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Thirdparty/Pangolin/include/pangolin/display/attach.h

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