tileUtils.js

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define(["dojo/_base/array","dojo/has","./kernel","./geometry/Point","./geometry/Extent"],function(o,e,t,n,i){function r(o,e,t){var n,i,r,a,l=o.width,f=o.height,h=t.xmax-t.xmin,s=t.ymax-t.ymin,x=o.__tileInfo===e,u=x?o.getMinZoom():-1,d=x?o.getMaxZoom():-1,g=-1,y=e.lods,c=Math.abs;for(u=u>-1?u:0,d=d>-1?d:y.length-1,n=u;n<=d;n++)if(r=y[n]){if(a=c(h>s?s-f*r.resolution:h-l*r.resolution),!(g<0||a<=g))break;i=r,g=a}return i}function a(o,e,t){var n=t.resolution,r=(e.xmin+e.xmax)/2,a=(e.ymin+e.ymax)/2,l=o.width/2*n,f=o.height/2*n;return new i(r-l,a-f,r+l,a+f,e.spatialReference)}function l(o,e,t,n){var i=n.resolution,r=e.width,a=e.height,l=e.origin,f=o.__visibleDelta,h=Math.floor,s=r*i,x=a*i,u=h((l.y-t.y)/x),d=h((t.x-l.x)/s),g=l.x+d*s,y=l.y-u*x;return{point:t,coords:{row:u,col:d},offsets:{x:h(Math.abs((t.x-g)*r/s))+f.x,y:h(Math.abs((t.y-y)*a/x))+f.y}}}var f={_addFrameInfo:function(e,t){var n,i,r,a=2*t.origin[1],l=t.origin[0],f=e.origin.x,h=e.width;o.forEach(e.lods,function(o){n=Math.round(a/o.resolution),i=Math.ceil(n/h),r=Math.floor((l-f)/(h*o.resolution)),o._frameInfo||(o._frameInfo=[i,r,r+i-1,n])})},getContainingTileCoords:function(o,e,t){var n=o.origin,i=t.resolution,r=o.width*i,a=o.height*i,l=Math.floor((e.x-n.x)/r);return{row:Math.floor((n.y-e.y)/a),col:l}},getCandidateTileInfo:function(o,e,t){var i=r(o,e,t),f=a(o,t,i);return{tile:l(o,e,new n(f.xmin,f.ymax,t.spatialReference),i),lod:i,extent:f}},getTileExtent:function(o,e,t,n){var r=o.origin,a=o.lods[e],l=a.resolution,f=o.width,h=o.height;return new i(n*l*f+r.x,r.y-(t+1)*l*h,(n+1)*l*f+r.x,r.y-t*l*h,o.spatialReference)}};return e("extend-esri")&&(t.TileUtils=f),f});