Function: Resize & Center an Image

[kpsmith]

This functions is used to resize and center an image given a max size and a center location.

Essentially it uses an images height and width to determine it's aspect and then size it to fit a given max height and width parameters. It then will center the image based on an x & y coordinate passed in the function argument.

For this function to work correctly you will first need to determine the images width & Height (Variables: ImageWidth & ImageHeight) and then use the resulting variables from this function to set the images size and location (iheight, iwidth, CoordX, CoordY)

Thanks go to TJ Tigger for much of this...


This code would go in your global functions:

--***************************
--  RESIZE_CENTER Image FUNCTION
--***************************
function RESIZE_CENTER(maxwidth, maxheight, centerX, centerY)
--If width larger than height resize based on width
if (ImageWidth > ImageHeight) then

iwidth = maxwidth --set width to max specifed in function call
ratio = (ImageWidth / iwidth); -- determine ratio
iheight = (ImageHeight / ratio); -- set height based on ratio

--else height is larger and resize based on height
else
iheight = maxheight -- set height to max specified in function call
ratio = (ImageHeight / iheight); --determine ratio
iwidth = (ImageWidth / ratio); -- set width
end

-- Determine top left X & Y based on Image center coordinates sent in function call
CoordX = centerX - (iwidth / 2); 
CoordY = centerY - (iheight / 2);

end

Here is some sample code illustrating how this can be used in a project:

--Get Image Info 
ImageInfo = Image.GetFileInfo("AutoPlay\\Images\\indigorose.png"); 

--Get Files Image Dimensions 
ImageWidth = ImageInfo.Width 
ImageHeight = ImageInfo.Height 

--Call the function with max X,Y of 475 pixels and a Center of 456,245 

RESIZE_CENTER(475, 475, 456, 245) 

--Hide Image to make the changes
Image.SetVisible("Image", false); 

--Set Image Size based on function results 
Image.SetSize ("Image", iwidth, iheight); 

--Set Image position based on function results 
Image.SetPos("Image", CoordX, CoordY); 

--Load the image using the image path 
Image.Load ("Image", "AutoPlay\\Images\\indigorose.png"); 

--Set the image Visible again 
Image.SetVisible("Image", true);