htdocs/cropper/smokeping-zoom.js


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/*++ from bonsai.js ++ urlObj  +++++++++++++++++++++++++++++++++++++++++*/
function urlObj(url) {
   var urlBaseAndParameters;

   urlBaseAndParameters = url.split("?"); 
   this.urlBase = urlBaseAndParameters[0];
   this.urlParameters = urlBaseAndParameters[1].split(/[;&]/);

   this.getUrlBase = urlObjGetUrlBase;
}

/*++ from bonsai.js ++ urlObjGetUrlBase  +++++++++++++++++++++++++++++++*/

function urlObjGetUrlBase() {
   return this.urlBase;
}


// example with minimum dimensions
var myCropper;

var StartEpoch = 0;
var EndEpoch = 0;


function changeRRDImage(coords,dimensions){

    var SelectLeft = Math.min(coords.x1,coords.x2);

    var SelectRight = Math.max(coords.x1,coords.x2);

    if (SelectLeft == SelectRight)
         return; // abort if nothing is selected.

    var RRDLeft  = 67;        // difference between left border of RRD image and content
    var RRDRight = 26;        // difference between right border of RRD image and content
    var RRDImgWidth  = $('zoom').getDimensions().width;       // Width of the Smokeping RRD Graphik
    var RRDImgUsable = RRDImgWidth - RRDRight - RRDLeft;  
    var form = $('range_form');   
    
    if (StartEpoch == 0)
        StartEpoch = +$F('epoch_start');
   
    if (EndEpoch  == 0)
        EndEpoch = +$F('epoch_end');

    var DivEpoch = EndEpoch - StartEpoch; 

    var Target = $F('target');

    // construct Image URL
    var myURLObj = new urlObj(document.URL); 

    var myURL = myURLObj.getUrlBase(); 

    // Generate Selected Range in Unix Timestamps
    var LeftFactor = 1;
    var RightFactor = 1;

    if (SelectLeft < RRDLeft)
        LeftFactor = 10;        

    var NewStartEpoch = Math.floor(StartEpoch + (SelectLeft  - RRDLeft) * DivEpoch / RRDImgUsable * LeftFactor );

    if (SelectRight > RRDImgWidth - RRDRight)
        RightFactor = 10;

    EndEpoch  =  Math.ceil(StartEpoch + (SelectRight - RRDLeft) * DivEpoch / RRDImgUsable * RightFactor);

    StartEpoch = NewStartEpoch;

    $('zoom').src = myURL + '?displaymode=a;start=' + StartEpoch + ';end=' + EndEpoch + ';target=' + Target;

    myCropper.setParams();

};

Event.observe( 
           window, 
           'load', 
           function() { 
               myCropper = new Cropper.Img( 
                               'zoom', 
                                        { 
                                                minHeight: $('zoom').getDimensions().height,
                                                maxHeight: $('zoom').getDimensions().height,
                                                onEndCrop: changeRRDImage
                                        } 
                                ) 
                   }
           );