By Jon Jacobs
A complete identify distinctive at skilled 32-bit Delphi programmers and builders within the use of the photos normal library, OpenGL, which has develop into a typical for programming within the animation and machine online game industries.
Read or Download Delphi Developer's Guide to OpenGL (first 5 chapters only) PDF
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Extra resources for Delphi Developer's Guide to OpenGL (first 5 chapters only)
An OpenGL type that maps to Delphi cardinal. An OpenGL type that maps to Delphi single. An OpenGL command that forces drawing to the screen. An OpenGL type that maps to Delphi integer. An OpenGL command that specifies the width, in pixels, of all subsequent lines drawn. glOrtho An OpenGL command that specifies an orthographic projection and clipping volume. glRect An OpenGL command for drawing a rectangle. GLsizei An OpenGL type that maps to Delphi integer. glVertex An OpenGL command for specifying the coordinates of a vertex.
The command then causes the scene to rotate about the axis. Or it causes the coordinate system of the scene, and therefor the viewing angle of the observer, to rotate about the axis. Take your choice; it is relative! What really happens is that OpenGL creates a rotation matrix from the parameters and multiplies it with the active matrix, in this case, the ModelView matrix. PARAMETERS This simple program certainly does not need double precision to accomplish its purpose, so the float version is the proper choice for the command.
Pas. Empty all the menu item event handlers by deleting the lines of code within and save again so Delphi can remove the newly empty event handlers. In the Menu Designer delete the existing menu items and put in &Parameters, &Transformation, &Identity, and &Cull Disable. Create and fill in their event handlers as in Listing 3-4. Listing 3-4. Menu Item Event Handlers. Cull1Click(Sender: TObject); begin glDisable(GL_CULL_FACE); Invalidate; end; Create a new form and name it FormTransform, then save the unit as Trans1.