diff options
Diffstat (limited to 'htdocs/leafletjs/ctxtextpath.js')
-rw-r--r-- | htdocs/leafletjs/ctxtextpath.js | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/htdocs/leafletjs/ctxtextpath.js b/htdocs/leafletjs/ctxtextpath.js new file mode 100644 index 0000000..c9389cb --- /dev/null +++ b/htdocs/leafletjs/ctxtextpath.js @@ -0,0 +1,35 @@ +(function() +{function dist2D(x1,y1,x2,y2) +{var dx=x2-x1;var dy=y2-y1;return Math.sqrt(dx*dx+dy*dy);} +CanvasRenderingContext2D.prototype.textOverflow="";CanvasRenderingContext2D.prototype.textJustify=false;CanvasRenderingContext2D.prototype.textStrokeMin=0;var state=[];var save=CanvasRenderingContext2D.prototype.save;CanvasRenderingContext2D.prototype.save=function() +{state.push({textOverflow:this.textOverflow,textJustify:this.textJustify,textStrokeMin:this.textStrokeMin,});save.call(this);} +var restore=CanvasRenderingContext2D.prototype.restore;CanvasRenderingContext2D.prototype.restore=function() +{restore.call(this);var s=state.pop();this.textOverflow=s.textOverflow;this.textJustify=s.textJustify;this.textStrokeMin=s.textStrokeMin;} +CanvasRenderingContext2D.prototype.textPath=function(text,path) +{var di,dpos=0;var pos=2;function pointAt(dl) +{if(!di||dpos+di<dl) +{for(;pos<path.length;) +{di=dist2D(path[pos-2],path[pos-1],path[pos],path[pos+1]);if(dpos+di>dl)break;pos+=2;if(pos>=path.length)break;dpos+=di;}} +var x,y,dt=dl-dpos;if(pos>=path.length) +{pos=path.length-2;} +if(!dt) +{x=path[pos-2];y=path[pos-1];} +else +{x=path[pos-2]+(path[pos]-path[pos-2])*dt/di;y=path[pos-1]+(path[pos+1]-path[pos-1])*dt/di;} +return[x,y,Math.atan2(path[pos+1]-path[pos-1],path[pos]-path[pos-2])];} +var letterPadding=this.measureText(" ").width*0.25;var d=0;for(var i=2;i<path.length;i+=2) +{d+=dist2D(path[i-2],path[i-1],path[i],path[i+1])} +if(d<this.minWidth)return;var nbspace=text.split(" ").length-1;if(this.textOverflow!="visible") +{if(d<this.measureText(text).width+(text.length-1+nbspace)*letterPadding) +{var overflow=(this.textOverflow=="ellipsis")?'\u2026':this.textOverflow||"";var dt=overflow.length-1;do +{if(text[text.length-1]===" ")nbspace--;text=text.slice(0,-1);}while(text&&d<this.measureText(text+overflow).width+(text.length+dt+nbspace)*letterPadding) +text+=overflow;}} +var start=0;switch(this.textJustify||this.textAlign) +{case true:case "center":case "end":case "right":{if(this.textJustify) +{start=0;letterPadding=(d-this.measureText(text).width)/(text.length-1+nbspace);} +else +{start=d-this.measureText(text).width-(text.length+nbspace)*letterPadding;if(this.textAlign=="center")start/=2;} +break;} +default:break;} +for(var t=0;t<text.length;t++) +{var letter=text[t];var wl=this.measureText(letter).width;var p=pointAt(start+wl/2);this.save();this.textAlign="center";this.translate(p[0],p[1]);this.rotate(p[2]);if(this.lineWidth>0.1)this.strokeText(letter,0,0);this.fillText(letter,0,0);this.restore();start+=wl+letterPadding*(letter==" "?2:1);}};})();
\ No newline at end of file |