87 lines
2.9 KiB
C++
87 lines
2.9 KiB
C++
/* This file is part of the Pangolin Project.
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* http://github.com/stevenlovegrove/Pangolin
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*
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* Copyright (c) 2013 Steven Lovegrove
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <iostream>
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#include <string>
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#include <cmath>
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namespace pangolin
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{
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/// Units for measuring screen distances.
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enum Unit {
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Fraction,
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Pixel,
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ReversePixel
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};
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/// Defines absolute or relative position from parent viewport edge.
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/// Constructors distinguised by whole pixels, or floating
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/// fraction in interval [0,1]
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struct PANGOLIN_EXPORT Attach {
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/// Attach to Left/Bottom edge
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Attach() : unit(Fraction), p(0) {}
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/// General constructor
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Attach(Unit unit, GLfloat p) : unit(unit), p(p) {}
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/// Specify relative position in range [0,1].
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/// 0 represents leftmost / bottom-most edge,
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/// 1 represents rightmost / topmost edge
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Attach(GLfloat p) : unit(Fraction), p(p) {
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// Allow for numerical imprecision when checking usage.
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if( p < -1E-3 || 1.001 < p ) {
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std::cerr << "Pangolin API Change: Display::SetBounds must be used with Attach::Pix or Attach::ReversePix to specify pixel bounds relative to an edge. See the code samples for details." << std::endl;
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throw std::exception();
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}
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}
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/// Specify absolute position from leftmost / bottom-most edge.
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static Attach Pix(int p) {
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return Attach(p >=0 ? Pixel : ReversePixel, std::abs((float)p));
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}
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/// Specify absolute position from rightmost / topmost edge.
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static Attach ReversePix(int p) {
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return Attach(ReversePixel, (GLfloat)p);
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}
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/// Specify relative position in range [0,1].
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/// 0 represents leftmost / bottom-most edge,
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/// 1 represents rightmost / topmost edge
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static Attach Frac(float frac) {
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return Attach(frac);
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}
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Unit unit;
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GLfloat p;
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};
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} // namespace pangolin
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