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scissorEffect.I
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file scissorEffect.I
10 * @author drose
11 * @date 2008-07-30
12 */
13
14/**
15 * Returns true if the ScissorEffect is a screen-based effect, meaning
16 * get_frame() has a meaningful value, but get_a() and get_b() do not.
17 */
18INLINE bool ScissorEffect::
19 is_screen() const {
20 return _screen;
21}
22
23/**
24 * If is_screen() returns true, this method may be called to query the screen-
25 * based scissor frame. This is a series of left, right, bottom, top,
26 * representing the scissor frame relative to the current DisplayRegion. See
27 * ScissorAttrib.
28 */
29INLINE const LVecBase4 &ScissorEffect::
30 get_frame() const {
31 return _frame;
32}
33
34/**
35 * Returns the number of node-based scissor points. See get_point().
36 */
37INLINE int ScissorEffect::
38 get_num_points() const {
39 return (int)_points.size();
40}
41
42/**
43 * If is_screen() returns false, then get_num_points() and get_point() may be
44 * called to query the node-based scissor frame. These return n points (at
45 * least two), which are understood to be in the space of this node, and which
46 * define any opposite corners of the scissor frame.
47 */
48INLINE const LPoint3 &ScissorEffect::
49 get_point(int n) const {
50 nassertr(n >= 0 && n < (int)_points.size(), LPoint3::zero());
51 return _points[n]._p;
52}
53
54/**
55 * Returns the node to which the nth point is relative, or empty NodePath to
56 * indicate the current node.
57 */
58INLINE NodePath ScissorEffect::
59 get_node(int n) const {
60 nassertr(n >= 0 && n < (int)_points.size(), NodePath());
61 return _points[n]._node;
62}
63
64/**
65 * Returns true if this ScissorEffect actually enables scissoring, or false if
66 * it culls only.
67 */
68INLINE bool ScissorEffect::
69 get_clip() const {
70 return _clip;
71}
NodePath
NodePath is the fundamental system for disambiguating instances, and also provides a higher-level int...
Definition nodePath.h:159
ScissorEffect::get_node
get_node
Returns the node to which the nth point is relative, or empty NodePath to indicate the current node.
Definition scissorEffect.h:57
ScissorEffect::get_frame
const LVecBase4 & get_frame() const
If is_screen() returns true, this method may be called to query the screen- based scissor frame.
Definition scissorEffect.I:30
ScissorEffect::is_screen
bool is_screen() const
Returns true if the ScissorEffect is a screen-based effect, meaning get_frame() has a meaningful valu...
Definition scissorEffect.I:19
ScissorEffect::get_point
get_point
If is_screen() returns false, then get_num_points() and get_point() may be called to query the node-b...
Definition scissorEffect.h:55
ScissorEffect::get_clip
bool get_clip() const
Returns true if this ScissorEffect actually enables scissoring, or false if it culls only.
Definition scissorEffect.I:69
ScissorEffect::get_num_points
get_num_points
Returns the number of node-based scissor points.
Definition scissorEffect.h:55