DWinProgramming /Samples/Extra/Cartesian/Cartesian.d

Language D Lines 191
MD5 Hash 21b6cf20b88cb03595c1d68806c61cb4
Repository git://github.com/AndrejMitrovic/DWinProgramming.git View Raw File View Project SPDX
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/+
 +           Copyright Andrej Mitrovic 2011.
 +  Distributed under the Boost Software License, Version 1.0.
 +     (See accompanying file LICENSE_1_0.txt or copy at
 +           http://www.boost.org/LICENSE_1_0.txt)
 +
 + Demonstrates using Cartesian coordinates which has 
 + the Y axis positive values towards the top compared to GDI.
 + 
 + More info found here: 
 + http://www.functionx.com/visualc/gdi/gdicoord.htm
 +/

module Cartesian;

import core.memory;
import core.runtime;
import core.thread;
import std.conv;
import std.math;
import std.range;
import std.string;
import std.utf;

auto toUTF16z(S)(S s)
{
    return toUTFz!(const(wchar)*)(s);
}

pragma(lib, "gdi32.lib");

import win32.windef;
import win32.winuser;
import win32.wingdi;
import win32.winbase;

string appName     = "Cartesian";
string description = "Cartesian Demo";
HINSTANCE hinst;

extern (Windows)
int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow)
{
    int result;
    void exceptionHandler(Throwable e) { throw e; }

    try
    {
        Runtime.initialize(&exceptionHandler);
        result = myWinMain(hInstance, hPrevInstance, lpCmdLine, iCmdShow);
        Runtime.terminate(&exceptionHandler);
    }
    catch (Throwable o)
    {
        MessageBox(null, o.toString().toUTF16z, "Error", MB_OK | MB_ICONEXCLAMATION);
        result = 0;
    }

    return result;
}

int myWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow)
{
    hinst = hInstance;
    HACCEL hAccel;
    HWND hwnd;
    MSG  msg;
    WNDCLASS wndclass;

    wndclass.style         = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc   = &WndProc;
    wndclass.cbClsExtra    = 0;
    wndclass.cbWndExtra    = 0;
    wndclass.hInstance     = hInstance;
    wndclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
    
    //~ wndclass.hbrBackground = cast(HBRUSH) GetStockObject(WHITE_BRUSH);
    wndclass.hbrBackground = null;  // don't send WM_ERASEBKND messages
    
    wndclass.lpszMenuName  = appName.toUTF16z;
    wndclass.lpszClassName = appName.toUTF16z;

    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL, "This program requires Windows NT!", appName.toUTF16z, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(appName.toUTF16z,              // window class name
                        description.toUTF16z,          // window caption
                        WS_OVERLAPPEDWINDOW,           // window style
                        CW_USEDEFAULT,                 // initial x position
                        CW_USEDEFAULT,                 // initial y position
                        CW_USEDEFAULT,                 // initial x size
                        CW_USEDEFAULT,                 // initial y size
                        NULL,                          // parent window handle
                        NULL,                          // window menu handle
                        hInstance,                     // program instance handle
                        NULL);                         // creation parameters

    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

extern (Windows)
LRESULT WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static int cxClient, cyClient, cxSource, cySource;
    int x, y;
    HDC hdc;
    PAINTSTRUCT ps;

    static HDC     hdcMem;
    static HBITMAP hbmMem;
    static HANDLE  hOld;
    RECT rect;
    
    switch (message)
    {
        case WM_SIZE:
            cxClient = LOWORD(lParam);
            cyClient = HIWORD(lParam);
            return 0;

        // When you set 'hbrBackground = null' it prevents
        // the WM_ERASEBKND message to be sent.
        case WM_ERASEBKGND:
            return 1;
        
        case WM_PAINT:
        {
            // Get DC for window
            hdc = BeginPaint(hwnd, &ps);
            
            // Create an off-screen DC for double-buffering
            hdcMem = CreateCompatibleDC(hdc);
            hbmMem = CreateCompatibleBitmap(hdc, cxClient, cyClient);
            hOld = SelectObject(hdcMem, hbmMem);
        
            // Draw into hdcMem
            GetClientRect(hwnd, &rect);
            
            // Flip Y axis
            SetMapMode(hdcMem, MM_ANISOTROPIC);
            SetViewportOrgEx(hdcMem, 0, rect.bottom, null);
            SetWindowExtEx(hdcMem, rect.bottom, rect.right, null);
            SetViewportExtEx(hdcMem, rect.bottom, -rect.right, null);
            
            // Required for both contexts
            SetMapMode(hdc, MM_ANISOTROPIC);
            SetViewportOrgEx(hdc, 0, rect.bottom, null);
            SetWindowExtEx(hdc, rect.bottom, rect.right, null);
            SetViewportExtEx(hdc, rect.bottom, -rect.right, null);
            
            FillRect(hdcMem, &rect, GetStockObject(BLACK_BRUSH));

            SelectObject(hdcMem, GetStockObject(WHITE_PEN));
            MoveToEx(hdcMem, 50, 50, null);
            LineTo(hdcMem, 150, 100);  // should result in a '/' line pointing toward top-right

            // Transfer the off-screen DC to the screen
            BitBlt(hdc, 0, 0, cxClient, cyClient, hdcMem, 0, 0, SRCCOPY);

            // Free-up the off-screen DC
            SelectObject(hdcMem, hOld);
            DeleteObject(hbmMem);
            DeleteDC (hdcMem);

            EndPaint(hwnd, &ps);
            return 0;
        }
        
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;

        default:
    }

    return DefWindowProc(hwnd, message, wParam, lParam);
}
Back to Top