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twips and pixels

Posted on 1999-01-14
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Last Modified: 2008-02-01
1. The help file said that twip is independent on the screen while pixel is dependent. I did a test: change the screen resolusion for the same application. For a full screen form width, both the twips and pixels were changed (both are dependet to scree?) although the rate of twips to pixel was remained to 15.
2. If we set a form's width = 9600 twips, in different computers it will remain 9600 twips and 640 pixels...I must misunderstood something!
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Question by:learn
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caraf_g earned 40 total points
ID: 1456315
Different screens have different values for Twips Per Pixel.

There are two values available in every VB program to find out what the actual Twips Per Pixel values are.

Screen.TwipsPerPixelX gives you the horizontal number of Twips Per Pixel
Screen.TwipsPerPixelY gives you the vertical one.

Depending on these values, the form will have different widths in pixels.

If your form is 1500 Twips wide, and your screen's TwipsPerPixelX value is 15, the form will be 100 pixels wide.

On another monitor, however, the TwipsPerPixelX value could be 12.

On that monitor, the same form with a width of 1500 twips will be 1500/12 = 125 pixels wide.
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by:learn
ID: 1456316
But why twip is screen independent?
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Expert Comment

by:vikiing
ID: 1456317
>But why twip is screen independent?

"Twip" stands for "Twentieth of one printer's point". There are approx. 1440 twips in a logical inch, or 567 twips in a logical centimeter; that's the length of a piece of screen measuring one inch or one centimeter when it is printed.

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Author Comment

by:learn
ID: 1456318
Hi vikiing

Do you mean in any computer and any printer, we always print out one point in the printer from 20 twips in the computer?
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