Shear - Win32 Programmer's Reference

Custom Search

Shear

Some applications provide features that shear objects drawn in the client area. If your application features shear capabilities, use the SetWorldTransform function to set appropriate values in the world-space to page-space transformation. This function receives a pointer to an XFORM structure containing the appropriate values. The eM12 and eM21 members of XFORM specify the horizontal and vertical proportionality constants, respectively.

There are two components of the shear transformation. The first alters the vertical lines in an object; the second alters the horizontal lines. The following illustration shows a 20- by 20-unit rectangle sheared horizontally when copied from world space to page space.

A horizontal shear can be represented by the following algorithm:

x' = x + (Sx * y)

where x is the original x-coordinate, Sx is the proportionality constant, and x' is the result of the shear transformation.

A vertical shear can be represented by the following algorithm:

y' = y + (Sy * x)

where y is the original y-coordinate, Sy is the proportionality constant, and y' is the result of the shear transformation.

The horizontal-shear and vertical-shear transformations can be combined into a single operation using a 2-by-2 matrix.

|x' y'| == |x y| * | 1 Sx|

| Sy 1|

The 2-by-2 matrix that produced the shear contains the following values.

|1 1|

|0 1|

Last news from Greatis Software

    Nostalgia .Net     .Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More »

Recommended software for developers

    Ultimate Pack     Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More »

    Form Designer .Net     Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More »

    Print Suite .Net     Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More »

    Gradient Controls .Net     Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More »

    Greatis iGrid     iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More »

All the contacts and projects

Dmitry Vasiliev (just.dmitry)

More Online Helps

Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages

greatis just4fun network