二维图形的使用【OO改良版】

为了简化编程，首先定义一些辅助宏和对一些类型进行重定义。

#define release_com(x)  { if(x) { x->Release(); x = NULL; } }
#define free_memory(x)  { free(x); (x) = NULL; }

#define STREQ(a, b) (*(a) == (*b) && strcmp((a), (b)) == 0)

#define err_msg_box(msg) MessageBox(NULL, msg, "Error", MB_OK)

typedef unsigned char   uchar;
typedef unsigned long   ulong;
typedef unsigned short  ushort;
typedef char*           char_ptr;
typedef char*           pstr;
typedef uchar*          uchar_ptr;
typedef long*           long_ptr;
typedef float*          float_ptr;
typedef const char*     pcstr;

TILE类的定义：

/*************************************************************************
PURPOSE:
    Interface for 2D tile.
*************************************************************************/

#ifndef _TILE_H_
#define _TILE_H_

#include "core_common.h"

//=========================================================================================
// This class encapsulate 2D graphics tile draw.
//=========================================================================================
typedef class TILE
{
public:
    TILE();
    ~TILE();

    // functions to create and free the tile interface
    BOOL create(long num_textures);
    void free();

    // functions to load and free a single texture

    BOOL load_texture(long texture_index, pcstr texture_filename,
                      short tile_width, short tile_height,
                      D3DCOLOR transparent, D3DFORMAT format);

    void free_texture(long texture_index);

    // functions to retrieve tile dimensions and number of tiles in a texture
    long get_tile_width(long texture_index);
    long get_tile_height(long texture_index);
    long get_tile_number(long texture_index);

    // draw a single tile at specified location
    BOOL draw_tile(long texture_index, long tile_index,
                   long screen_x, long screen_y,
                   D3DCOLOR color,
                   float x_scale, float y_scale);

private:
    long            m_num_textures;      // number of textures
    TEXTURE_PTR     m_textures;          // TEXTURE array

    long_ptr        m_tile_widths;       // tile width array
    long_ptr        m_tile_heights;      // tile height array
    long_ptr        m_tile_columns;      // number of tile columns in texture
} *TILE_PTR;

#endif

TILE类的实现：

/*************************************************************************
PURPOSE:
    Implements for 2D graphics tile.
*************************************************************************/

#include "core_common.h"
#include "core_graphics.h"
#include "tile.h"

//----------------------------------------------------------------------------------
// Constructor, zero member data.
//----------------------------------------------------------------------------------
TILE::TILE()
{
    memset(this, 0, sizeof(*this));
}

//----------------------------------------------------------------------------------
// Destructor, free allocated resource.
//----------------------------------------------------------------------------------
TILE::~TILE()
{
    free();
}

//----------------------------------------------------------------------------------
// Free allocated resource.
//----------------------------------------------------------------------------------
void TILE::free()
{
    // free all tetxures
    if(m_num_textures)
    {
        for(short i = 0; i < m_num_textures; i++)
            m_textures[i].free();
    }

    delete[] m_textures;
    m_textures = NULL;

    // free width, height, and column arrays.
    delete[] m_tile_widths;
    delete[] m_tile_heights;
    delete[] m_tile_columns;

    m_tile_widths = m_tile_heights = m_tile_columns = NULL;

    m_num_textures = 0;
}

//----------------------------------------------------------------------------------
// Allocate memory.
//----------------------------------------------------------------------------------
BOOL TILE::create(long num_textures)
{
    // free in case of existing data
    free();

    if((m_num_textures = num_textures) == 0)
        return FALSE;

    // allocate texture objects
    if((m_textures = new TEXTURE[m_num_textures]) == NULL)
        return FALSE;

    // allocate width, height, and column count arrays
    m_tile_widths  = new long[m_num_textures];
    m_tile_heights = new long[m_num_textures];
    m_tile_columns = new long[m_num_textures];

    return TRUE;
}

//----------------------------------------------------------------------------------
// Load texture from file.
//----------------------------------------------------------------------------------
BOOL TILE::load_texture(long texture_index, pcstr texture_filename,
                        short tile_width, short tile_height,
                        D3DCOLOR transparent, D3DFORMAT format)
{
    // error checking
    if(texture_index >= m_num_textures || m_textures == NULL || texture_filename == NULL)
        return FALSE;

    // free older texture resource
    free_texture(texture_index);

    // load the texture
    if(! m_textures[texture_index].load(texture_filename, transparent, format))
        return FALSE;

    // store width value (get width of texture if no tile_width was specified).
    if(tile_width == 0)
        m_tile_widths[texture_index] = m_textures[texture_index].get_width();
    else
        m_tile_widths[texture_index] = tile_width;

    // store height value (get height of texture if no tile_height was specified).
    if(tile_height == 0)
        m_tile_heights[texture_index] = m_textures[texture_index].get_height();
    else
        m_tile_heights[texture_index] = tile_height;

    // Calculate how many columns of tiles there are in the texture.
    // This is used to speed up calculations when drawing tiles.
    m_tile_columns[texture_index] = m_textures[texture_index].get_width() / m_tile_widths[texture_index];

    return TRUE;
}

//----------------------------------------------------------------------------------
// Free specified texture.
//----------------------------------------------------------------------------------
void TILE::free_texture(long texture_index)
{
    // error checking
    if(texture_index >= m_num_textures || m_textures == NULL)
        return;

    // free a single texture resource
    m_textures[texture_index].free();
}

//----------------------------------------------------------------------------------
// Return tile width.
//----------------------------------------------------------------------------------
long TILE::get_tile_width(long texture_index)
{
    // error checking
    if(texture_index >= m_num_textures || m_tile_widths == NULL)
        return 0;

    return m_tile_widths[texture_index];
}

//----------------------------------------------------------------------------------
// Return tile height.
//----------------------------------------------------------------------------------
long TILE::get_tile_height(long texture_index)
{
    // error checking
    if(texture_index >= m_num_textures || m_tile_widths == NULL)
        return 0;

    return m_tile_heights[texture_index];
}

//----------------------------------------------------------------------------------
// Return number of tiles.
//----------------------------------------------------------------------------------
long TILE::get_tile_number(long texture_index)
{
    // error checking
    if(texture_index >= m_num_textures || m_textures == NULL ||
       m_tile_columns == NULL || m_tile_widths == NULL || m_tile_heights == NULL)
    {
       return 0;
    }

    return m_tile_columns[texture_index] * (m_textures[texture_index].get_height() / m_tile_heights[texture_index]);
}

//----------------------------------------------------------------------------------
// Draw tile.
//----------------------------------------------------------------------------------
BOOL TILE::draw_tile(long texture_index, long tile_index,
                     long screen_x, long screen_y,
                     D3DCOLOR color,
                     float x_scale, float y_scale)
{
    // error checking
    if(m_textures == NULL || texture_index >= m_num_textures)
        return FALSE;

    // calculate the source tile coordinates from texture
    long _src_x = (tile_index % m_tile_columns[texture_index]) * m_tile_widths[texture_index];
    long _src_y = (tile_index / m_tile_columns[texture_index]) * m_tile_heights[texture_index];

    return m_textures[texture_index].draw(screen_x ,screen_y, _src_x, _src_y,
        m_tile_widths[texture_index], m_tile_heights[texture_index], x_scale, y_scale, color);
}

MAP类的定义：

/*************************************************************************
PURPOSE:
    Interface for 2D map.
*************************************************************************/

#ifndef _MAP_H_
#define _MAP_H_

#include "core_common.h"

#define MAX_OBJECTS     1024

typedef struct OBJECT_INFO
{
    long x_pos, y_pos;
    char tile_index;
} *OBJECT_INFO_PTR;

//=========================================================================================
// This class encapsulate 2D map draw.
//=========================================================================================
typedef class MAP
{
public:
    MAP();
    ~MAP();

    // function to create and free a map class
    BOOL create(long num_layers, long map_column, long map_row);
    void free();

    // function to set a map's layer data
    BOOL set_map_layer_data(long layer_index, char_ptr layer_data);

    // function to clear and add an object to list
    void clear_object_list();
    BOOL add_object(long x_pos, long y_pos, char tile_index);

    char_ptr get_ptr(long layer_index); // get pointer to map array
    long  get_map_column();             // get column of map
    long  get_map_row();                // get row of map

    // assign TILE object to use for drawing map tiles
    BOOL use_tile(TILE_PTR tile);

    // Render map using specified top-left map coordinates,
    // as well as number of columns and rows to draw, plus layer used to draw objects.
    BOOL render(long pos_x, long pos_y,
                long num_rows, long num_columns,
                long object_layer,
                D3DCOLOR color,
                float scale_x, float scale_y);

private:
    long        m_map_column;       // column of map
    long        m_map_row;          // row of map
    long        m_per_layer_size;   // size of per map

    long        m_num_layers;       // number of layers
    char_ptr    m_map_info;         // array for tile informarion
    TILE_PTR    m_tile;             // pointer to TILE object

    long        m_num_objects_to_draw;       // number of object need to be drawed
    OBJECT_INFO m_objects_info[MAX_OBJECTS]; // object information array
} *MAP_PTR;

#endif

MAP类的实现：

/*************************************************************************
PURPOSE:
    Implement for 2D map.
*************************************************************************/

#include "core_common.h"
#include "core_graphics.h"
#include "tile.h"
#include "map.h"

//----------------------------------------------------------------------------------
// Constructor, zero member data.
//----------------------------------------------------------------------------------
MAP::MAP()
{
    memset(this, 0, sizeof(*this));
}

//----------------------------------------------------------------------------------
// Destructor, release allocated resources.
//----------------------------------------------------------------------------------
MAP::~MAP()
{
    free();
}

//----------------------------------------------------------------------------------
// Release allocated resources.
//----------------------------------------------------------------------------------
void MAP::free()
{
    // free map information array
    delete[] m_map_info;
    m_map_info = NULL;

    m_map_column = m_map_row = 0;
    m_num_layers = 0;
}

//----------------------------------------------------------------------------------
// Create map object.
//----------------------------------------------------------------------------------
BOOL MAP::create(long num_layers, long map_column, long map_row)
{
    // free a prior map
    free();

    // save number of layers, map column and row.
    m_num_layers     = num_layers;
    m_map_column     = map_column;
    m_map_row        = map_row;
    m_per_layer_size = map_column * map_row;

    long total_map_size = num_layers * m_per_layer_size;

    // allocate map data memory
    if((m_map_info = new char[total_map_size]) == NULL)
        return FALSE;

    // clear it out
    ZeroMemory(m_map_info, total_map_size);

    // reset number of objexts to draw
    m_num_objects_to_draw = 0;

    return TRUE;
}

//----------------------------------------------------------------------------------
// Set map data.
//----------------------------------------------------------------------------------
BOOL MAP::set_map_layer_data(long layer_index, char_ptr layer_data)
{
    // error checking
    if(layer_index >= m_num_layers)
        return FALSE;

    // copy over data
    memcpy(&m_map_info[layer_index * m_per_layer_size], layer_data, m_per_layer_size);

    return TRUE;
}

//----------------------------------------------------------------------------------
// Clear object list which need to be drawed.
//----------------------------------------------------------------------------------
void MAP::clear_object_list()
{
    m_num_objects_to_draw = 0;
}

//----------------------------------------------------------------------------------
// Add object to object list.
//----------------------------------------------------------------------------------
BOOL MAP::add_object(long x_pos, long y_pos, char tile_index)
{
    if(m_num_objects_to_draw < MAX_OBJECTS)
    {
        m_objects_info[m_num_objects_to_draw].x_pos      = x_pos;
        m_objects_info[m_num_objects_to_draw].y_pos      = y_pos;
        m_objects_info[m_num_objects_to_draw].tile_index = tile_index;

        m_num_objects_to_draw++;

        return TRUE;
    }

    return FALSE;
}

//----------------------------------------------------------------------------------
// Return pointer to specfied layer map data.
//----------------------------------------------------------------------------------
char_ptr MAP::get_ptr(long layer_index)
{
    if(layer_index >= m_num_layers)
        return NULL;

    return &m_map_info[layer_index * m_per_layer_size];
}

//----------------------------------------------------------------------------------
// Return map columns.
//----------------------------------------------------------------------------------
long MAP::get_map_column()
{
    return m_map_column;
}

//----------------------------------------------------------------------------------
// Return map rows.
//----------------------------------------------------------------------------------
long MAP::get_map_row()
{
    return m_map_row;
}

//----------------------------------------------------------------------------------
// Set tile to map.
//----------------------------------------------------------------------------------
BOOL MAP::use_tile(TILE_PTR tile)
{
    if((m_tile = tile) == NULL)
        return FALSE;

    return TRUE;
}

//----------------------------------------------------------------------------------
// Render map.
//----------------------------------------------------------------------------------
BOOL MAP::render(long pos_x, long pos_y,
                 long num_rows, long num_columns,
                 long object_layer,
                 D3DCOLOR color,
                 float scale_x, float scale_y)
{
    // error checking
    if(m_map_info == NULL || m_tile == NULL)
        return FALSE;

    long _tile_width  = m_tile->get_tile_width(0);
    long _tile_height = m_tile->get_tile_height(0);

    // calculate smooth scrolling variables
    long _map_x = pos_x / _tile_width;
    long _map_y = pos_y / _tile_height;
    long _off_x = pos_x % _tile_width;
    long _off_y = pos_y % _tile_height;

    // loop through each layer
    for(long _layer = 0; _layer < m_num_layers; _layer++)
    {
        // get a pointer to the map data
        char_ptr _map_ptr = &m_map_info[_layer * m_per_layer_size];

        // loop for each row and column
        for(long _row = 0; _row <= num_rows; _row++)
        {
            for(long _column = 0; _column <= num_columns; _column++)
            {
                // get the tile index to draw
                char _tile_index = _map_ptr[(_row + _map_y) * m_map_column + _column + _map_x];

                long _screen_x = _column * _tile_width  - _off_x;
                long _screen_y = _row    * _tile_height - _off_y;

                // draw tile
                m_tile->draw_tile(0, _tile_index, (DWORD)_screen_x, (DWORD)_screen_y, color, scale_x, scale_y);
            }
        }

        // draw objects if on object _layer
        if(_layer == object_layer)
        {
            for(long i = 0; i < m_num_objects_to_draw; i++)
            {
                m_tile->draw_tile(0, m_objects_info[i].tile_index,
                                 m_objects_info[i].x_pos - _off_x, m_objects_info[i].y_pos - _off_y,
                                 color, scale_x, scale_y);
            }
        }
    }

    return TRUE;
}

测试代码1，展示了缩放2D贴片的用法。

测试代码2，展示了平滑卷轴技术的使用。

/*****************************************************************************
PURPOSE:
    Test for class TILE and MAP.
*****************************************************************************/

#include "core_common.h"
#include "core_framework.h"
#include "core_graphics.h"
#include "tile.h"
#include "map.h"

#pragma warning(disable : 4996)

#define TILE_WIDTH      64
#define TILE_HEIGHT     64

#define MAP_COLUMNS     16
#define MAP_ROWS        16

#define TOTAL_MAP_SIZE  1024

class APP : public FRAMEWORK
{
public:
    BOOL init()
    {
        long client_width  = get_client_width(g_hwnd);
        long client_height = get_client_height(g_hwnd);

        m_num_columns_to_draw = client_width  / TILE_WIDTH + 1;
        m_num_rows_to_draw    = client_height / TILE_HEIGHT + 1;

        m_max_move_width  = TOTAL_MAP_SIZE - client_width;
        m_max_move_height = TOTAL_MAP_SIZE - client_height;

        if(! create_display(g_hwnd, get_client_width(g_hwnd), get_client_height(g_hwnd), 16, TRUE, FALSE))
            return FALSE;

        // create and load the tile set

        if(! m_tile.create(1))
            return FALSE;

        if(! m_tile.load_texture(0, "tiles.bmp", TILE_WIDTH, TILE_HEIGHT, TRUE, D3DFMT_A1R5G5B5))
        {
            err_msg_box("load texture failed.");
            return FALSE;
        }

        // create and set the map

        char _map_data[MAP_ROWS][MAP_COLUMNS] = {
            { 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
            { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0 },
            { 1, 2, 2, 1, 2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 0 },
            { 2, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 2, 0, 2, 0 },
            { 2, 2, 2, 2, 2, 0, 0, 2, 2, 2, 2, 0, 0, 0, 2, 0 },
            { 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0 },
            { 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0 },
            { 3, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 0 },
            { 3, 0, 2, 2, 2, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 0 },
            { 0, 0, 2, 2, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 0 },
            { 0, 2, 2, 1, 1, 0, 0, 2, 2, 0, 0, 2, 2, 2, 2, 0 },
            { 0, 1, 2, 2, 2, 0, 0, 2, 2, 0, 0, 2, 1, 1, 2, 0 },
            { 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0 },
            { 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0 },
            { 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
            { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
        };

        m_map.create(1, MAP_COLUMNS, MAP_ROWS);
        m_map.set_map_layer_data(0, (char*) &_map_data);
        m_map.use_tile(&m_tile);

        return TRUE;
    }

    BOOL APP::frame()
    {
        static long _s_x_pos = 0, _s_y_pos = 0;

        // calculate elapsed time
        static DWORD _s_last_time = timeGetTime();
        DWORD _now_time = timeGetTime();

        DWORD _elapsed_time = _now_time - _s_last_time;

        // frame lock to 33ms per frame
        if(_elapsed_time < 33)
            return TRUE;

        _s_last_time = _now_time;

        if(SUCCEEDED(g_d3d_device->BeginScene()))
        {
            if(SUCCEEDED(g_d3d_sprite->Begin(0)))
            {
                // draw the map
                m_map.render(_s_x_pos, _s_y_pos, m_num_rows_to_draw, m_num_columns_to_draw, 0, 0xFFFFFFFF, 1.0f, 1.0f);

                // press arrows to scroll map around

                if(GetAsyncKeyState(VK_LEFT))   _s_x_pos -= 8;
                if(GetAsyncKeyState(VK_RIGHT))  _s_x_pos += 8;
                if(GetAsyncKeyState(VK_UP))     _s_y_pos -= 8;
                if(GetAsyncKeyState(VK_DOWN))   _s_y_pos += 8;

                // bounds check map coordinates

                if(_s_x_pos < 0)
                    _s_x_pos = 0;

                if(_s_x_pos > m_max_move_width)
                    _s_x_pos = m_max_move_width;

                if(_s_y_pos < 0)
                    _s_y_pos = 0;

                if(_s_y_pos > m_max_move_height)
                    _s_y_pos = m_max_move_height;

                 g_d3d_sprite->End();
            }

            g_d3d_device->EndScene();

            present_display();
        }

        return TRUE;
    }

    BOOL shutdown()
    {
        return TRUE;
    }

private:
    TILE        m_tile;
    MAP         m_map;

    long        m_num_columns_to_draw;
    long        m_num_rows_to_draw;

    long        m_max_move_width;
    long        m_max_move_height;
};

int PASCAL WinMain(HINSTANCE inst, HINSTANCE, LPSTR cmd_line, int cmd_show)
{
    DWORD _window_width  = 640;
    DWORD _window_height = 480;
    DWORD _x_pos = (get_screen_width()  - _window_width) / 2;
    DWORD _y_pos = (get_screen_height() - _window_height) / 4;

    if(! build_window(inst, "map_class", "map test", WS_BORDER | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU,
                      _x_pos, _y_pos, _window_width, _window_height))
    {
        return -1;
    }

    APP app;
    app.run();

    return 0;
}

posted on 2007-10-16 21:52 lovedday 阅读(492) 评论(0) 编辑收藏引用所属分类: ■ RPG Program

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