[ka-Map-dev] [Bug 1307] New: Error when the base layer is not visible on certain scales...

[bugzilla-daemon at bugzilla.maptools.org]

http://bugzilla.maptools.org/show_bug.cgi?id=1307

           Summary: Error when the base layer is not visible on certain
                    scales...
           Product: ka-Map
           Version: 0.2
          Platform: PC
        OS/Version: Windows 2000
            Status: NEW
          Severity: normal
          Priority: P2
         Component: core
        AssignedTo: ka-map-dev at lists.maptools.org
        ReportedBy: pieter.roggemans at ewbl.vlaanderen.be


A javascript error (nullpointer) occurs if the base layer (index 0 in array) 
isn't visible at all scales.

The error occurs in kamap.js, line 1442.

Here is a possible bugfix.  I am not sure if this is the ideal bugfix... but it 
works (for me).

/**
 * internal function to check if images need to be wrapped
 */
kaMap.prototype.checkWrap = function()
{

    this.xOffset = safeParseInt(this.theInsideLayer.style.left) + 
this.nCurrentLeft - this.xOrigin;
    this.yOffset = safeParseInt(this.theInsideLayer.style.top) + 
this.nCurrentTop - this.yOrigin;

    while (this.xOffset > 0)
    {
        this.wrapR2L();
    }
    while (this.xOffset < -(this.nBuffer*this.tileWidth))
    {
        this.wrapL2R();
    }
    while (this.yOffset > -(this.nBuffer*this.tileHeight))
    {
        this.wrapB2T();
    }
    while (this.yOffset < -(2*this.nBuffer*this.tileHeight))
    {
        this.wrapT2B();
    }
    
    /* BUGFIX by PIEROG */
   	var layers = this.aMaps[this.currentMap].getLayers();
       
	if(layers != null)
	{		
		var img = layers[0].domObj.childNodes[0].style;
	    this.nCurrentTop = safeParseInt(img.top) + this.yOrigin;
		this.nCurrentLeft = safeParseInt(img.left) + this.xOrigin;
	}
}



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