Editing getPreviewCoordY - FilterMeisterWiki

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= getPreviewCoordY =

== Syntax ==
{{int getPreviewCoordY (void)}}

== Return ==
Returns the y coordinate in the image above which the mouse pointer is placed.

== Description ==
Together with ((getPreviewCoordX)) you can use it to get the coordinates of the mouse pointer above the image in the preview. The returned coordinates are already converted to image coordinates. But it is recommended to multiply the returned value with ((scaleFactor)) to get a coordinate relative to the full image and not just a coordinate relative to the e.g. 33% zoomed version of the image.

== Example ==
<code>
%ffp

ctl(0): STATICTEXT, "Please right click on the preview to set a cross.", Size=(100,20)

OnCtl(n):
{

if (n == CTL_PREVIEW && e == FME_RIGHTCLICKED_DOWN) {
    j0 = getPreviewCoordX() * scaleFactor;
    j1 = getPreviewCoordY() * scaleFactor;
    doAction(CA_PREVIEW);
  }

return false;
}

ForEveryTile:{

int g, h, z, color;
  int PreviewX = j0 / scaleFactor;
  int PreviewY = j1 / scaleFactor;

// Calculate color of the cross
  color = ( src(PreviewX, PreviewY, 0) + src(PreviewX, PreviewY, 1) + src(PreviewX, PreviewY, 2) )/3;
  if (color > 128 && color < 196) color = 0; 
  if (color > 64 && color < 128) color = 255;
  else color = 255-color;

// Display Cross
  if (doingProxy){
    for (z = 0; z < Z; z++){
      for (g = -7; g < 8; g++)
        if (g < -1 || g > 1) pset(PreviewX + g, PreviewY, z, color);
      for (h = -7; h < 8; h++)
        if (h < -1 || h > 1) pset(PreviewX, PreviewY + h, z, color );	
    }
  }

return true;
}
</code>

== See Also ==
((getPreviewCoordX)), ((getCtlCoord)), ((scaleFactor))

== Comments ==
Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

*Calling '''getPreviewCoordY()''' is equivalent to calling ((getCtlCoord))'''(CTL_PREVIEW, 1)'''.

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