Use Image checkpoint to test for an empty region

[DSmachineWorld]

I have an area on my web page to test, which is basically a representation of a chart with a line overlay.

The curve of the line will vary, depending on the source data I am pulling into the web page, so I can't do an exact image map for the curve as a test. Really, all I care about is that there is a curve there, within a static defined rectangular region on the web page.

Is it possible for me to manually clean up a copy of this region with no line inside it, and do a test where, if it looks like this manually edited blank image, the test fails?

[Marsha_R]

What happened when you tried it?

[DSmachineWorld]

I don't know how to do it...

[tristaanogre]

You're going to want to use the "Mask" feature of image comparison.  You're going to have a baseline object with a blank screen.  You're going to apply the mask.  If the result of the Compare method returns "false", then you have a curve in the region.  If it returns true, then the regions match meaning it's blank.

See https://support.smartbear.com/testcomplete/docs/reference/program-objects/picture/compare.html

[DSmachineWorld]

So can I add an edited picture with no curve to my project, and build the mask off that?

[tristaanogre · Accepted solution]

The picture without the curve is your "baseline".  The "mask" file is as separate image consisting only of white and black spaces, the white space being what you want to compare, the black being what you want to have ignored.

[DSmachineWorld]

OK. I'll go search the help files and raise a ticket with support if necessary after I've played around with this. Thanks all.