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Practical Programming in Tcl & Tk, Third Edition by Brent B. Welch

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Proposed Tk Changes

The Img Patch

The Img patch adds an alpha channel, better transparency support, and improved GIF support, including the ability to save GIF images. This patch also supports other image types (e.g., JPEG) that can be loaded as extensions.

Canvas Improvements

The canvas implementation needs to be converted to use Tcl_Obj values, which will improve its performance. Advanced tag searching may be added. This adds the ability to search for canvas items based on boolean expressions of tag values. Dashed lines will be added, even though we can support only single-pixel wide dashed lines on Windows 95. Windows NT, UNIX, and Macintosh can support thick dashed lines. Canvas coordinates may be specified as a single list argument instead ...

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