Image Demo Keep Constant Height Demo Experiment Run Experiment

Image Demo Keep Constant Height

Jaap Murre

Show image in a block with height at 100% of the block’s height,  with variable width. Suitable for showing images of printed words   of varying width.


Copy the function fixedheight() and place at the beginning of your script. You can then use it as is shown in the example.

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/*
    Show image in a block with height at 100% of the block's height,
    with variable width. Suitable for showing images of printed words
    of varying width.
    
    image_name (string): The name of the image with extension, e.g., cat.jpg
    block (Block object, optional): The Block object where you want to show
                                    the image. Default is the main.centerblock.
                                    
    Example:
    
        var b = addblock("center","center",100,20);
        b.preload("cat_200.jpg");
        b.preload("cat_400.jpg");
        image.await("preloading_completed");
        fixedheight("cat_200.jpg",b);
        b.setimage("cat_200.jpg");
        awaitkey(' ');
        fixedheight("cat_400.jpg",b);
        b.setimage("cat_400.jpg");
        awaitkey(' ');    

*/
function fixedheight(image_name,block) // e.g., cat.jpg
{
    block = block || main.centerblock;
    var n = b.getimagenode("cat_200.jpg");
    n.style["height"] = "100%";
    n.style["width"] = "auto";
}

var b = addblock("center","center",100,20);
b.preload("cat_200.jpg");
b.preload("cat_400.jpg");
image.await("preloading_completed");
fixedheight("cat_200.jpg",b);
b.setimage("cat_200.jpg");
awaitkey(' ');
fixedheight("cat_400.jpg",b);
b.setimage("cat_400.jpg");
awaitkey(' ');

You can download the files as follows: Click on the file (link) and then right-click and choose Save as... from the menu. Some media files (e.g., sound) will have a download button for this purpose.


cat_200.jpg

cat_400.jpg
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