Initial commit

upstream/clipper-6.4.2/cpp/cpp_cairo/main.cpp

@@ -0,0 +1,182 @@
+//---------------------------------------------------------------------------
+
+#include <windows.h>
+#include <cstring>
+#include <cmath>
+#include <sstream>
+#pragma hdrstop
+
+#include "clipper.hpp"
+#include "cairo.h"
+#include "cairo-win32.h"
+#include "cairo_clipper.hpp"
+//---------------------------------------------------------------------------
+
+int offsetVal;
+
+LRESULT CALLBACK WndProcedure(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
+
+int CALLBACK wWinMain(HINSTANCE hInstance,
+  HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
+{
+  WCHAR* ClsName = L"CairoApp";
+  WCHAR* WndName = L"A Simple Cairo Clipper Demo";
+  offsetVal = 0;
+
+  MSG        Msg;
+  HWND       hWnd;
+  WNDCLASSEX WndClsEx;
+
+  // Create the application window
+  WndClsEx.cbSize        = sizeof(WNDCLASSEX);
+  WndClsEx.style         = CS_HREDRAW | CS_VREDRAW;
+  WndClsEx.lpfnWndProc   = WndProcedure;
+  WndClsEx.cbClsExtra    = 0;
+  WndClsEx.cbWndExtra    = 0;
+  WndClsEx.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
+  WndClsEx.hCursor       = LoadCursor(NULL, IDC_ARROW);
+  WndClsEx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
+  WndClsEx.lpszMenuName  = NULL;
+  WndClsEx.lpszClassName = ClsName;
+  WndClsEx.hInstance     = hInstance;
+  WndClsEx.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);
+
+  // Register the application
+  RegisterClassEx(&WndClsEx);
+
+  // Create the window object
+  hWnd = CreateWindow(ClsName, WndName, WS_OVERLAPPEDWINDOW,
+    CW_USEDEFAULT, CW_USEDEFAULT, 400, 300,
+    NULL, NULL, hInstance, NULL);
+  if( !hWnd ) return 0;
+
+  ShowWindow(hWnd, SW_SHOWNORMAL);
+  UpdateWindow(hWnd);
+
+  while( GetMessage(&Msg, NULL, 0, 0) )
+  {
+     TranslateMessage(&Msg);
+     DispatchMessage(&Msg);
+  }
+  return Msg.wParam;
+}
+//------------------------------------------------------------------------------
+
+
+void OnPaint(HWND hWnd, HDC dc)
+{
+  RECT rec;
+  GetClientRect(hWnd, &rec);
+  cairo_surface_t* surface = cairo_win32_surface_create(dc);
+  cairo_t* cr = cairo_create(surface);
+
+  cairo_set_fill_rule(cr, CAIRO_FILL_RULE_WINDING);
+  cairo_set_line_width (cr, 2.0);
+
+  //fill background with white ...
+  cairo_rectangle(cr, 0, 0, rec.right, rec.bottom);
+  cairo_set_source_rgba(cr, 1, 1, 1, 1);
+  cairo_fill(cr);
+
+  using namespace ClipperLib;
+
+  const int scaling = 2;
+
+  Clipper clpr;    //clipper class
+  Paths pg; //std::vector for polygon(s) storage
+
+  //create a circular pattern, add the path to clipper and then draw it ...
+  cairo_arc(cr, 170,110,70,0,2*3.1415926);
+  cairo_close_path(cr);
+  cairo::cairo_to_clipper(cr, pg, scaling);
+  clpr.AddPaths(pg, ptSubject, true);
+  cairo_set_source_rgba(cr, 0, 0, 1, 0.25);
+  cairo_fill_preserve (cr);
+  cairo_set_source_rgba(cr, 0, 0, 0, 0.5);
+  cairo_stroke (cr);
+
+  //draw a star and another circle, add them to clipper and draw ...
+  cairo_move_to(cr, 60,110);
+  cairo_line_to (cr, 240,70);
+  cairo_line_to (cr, 110,210);
+  cairo_line_to (cr, 140,25);
+  cairo_line_to (cr, 230,200);
+  cairo_close_path(cr);
+  cairo_new_sub_path(cr);
+  cairo_arc(cr, 190,50,20,0,2*3.1415926);
+  cairo_close_path(cr);
+  cairo::cairo_to_clipper(cr, pg, scaling);
+  clpr.AddPaths(pg, ptClip, true);
+  cairo_set_source_rgba(cr, 1, 0, 0, 0.25);
+  cairo_fill_preserve (cr);
+  cairo_set_source_rgba(cr, 0, 0, 0, 0.5);
+  cairo_stroke (cr);
+
+  clpr.Execute(ctIntersection, pg, pftNonZero, pftNonZero);
+  //now do something fancy with the returned polygons ...
+  OffsetPaths(pg, pg, offsetVal * std::pow((double)10,scaling), jtMiter, etClosed);
+
+  //finally copy the clipped path back to the cairo context and draw it ...
+  cairo::clipper_to_cairo(pg, cr, scaling);
+  cairo_set_source_rgba(cr, 1, 1, 0, 1);
+  cairo_fill_preserve (cr);
+  cairo_set_source_rgba(cr, 0, 0, 0, 1);
+  cairo_stroke (cr);
+
+  cairo_text_extents_t extent;
+  cairo_set_font_size(cr,11);
+  std::stringstream ss;
+  ss << "Polygon offset = " << offsetVal << ".  (Adjust with arrow keys)";
+  std::string s = ss.str();
+  cairo_text_extents(cr, s.c_str(), &extent);
+  cairo_move_to(cr, 10, rec.bottom - extent.height);
+  cairo_show_text(cr, s.c_str());
+
+  cairo_destroy (cr);
+  cairo_surface_destroy (surface);
+}
+//------------------------------------------------------------------------------
+
+LRESULT CALLBACK WndProcedure(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
+{
+    PAINTSTRUCT ps;
+    HDC Handle;
+
+    switch(Msg)
+    {
+      case WM_DESTROY:
+        PostQuitMessage(WM_QUIT);
+        return 0;
+
+      case WM_PAINT:
+        Handle = BeginPaint(hWnd, &ps);
+        OnPaint(hWnd, Handle);
+        EndPaint(hWnd, &ps);
+        return 0;
+
+      case WM_KEYDOWN:
+        switch(wParam)
+        {
+          case VK_ESCAPE:
+            PostQuitMessage(0);
+            return 0;
+          case VK_RIGHT:
+          case VK_UP:
+            if (offsetVal < 20) offsetVal++;
+            InvalidateRect(hWnd, 0, false);
+            return 0;
+          case VK_LEFT:
+          case VK_DOWN:
+            if (offsetVal > -20) offsetVal--;
+            InvalidateRect(hWnd, 0, false);
+            return 0;
+          default:
+            return DefWindowProc(hWnd, Msg, wParam, lParam);
+        }
+
+      default:
+        return DefWindowProc(hWnd, Msg, wParam, lParam);
+    }
+}
+//---------------------------------------------------------------------------
+