C++的GDI+编程

tamashii · 发表于 2010-6-10 01:55:06

#include <stdio.h>
#include <windows.h>
#include <gdiplus.h>
using namespace Gdiplus;
HWND g_hWnd;
Graphics * graphics;
Bitmap * bitmap;
Graphics * g_pGraphics;
HDC hDC;
GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR GdiToken;
char title[255];
int screenwidth = 640;
int screenheight = 480;
int x = 0, y = 0, a = 0;
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
void Render();
void OnMouseMove(WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
WNDCLASS wndclass;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hbrBackground = (HBRUSH)(COLOR_3DFACE + 1);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hInstance = hInstance;
wndclass.lpfnWndProc = WndProc;
wndclass.lpszClassName = "DLMEngine";
wndclass.lpszMenuName = NULL;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndclass);
int x, y, width, height;
GetPrivateProfileString("Engine", "Title", "Untitled", title, 255, ".\\Config.ini");
width = GetSystemMetrics(SM_CXDLGFRAME) * 2 + screenwidth;
height = GetSystemMetrics(SM_CYDLGFRAME) * 2 + screenheight + GetSystemMetrics(SM_CYCAPTION);
x = (GetSystemMetrics(SM_CXSCREEN) - width) / 2;
y = (GetSystemMetrics(SM_CYSCREEN) - height) / 2;
g_hWnd = CreateWindow("DLMEngine", title, WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, x, y, width, height, NULL, NULL, hInstance, NULL);
GdiplusStartup(&GdiToken, &gdiplusStartupInput,NULL);
hDC = GetDC(g_hWnd);
g_pGraphics = new Graphics(hDC);
bitmap = new Bitmap(screenwidth, screenheight);
graphics = Graphics::FromImage(bitmap);
graphics->SetTextRenderingHint(TextRenderingHintAntiAlias);
ShowWindow(g_hWnd, SW_SHOWNORMAL);
MSG msg;
while(true) {
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT) {
break;
}
Render();
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
ReleaseDC(g_hWnd, hDC);
GdiplusShutdown(GdiToken);
return 0;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
switch(uMsg) {
case WM_PAINT :
Render();
return 0;
case WM_MOUSEMOVE :
OnMouseMove(wParam, lParam);
return 0;
case WM_DESTROY :
PostQuitMessage(0);
return 0;
default :
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
}
void Render() {
Font * font = new Font(L"SimHei", 18);
graphics->Clear(Color::Black);
graphics->DrawString(L"文字测试", 4, font, PointF(x, y), new SolidBrush(Color::White));
g_pGraphics->DrawImage(bitmap, 0, 0);
}
void OnMouseMove(WPARAM wParam, LPARAM lParam) {
x = LOWORD(lParam);
y = HIWORD(lParam);
a = wParam;
}

复制代码

需要用到库文件 gdipluse.lib

shawind · 发表于 2010-6-14 08:57:08

可惜，主程序的结构还是标准的win app结构，没有为游戏特别优化啊。

inffu · 发表于 2010-6-14 14:31:30

用来画一个主窗体吗？

tamashii · 发表于 2010-8-1 08:11:08

我先来说一下 GDI+ 的特点：
1.支持含有 Alpha 通道的32位图片（例如png）
2.全部面向对象的编程方式
3.支持双缓冲的画面（用一个Bitmap来做后台）
4.图片操作更加方便

shawind · 发表于 2010-8-1 11:08:21

是啊，很多绘图形的工具都用GDI+来作了。唯一的不足就是没有硬件加速，作大动态游戏还是有点缺陷。DX11里新加了个D2D，当然比GDI+快那是肯定的，不知道比起GDI+来是否方便。

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