#WIN32 TRANSPARENT RECTANGLE UPDATE#
#WIN32 TRANSPARENT RECTANGLE SERIES#
#WIN32 TRANSPARENT RECTANGLE WINDOWS#

It is possible to replace one of the current source regions with one of the sub-view results simply by dragging the region to the window where the source regions are displayed. As each source region is modified, these sub-views are updated. On the right-hand side of the window where the regions are drawn, there are four sub-views, where the different combine modes: RGN_AND, RGN_DIFF, RGN_OR, RGN_XOR are all demonstrated. The Source 1 region will be drawn in RED, the Source 2 region will be drawn in Blue.

#WIN32 TRANSPARENT RECTANGLE UPDATE#

Let go of the mouse button to update the region with the new shape that you have created.At any time, you can hit the Escape key to cancel the drawing operation.Use the Right mouse button to draw a shape for the Source 2 region. Use the Left mouse button to draw a shape for the Source 1 region.A rubber-banding effect will show where the region will appear. Select an area on the main window, and start dragging the region.There are three choices, Rectangle, Ellipse, or Round Rectangle. Select the desired draw mode shape from the menu or the tool bar.Here are the directions for creating a source region: The polygon has been left out simply because of extra work related to the UI that would be required to incorporate this tool, however, a polygon is completely possible. The user can add new portions to either one of the source regions with a rectangle, ellipse or round rectangle tool. The program that has been created to demonstrate some of the possibilities for regions is an interactive window that allows the user to create two regions. ExtCreateRegion fails if the transformation ( XFORM) matrix has a scaling or translation of the region.

#WIN32 TRANSPARENT RECTANGLE WINDOWS#

The Windows 9x kernel does not support world transforms that involve either shearing or rotations. Therefore, if you create one of these regions on a Windows 2000 machine, and store the RGN_DATA of a region in a file or send the data across the network to a Windows NT4 machine, when you try to call ExtCreateRgn on the structure, it will fail. If you try to create a region with data that contains overlapping rectangles on Windows NT4, this function will fail. Something to be aware of, is that Windows 2000 will accept a region that has overlapping rectangles. Shown below is an example of each of the boolean operations that can be performed in CombineRgn: ValueĬreates the intersection of the two combined regionsĬONST XFORM *lpXform, // transformation dataĬONST RGNDATA *lpRgnData // region data buffer This function has five operations that can be performed in order to combine two different regions. CombineRgnĪfter a few basic regions are created, it is possible to perform boolean operations on the regions in order to create more complex regions with CombineRgn. There are a few operations that can be performed on a region in order to query, modify test its data.

#WIN32 TRANSPARENT RECTANGLE SERIES#

As with drawing ellipses, elliptic regions are very large, and may slow your program down if you use a large number of them.Ĭreates a region consisting of a series of polygons.Ĭreates a rectangular region from a RECT structure.Ĭreates a rectangular region with rounded corners.Ĭreates a region from the specified region and transformation data.Ĭreates a region from a WIN32 Path created in a DC. As with drawing ellipses, elliptic regions are very large, and may slow your program down if you use a large number of them.Ĭreates an elliptical region from a RECT structure. Listed below is a table that describes each of the creation functions. There are a number of functions that can be used to create a region, from a simple shape such as a rectangle or an ellipse, to a complicated shape such as the outline of a string of text.

There are a number of ways to create a region. A few diagrams may accompany the explanation as well. However, some of the functions are a little more difficult to understand and master, therefore extra details have been added to explain these functions. Many of the functions that relate to regions are very simple, and need very little explanation, in fact, the definition from MSDN is adequate enough to explain these functions.

Define window shape, Irregular Shaped Windows.

Some of the useful places for a region are: However, there are many functions in the WIN32 GDI that require a region. They are device independent, which means that a device context (DC) is not needed to create or use one. This will draw on windows device context.Regions are a resource in windows that are very useful.

Win32 transparent rectangle