - if (!segments.length && (visibleArea < -ε2 || invisible && invisibleArea < -ε2)) { - listener.lineStart(); - interpolate(null, null, 1, listener); - listener.lineEnd(); - } + function d3_geo_clipPolygon(segments, interpolate, listener) { + var subject = [], clip = []; segments.forEach(function(segment) { var n = segment.length; if (n <= 1) return; @@ -5557,11 +5562,11 @@ clip.sort(d3_geo_clipSort); d3_geo_clipLinkCircular(subject); d3_geo_clipLinkCircular(clip); - if (!subject.length) return listener.polygonEnd(); + if (!subject.length) return; var start = subject[0], current, points, point; while (1) { current = start; - while (current.visited) if ((current = current.next) === start) return listener.polygonEnd(); + while (current.visited) if ((current = current.next) === start) return; points = current.points; listener.lineStart(); do { @@ -5587,7 +5592,6 @@ } while (!current.visited); listener.lineEnd(); } - listener.polygonEnd(); } function d3_geo_clipLinkCircular(array) { if (!(n = array.length)) return; diff --git a/d3.min.js b/d3.min.js index 40f46239..f5f69a68 100644 --- a/d3.min.js +++ b/d3.min.js @@ -1,4 +1,4 @@ -(function(){function t(t){return t.target}function n(t){return t.source}function e(t,n){try{for(var e in n)Object.defineProperty(t.prototype,e,{value:n[e],enumerable:!1})}catch(r){t.prototype=n}}function r(t){var n=-1,e=t.length,r=[];while(e>++n)r.push(t[n]);return r}function i(t){return Array.prototype.slice.call(t)}function u(){}function a(t){return t}function o(){return!0}function l(t){return typeof t=="function"?t:function(){return t}}function c(t,n,e){return function(){var r=e.apply(n,arguments);return 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d3_geo_clipPolygon(polygon, clipLine, interpolate, listener); - polygon = []; - ring = null; + + segments = d3.merge(segments); + if (segments.length) { + d3_geo_clipPolygon(segments, interpolate, listener); + } else if (visibleArea < -ε2 || invisible && invisibleArea < -ε2) { + listener.lineStart(); + interpolate(null, null, 1, listener); + listener.lineEnd(); + } + listener.polygonEnd(); + segments = null; }, sphere: function() { listener.polygonStart(); @@ -30,15 +40,69 @@ function d3_geo_clip(pointVisible, clipLine, interpolate) { } }; - return clip; - function point(λ, φ) { if (pointVisible(λ, φ)) listener.point(λ, φ); } function pointLine(λ, φ) { line.point(λ, φ); } - function pointPolygon(λ, φ) { ring.push([λ, φ]); } function lineStart() { clip.point = pointLine; line.lineStart(); } function lineEnd() { clip.point = point; line.lineEnd(); } - function linePolygon() { polygon.push(ring = []); } - function lineEndPolygon() { ring.push(ring[0]); } + + var segments, + visibleArea, + invisibleArea, + invisible; + + var buffer = d3_geo_clipBufferListener(), + ringListener = clipLine(buffer), + ring; + + function pointRing(λ, φ) { + ringListener.point(λ, φ); + ring.push([λ, φ]); + } + + function ringStart() { + ringListener.lineStart(); + ring = []; + } + + function ringEnd() { + pointRing(ring[0][0], ring[0][1]); + ringListener.lineEnd(); + + var clean = ringListener.clean(), + ringSegments = buffer.buffer(), + segment, + n = ringSegments.length; + + // TODO compute on-the-fly? + if (!n) { + invisible = true; + invisibleArea += d3_geo_clipAreaRing(ring, d3_geo_clipRotationInvisible); + ring = null; + return; + } + ring = null; + + // No intersections. + // TODO compute on-the-fly? + if (clean & 1) { + segment = ringSegments[0]; + visibleArea += d3_geo_clipAreaRing(segment, d3_geo_clipRotation); + var n = segment.length - 1, + i = -1, + point; + listener.lineStart(); + while (++i < n) listener.point((point = segment[i])[0], point[1]); + listener.lineEnd(); + return; + } + + // Rejoin connected segments. + if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift())); + + segments.push(ringSegments.filter(d3_geo_clipSegmentLength1)); + } + + return clip; }; } @@ -49,60 +113,9 @@ function d3_geo_clip(pointVisible, clipLine, interpolate) { // // This is used by both d3_geo_circleClip and d3_geo_cut, each providing // different functions for clipRing and interpolate. -function d3_geo_clipPolygon(polygon, clipRing, interpolate, listener) { +function d3_geo_clipPolygon(segments, interpolate, listener) { var subject = [], - clip = [], - segments = [], - visibleArea = 0, - invisibleArea = 0, - invisible = false, - buffer = d3_geo_clipBufferListener(), - ringListener = clipRing(buffer); - - listener.polygonStart(); - - var segments = d3.merge(polygon.map(function(ring) { - ringListener.lineStart(); - ring.forEach(function(point) { - ringListener.point(point[0], point[1]); - }); - ringListener.lineEnd(); - - var clean = ringListener.clean(), - ringSegments = buffer.buffer(), - segment, - n = ringSegments.length; - - if (!n) { - invisible = true; - invisibleArea += d3_geo_clipAreaRing(ring, d3_geo_clipRotationInvisible); - return []; - } - - // No intersections. - if (clean & 1) { - segment = ringSegments[0]; - visibleArea += d3_geo_clipAreaRing(segment, d3_geo_clipRotation); - var n = segment.length - 1, - i = -1, - point; - listener.lineStart(); - while (++i < n) listener.point((point = segment[i])[0], point[1]); - listener.lineEnd(); - return []; - } - - // Rejoin connected segments. - if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift())); - - return ringSegments.filter(d3_geo_clipSegmentLength1); - })); - - if (!segments.length && (visibleArea < -ε2 || invisible && invisibleArea < -ε2)) { - listener.lineStart(); - interpolate(null, null, 1, listener); - listener.lineEnd(); - } + clip = []; segments.forEach(function(segment) { var n = segment.length; @@ -123,7 +136,7 @@ function d3_geo_clipPolygon(polygon, clipRing, interpolate, listener) { clip.sort(d3_geo_clipSort); d3_geo_clipLinkCircular(subject); d3_geo_clipLinkCircular(clip); - if (!subject.length) return listener.polygonEnd(); + if (!subject.length) return; var start = subject[0], current, points, @@ -131,7 +144,7 @@ function d3_geo_clipPolygon(polygon, clipRing, interpolate, listener) { while (1) { // Find first unvisited intersection. current = start; - while (current.visited) if ((current = current.next) === start) return listener.polygonEnd(); + while (current.visited) if ((current = current.next) === start) return; points = current.points; listener.lineStart(); do { @@ -157,7 +170,6 @@ function d3_geo_clipPolygon(polygon, clipRing, interpolate, listener) { } while (!current.visited); listener.lineEnd(); } - listener.polygonEnd(); } function d3_geo_clipLinkCircular(array) {