Tiles-Identifizierung bei aktuellem Bildausschnitt bzw. Ansicht

<events onviewchange="show_current_rect()" />


<action name="show_current_rect">
    <!-- the resoltion levels are sorted, the highest index is the largest one -->
    sub(largestres, image.level.count, 1);


    <!-- get the size of the highest resolution -->
    copy(fullwidth,  image.level[%largestres].tiledimagewidth );
    copy(fullheight, image.level[%largestres].tiledimageheight );


    <!-- get the hfov and caluclate the vfov -->
    copy(full_hfov, image.hfov);
    mul(full_vfov, full_hfov, fullheight);
    div(full_vfov, full_vfov, fullwidth);


    <!-- get the current field of view -->
    mul(half_hfov, view.hfov, 0.5);
    mul(half_vfov, view.vfov, 0.5);


    <!-- get the current center -->
    copy(hcenter, view.hlookat);
    copy(vcenter, view.vlookat);


    <!-- calculate the edges -->
    sub(left,   hcenter, half_hfov);
    sub(top,    vcenter, half_vfov);
    add(right,  hcenter, half_hfov);
    add(bottom, vcenter, half_vfov);


    <!-- 'normalize' to -0.5 to +0.5 -->
    div(left,   left,   full_hfov);
    div(right,  right,  full_hfov);
    div(top,    top,    full_vfov);
    div(bottom, bottom, full_vfov);


    <!-- shift to 0.0 to 1.0 -->
    add(left,   left,   0.5);
    add(right,  right,  0.5);
    add(top,    top,    0.5);
    add(bottom, bottom, 0.5);


    <!-- scale to full resolution coordniates -->
    mul(left,   left,   fullwidth);
    mul(right,  right,  fullwidth);
    mul(top,    top,    fullheight);
    mul(bottom, bottom, fullheight);


    <!-- remove decimal places -->
    roundval(left);
    roundval(right);
    roundval(top);
    roundval(bottom);


    <!-- fix inaccuracies / out of range values -->
    if(left LT 0, set(left,0));
    if(top  LT 0, set(top,0));
    if(right GE fullwidth, sub(right,fullwidth,1));
    if(bototm GE fullheight, sub(bottom,fullheight,1));


    <!-- open the krpano log and show the coordinates -->
    showlog();
    trace('view = ', left,'/',top,' - ',right,'/',bottom);
</action>