diff options
Diffstat (limited to 'upstream/clipper-6.4.2/cpp/cpp_cairo/main.cpp')
| -rw-r--r-- | upstream/clipper-6.4.2/cpp/cpp_cairo/main.cpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/upstream/clipper-6.4.2/cpp/cpp_cairo/main.cpp b/upstream/clipper-6.4.2/cpp/cpp_cairo/main.cpp new file mode 100644 index 0000000..b196a22 --- /dev/null +++ b/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);
+ }
+}
+//---------------------------------------------------------------------------
+
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