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# veltman/CA.json

Last active September 21, 2016 13:38
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Jigsaw morphing

Tweening between a single polygon (California) and multiple polygons (Hawaii). The basic steps:

1. Draw a relaxed Voronoi diagram over the single polygon with a bunch of random points.
2. Traverse the graph and assign cells to islands one at a time, keeping the groups contiguous and roughly proportional in area.
3. Convert the cells to a topology using Mike Bostock's method and merge each group.
4. Align the resulting puzzle piece polygon with the destination island for smoother animation using this method.

This isn't totally robust - bad Voronoi luck can result in a weird clipping result that leaves out a chunk. But it works... almost all the time? The breadth-first search of all the cells is also way slower than it needs to be. A hex grid would probably be a lot simpler.

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 (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o=-eps},pointBetween:function(p,left,right){var d_py_ly=p[1]-left[1];var d_rx_lx=right[0]-left[0];var d_px_lx=p[0]-left[0];var d_ry_ly=right[1]-left[1];var dot=d_px_lx*d_rx_lx+d_py_ly*d_ry_ly;if(dot-eps)return false;return true},pointsSameX:function(p1,p2){return Math.abs(p1[0]-p2[0])0})}function checkIntersection(ev1,ev2){var seg1=ev1.seg;var seg2=ev2.seg;var a1=seg1.start;var a2=seg1.end;var b1=seg2.start;var b2=seg2.end;if(buildLog)buildLog.checkIntersection(seg1,seg2);var i=eps.linesIntersect(a1,a2,b1,b2);if(i===false){if(!eps.pointsCollinear(a1,a2,b1))return false;if(eps.pointsSame(a1,b2)||eps.pointsSame(a2,b1))return false;var a1_equ_b1=eps.pointsSame(a1,b1);var a2_equ_b2=eps.pointsSame(a2,b2);if(a1_equ_b1&&a2_equ_b2)return ev2;var a1_between=!a1_equ_b1&&eps.pointBetween(a1,b1,b2);var a2_between=!a2_equ_b2&&eps.pointBetween(a2,b1,b2);if(a1_equ_b1){if(a2_between){eventDivide(ev2,a2)}else{eventDivide(ev1,b2)}return ev2}else if(a1_between){if(!a2_equ_b2){if(a2_between){eventDivide(ev2,a2)}else{eventDivide(ev1,b2)}}eventDivide(ev2,a1)}}else{if(i.alongA===0){if(i.alongB===-1)eventDivide(ev1,b1);else if(i.alongB===0)eventDivide(ev1,i.pt);else if(i.alongB===1)eventDivide(ev1,b2)}if(i.alongB===0){if(i.alongA===-1)eventDivide(ev2,a1);else if(i.alongA===0)eventDivide(ev2,i.pt);else if(i.alongA===1)eventDivide(ev2,a2)}}return false}var segments=[];while(!event_root.isEmpty()){var ev=event_root.getHead();if(buildLog)buildLog.vert(ev.pt[0]);if(ev.isStart){if(buildLog)buildLog.segmentNew(ev.seg,ev.primary);var surrounding=statusFindSurrounding(ev);var above=surrounding.before?surrounding.before.ev:null;var below=surrounding.after?surrounding.after.ev:null;if(buildLog){buildLog.tempStatus(ev.seg,above?above.seg:false,below?below.seg:false)}function checkBothIntersections(){if(above){var eve=checkIntersection(ev,above);if(eve)return eve}if(below)return checkIntersection(ev,below);return false}var eve=checkBothIntersections();if(eve){if(selfIntersection){var toggle;if(ev.seg.myFill.below===null)toggle=true;else toggle=ev.seg.myFill.above!==ev.seg.myFill.below;if(toggle)eve.seg.myFill.above=!eve.seg.myFill.above}else{eve.seg.otherFill=ev.seg.myFill}if(buildLog)buildLog.segmentUpdate(eve.seg);ev.other.remove();ev.remove()}if(event_root.getHead()!==ev){if(buildLog)buildLog.rewind(ev.seg);continue}if(selfIntersection){var toggle;if(ev.seg.myFill.below===null)toggle=true;else toggle=ev.seg.myFill.above!==ev.seg.myFill.below;if(!below){ev.seg.myFill.below=primaryPolyInverted}else{ev.seg.myFill.below=below.seg.myFill.above}if(toggle)ev.seg.myFill.above=!ev.seg.myFill.below;else ev.seg.myFill.above=ev.seg.myFill.below}else{if(ev.seg.otherFill===null){var inside;if(!below){inside=ev.primary?secondaryPolyInverted:primaryPolyInverted}else{if(ev.primary===below.primary)inside=below.seg.otherFill.above;else inside=below.seg.myFill.above}ev.seg.otherFill={above:inside,below:inside}}}if(buildLog){buildLog.status(ev.seg,above?above.seg:false,below?below.seg:false)}ev.other.status=surrounding.insert(LinkedList.node({ev:ev}))}else{var st=ev.status;if(st===null){throw new Error("PolyBool: Zero-length segment detected; your epsilon is "+"probably too small or too large")}if(status_root.exists(st.prev)&&status_root.exists(st.next))checkIntersection(st.prev.ev,st.next.ev);if(buildLog)buildLog.statusRemove(st.ev.seg);st.remove();if(!ev.primary){var s=ev.seg.myFill;ev.seg.myFill=ev.seg.otherFill;ev.seg.otherFill=s}segments.push(ev.seg)}event_root.getHead().remove()}if(buildLog)buildLog.done();return segments}if(!selfIntersection){return{calculate:function(segments1,inverted1,segments2,inverted2){segments1.forEach(function(seg){eventAddSegment(seg,true)});segments2.forEach(function(seg){eventAddSegment(seg,false)});return calculate(inverted1,inverted2)}}}return{addRegion:function(region){var pt1;var pt2=region[region.length-1];for(var i=0;i