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upstream/clipper-6.4.2/cpp/cpp_cairo/cairo_clipper.hpp

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+/*******************************************************************************
+*                                                                              *
+* Author    :  Angus Johnson                                                   *
+* Version   :  1.1                                                             *
+* Date      :  4 April 2011                                                    *
+* Copyright :  Angus Johnson 2010-2011                                         *
+*                                                                              *
+* License:                                                                     *
+* Use, modification & distribution is subject to Boost Software License Ver 1. *
+* http://www.boost.org/LICENSE_1_0.txt                                         *
+*                                                                              *
+* Modified by Mike Owens to support coordinate transformation                  *
+*******************************************************************************/
+
+#ifndef CLIPPER_CAIRO_CLIPPER_HPP
+#define CLIPPER_CAIRO_CLIPPER_HPP
+
+#include "clipper.hpp"
+
+typedef struct _cairo cairo_t;
+
+namespace ClipperLib {
+  namespace cairo {
+
+    enum Transform {
+      tNone,
+      tUserToDevice,
+      tDeviceToUser
+    };
+
+//nb: Since Clipper only accepts integer coordinates, fractional values have to
+//be scaled up and down when being passed to and from Clipper. This is easily
+//accomplished by setting the scaling factor (10^x) in the following functions.
+//When scaling, remember that on most platforms, integer is only a 32bit value.
+    void cairo_to_clipper(cairo_t* cr,
+                          ClipperLib::Paths &pg,
+                          int scaling_factor = 0,
+                          Transform transform = tNone);
+
+    void clipper_to_cairo(const ClipperLib::Paths &pg,
+                          cairo_t* cr,
+                          int scaling_factor = 0,
+                          Transform transform = tNone);
+  }
+
+  class clipperCairoException : public std::exception
+  {
+    public:
+      clipperCairoException(const char* description)
+        throw(): std::exception(), m_description (description) {}
+      virtual ~clipperCairoException() throw() {}
+      virtual const char* what() const throw() {return m_description.c_str();}
+    private:
+      std::string m_description;
+  };
+}
+
+#endif
+