【计算机图形学】1-1-5 基本绘制条件

最新推荐文章于 2024-06-30 01:01:57 发布

最新推荐文章于 2024-06-30 01:01:57 发布 · 98 阅读

本文介绍了如何在窗口中实现鼠标事件监听与像素点绘制功能，满足基本的学习需求。详细阐述了GUI窗口的重绘、像素设置与获取过程，并通过事件处理函数实现了鼠标移动、点击等操作。

添加上鼠标事件的监控和像素点的绘制后，就满足了基本的学习条件。

文件：define.h

typedef uint16 z_color;


static const int32 MOUSE_LEFT   = 0;
static const int32 MOUSE_MIDDLE  = 1;
static const int32 MOUSE_RIGHT  = 2;
static const int32 MOUSE_DOWN   = 3;
static const int32 MOUSE_UP    = 4;



文件：gui_windows.h

void gui_repaint(void); void gui_setPixel(int x, int y, int r, int g, int b); z_color gui_getPixel(int x, int y);

文件：gui_windows.c

void gui_repaint(void)
{
    InvalidateRect(handleMainWindow, NULL, TRUE);
    UpdateWindow(handleMainWindow);
}

void gui_setPixel(int x, int y, int r, int g, int b)
{
    COLORREF color = RGB(r, g, b);
    SetPixel(handleMainWindowDeviceContext, x, y, color);
}

z_color gui_getPixel(int x, int y)
{
    return GetPixel(handleMainWindowDeviceContext, x, y);
}

LRESULT CALLBACK gui_mainProcess(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT ps;
    RECT rect;
    switch (message)
    {
    case WM_PAINT:
        handleMainWindowDeviceContext = BeginPaint(hwnd, &ps);
        GetClientRect(hwnd, &rect);
        if(mainWindowDisplayFunction)
        {
            mainWindowDisplayFunction();
        }
        EndPaint(hwnd, &ps) ;
        break;
    case WM_MOUSEMOVE:
        if(mainWindowMotionFunction)
        {
            mainWindowMotionFunction(LOWORD(lParam), HIWORD(lParam));
        }
        break;
    case WM_LBUTTONDOWN:
        if(mainWindowMouseFunction)
        {
            mainWindowMouseFunction(MOUSE_LEFT, MOUSE_DOWN, LOWORD(lParam), HIWORD(lParam));
        }
        break;
    case WM_LBUTTONUP:
        if(mainWindowMouseFunction)
        {
            mainWindowMouseFunction(MOUSE_LEFT, MOUSE_UP, LOWORD(lParam), HIWORD(lParam));
        }
        break;
    case WM_RBUTTONDOWN:
        if(mainWindowMouseFunction)
        {
            mainWindowMouseFunction(MOUSE_RIGHT, MOUSE_DOWN, LOWORD(lParam), HIWORD(lParam));
        }
        break;
    case WM_RBUTTONUP:
        if(mainWindowMouseFunction)
        {
            mainWindowMouseFunction(MOUSE_RIGHT, MOUSE_UP, LOWORD(lParam), HIWORD(lParam));
        }
        break;
    case WM_MBUTTONDOWN:
        if(mainWindowMouseFunction)
        {
            mainWindowMouseFunction(MOUSE_MIDDLE, MOUSE_DOWN, LOWORD(lParam), HIWORD(lParam));
        }
        break;
    case WM_MBUTTONUP:
        if(mainWindowMouseFunction)
        {
            mainWindowMouseFunction(MOUSE_MIDDLE, MOUSE_UP, LOWORD(lParam), HIWORD(lParam));
        }
        break;
    case WM_KEYDOWN:
        break;
    case WM_KEYUP:
        break;
    case WM_MOUSEWHEEL:
        break;
    case WM_DESTROY:
        PostQuitMessage(0) ;
        break;
    }
    return DefWindowProc (hwnd, message, wParam, lParam) ;
}