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Updated documentation in relation to GLUT_ALLOW_NEGATIVE_WINDOW_POSITION.

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(cherry picked from commit 9fa5db9841)

(cherry picked from commit 9fa5db9841)

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1777 7f0cb862-5218-0410-a997-914c9d46530a
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dcnieho 2015-12-14 16:22:31 +00:00
parent d8e364d053
commit 5a86d86eef
1 changed files with 55 additions and 3 deletions
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freeglut/web-src/docs/api.php
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@ -457,7 +457,13 @@ With <tt>glutGet</tt> information can be acquired about the current
window's size, position and decorations. Note however that according to
<a href="#Conventions">FreeGLUT's conventions</a>, the information
returned about the window coordinates does not correspond to the
coordinates used when setting window position.
coordinates used when setting window position. In addition, GLUT only
accepts positive window coordinates, and ignores all negative window
coordinates. But if GLUT_ALLOW_NEGATIVE_WINDOW_POSITION is enabled,
then negative window coordinates can be used. This is useful for
multi-montitor setups where the second monitor may be in the negative
desktop space of the primary monitor, as now the window can be placed
on the additional monitors.
</p>
<p>
@ -479,6 +485,11 @@ the window will immediately snap out to this width, but the application can
call <tt>glutReshapeWindow</tt> and make a window narrower again.
</p>
<p>
If GLUT_ALLOW_NEGATIVE_WINDOW_POSITION is enabled, <tt>glutInitWindowPosition</tt>
will accept negative window coordinates.
</p>
<h2>4.3 glutInitDisplayMode</h2>
<h2>4.4 glutInitDisplayString</h2>
@ -634,9 +645,9 @@ will exit.
<p>
If the application has two nested calls to <tt>glutMainLoop</tt> and calls
<tt>glutLeaveMainLoop</tt>, the behaviour
of <i>freeglut</i> is undefined. It may leave only the inner nested
of <i>FreeGLUT</i> is undefined. It may leave only the inner nested
loop or it may leave both loops. If the reader has a strong preference
for one behaviour over the other he should contact the <i>freeglut</i> Programming
for one behaviour over the other he should contact the <i>FreeGLUT</i> Programming
Consortium and ask for the code to be fixed.
</p>
@ -650,6 +661,44 @@ Consortium and ask for the code to be fixed.
<h2>6.2 glutCreateSubwindow</h2>
<p>
The <tt>glutCreateSubwindow</tt> function creates a subwindow of an existing window.
</p>
<p><b>Usage</b></p>
<p>
<tt>int glutCreateSubwindow(int window, int x, int y, int width, int height);</tt>
</p>
<p><b>Description</b></p>
<p>
Creates a subwindow of <i>window</i> that is at location <i>x</i> and <i>y</i>
relative to the window's upper-left corner, and is of the specified <i>width</i> and <i>height</i>. The newly created
window ID is returned by <tt>glutCreateSubwindow</tt>. By default, the position coordinates will only allow windows within the bounds of the parent.
Negative coordinates be treated as coordinates from the opposite edge for a given axis. In addition, the width of the window will be taken into account.
For example, if the parent window is 100 pixels wide, and the <i>x</i> is 10, and <i>width</i> is 20, the subwindow will be located at <tt>x = 10</tt>.
If <i>x</i> is -10, then the subwindow will be located at 70 <tt>(parent - abs(pos) - dim)</tt>. If the <i>width</i> or <i>height</i> are negative, then the dimension is taken as a
subtraction of the parent dimension. For example, if the parent window is 100 pixels wide, and the <i>x</i> is 10, and <i>width</i> is 20, the
subwindow will have a size of 20. If <i>width</i> is -20, then the subwindow will have a width of 70 <tt>(parent - pos - abs(dim))</tt>.
</p>
<p>
If GLUT_ALLOW_NEGATIVE_WINDOW_POSITION is enabled, the window behavior differs. Negative window coordinates are now accepted and may result in windows outside
of the viewing area, depending on the platform of operation. Negative <i>width</i> and <i>height</i> are still used as a subtraction of the parent window dimension,
but they do not take <i>x</i> or <i>y</i> into account. For example, if the parent window is 100 pixels wide, and the <i>x</i> is 10, and <i>width</i> is 20, the
subwindow will be located at <tt>x = 10</tt>. If <i>x</i> is -10, then the subwindow will be located at <tt>x = -10</tt>. If the parent window is 100 pixels wide,
and the <i>x</i> is 10, and <i>width</i> is 20, the subwindow will have a size of 20. If <i>width</i> is -20, then the subwindow will have a width of 80 <tt>(parent - abs(dim))</tt>.
</p>
<p><b>Changes From GLUT</b></p>
<p>
GLUT does not support negative <i>x</i> or <i>y</i>. Nor does it have GLUT_ALLOW_NEGATIVE_WINDOW_POSITION
which changes the the functionality of <tt>glutCreateSubwindow</tt>.
</p>
<h2>6.3 glutDestroyWindow</h2>
<h2>6.4 glutSetWindow, glutGetWindow</h2>
@ -1528,6 +1577,8 @@ href="#GeometricObject"><i>FreeGLUT</i>'s geometric object rendering
functions</a> also visualize the object's normals or not.</li>
<li>GLUT_STROKE_FONT_DRAW_JOIN_DOTS - Set whether join dots are drawn
between line segments when drawing letters of stroke fonts or not.</li>
<li>GLUT_ALLOW_NEGATIVE_WINDOW_POSITION - Set if negative positions can be
used for window coordinates.</li>
</ul>
</p>
@ -1606,6 +1657,7 @@ glutInitDisplayMode or glutSetOption(GLUT_INIT_DISPLAY_MODE, value)</li>
<li>GLUT_VERSION - Return value will be X*10000+Y*100+Z where X is the
major version, Y is the minor version and Z is the patch level.
This query is only supported in <i>freeglut</i> (version 2.0.0 or later).</li>
<li>GLUT_ALLOW_NEGATIVE_WINDOW_POSITION - 1 if negative window positions are enabled, 0 otherwise</li>
</ul>
<h2>13.3 glutDeviceGet</h2>