编辑：回答。在我的drawBackground函数中检查g.drawLines时，我正在绘制一个点，而不是一条线。这是用户错误。
我们学校编写了一个标题，简化了大部分的allegro 5.我正在编写一个程序，使用该标题（GameEngineV4）来简单模拟检查器，但是，我在获取电路板时遇到一些困难显示到屏幕。 这是我的代码：
#include "GameEngineV4.h"
#include <iostream>
using namespace std;
void drawBackground(GameEngineV4, const int, const int);
int main()
{
const int BOARD_WIDTH = 600;
const int BOARD_MARGIN = 100;
GameEngineV4 g; // instantiate graphic object
g.initializePanel(800,800); // initialize Window
g.setBackground(g.CYAN); // color the background
drawBackground(g, BOARD_MARGIN, BOARD_WIDTH);
//* cleanup
g.displayPanel();
system("Pause");
g.displayDelay(1.0); // wait 10 seconds
g.closePanel();
return 0;
}
void drawBackground(GameEngineV4 g, const int BOARD_MARGIN, const int BOARD_WIDTH){
g.setColor(g.BLACK);
int i = 0;
int offset = (BOARD_WIDTH / 8) * i; //Variable to hold the amount a line should be shifted from original.
for (i = 0; i < 9; i++){
offset = (BOARD_WIDTH / 8) * i;
g.drawLine(BOARD_MARGIN, BOARD_MARGIN + offset, BOARD_MARGIN, BOARD_MARGIN + offset); //Horizontal lines
g.drawLine(BOARD_MARGIN + offset, BOARD_MARGIN, BOARD_MARGIN + offset, BOARD_MARGIN); //Vertical lines
}
}
困难在于drawBackground函数中的某个地方。我首先通过用g.drawLine(50, 50 + offset, 450, 450 + offset);替换for循环中的drawLine代码来测试drawBackground函数，然后显示的代码就好了。为什么更改它以使用常量计算会影响我的代码？
在Windows 7上的Visual Studio 2013中编码和编译。
编辑：当然，如果我包含GameEngineV4的标题和实现，那会更简单
这里是GameEngineV4.h：
#ifndef _GameEngineV4
#define _GameEngineV4
#include <string>
#include <allegro5\allegro.h>
#include <allegro5\allegro_primitives.h> //Our primitive header file
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_ttf.h>
using namespace std;
class GameEngineV4
{
private:
int gSleep;
int gSpeed;
bool appRunning;
ALLEGRO_COLOR colortable[32];
ALLEGRO_FONT * fonttable[32];
int keyTable[256];
int default_pen;
int default_brush;
int default_font;
int default_BGColor;
double default_thickness;
bool keyPressed;
int pressedChar;
ALLEGRO_DISPLAY *gdisplay;
public:
GameEngineV4();
//-------------------------------------------------
// Game Engine Functions
//-------------------------------------------------
// call to return last key pressed
int gameLastkey();
// call to set game speed;
void gameSetGameSpeed(int);
void gameSetSpeed(int);
// call to set game speed;
int gameGetGameSpeed();
int gameGetSpeed();
// call to set display delay;
void gameSetDisplayDelay(int);
// start game
int gameEngineMain(void);
// call to repaint window
void gameRepaint();
// creates and fills a rectangle color is index into standard color table
void fill_rect(int xl,int yl,int xr,int yr,int penColor,int brushColor);
void fill_rect(int x1,int y1,int w,int h);
// creates and fills an ellipse
void fill_ellipse(int x1 ,int y ,int w,int h,int penColor,int brushColor);
void fill_ellipse(int x1,int y1,int w,int h);
// text out string, x, y, color code
void text_out(char *,int ,int ,int);
void text_out(char *txt, int x,int y);
void text_out(LPCSTR txt,int x,int y,int clr);
void text_out(LPCSTR txt,int x,int y);
// draw line from point1(x1,y1) to point2(x2,y2)
void draw_line(int x1,int y1,int x2,int y2); // uses default color
void draw_line(int x1,int y1,int x2,int y2,int color);
// draws ellipse
void draw_ellipse(int x1,int y1,int w,int h,int penColor,int brushColor);
void draw_ellipse(int x1,int y1,int w,int h); // uses default color
// draws rectangle
void draw_rect(int x1,int y1,int w,int h,int penColor,int brushColor);
void draw_rect(int x1,int y1,int w,int h);
// sets default color
void color(int pen,int brush);
// sets default pen color
void pen_color(int pen);
// sets default brush
void brush_color(int brush);
// register call backs
void registerGameMain(void (*fun)());
void registerGameInit(void (*fun)());
void registerGameQuit(void (*fun)());
void registerGamePaint(void (*fun)());
void registerGameKeyUp(void (*fun)(int));
void registerGameKeyDown(void (*fun)(int));
void registerGameLMouse(void (*fun)(int,int,int));
void registerGameRMouse(void (*fun)(int,int,int));
void registerGameMoveMouse(void (*fun)(int,int,int));
void playBeep1();
void playBeep2();
void playBeep(float g, float s );
void playWav(char * filename, float gain, float speed, float duration);
void playWave(string filename, float gain, float speed, float duration);
int initializeAudio(int samples);
//-----------------------------------------------
// call back functions
//-----------------------------------------------
// called during initialization
void gameInit();
// called during initialization
void gameMain();
// called at exit
void gameQuit();
// called to repaint screen
void gamePaint();
// keyboard and mouse functions
void gameKeyUp(int);
void gameKeyDown(int);
void gameLMouse(int,int,int);
void gameRMouse(int,int,int);
void gameMoveMouse(int,int,int);
// initialization methods
void initColorTable();
void initFontTable();
void initKeyTable();
void GoPaint();
// Alternate Graphics functions
int initializePanel(int width, int height);
int initializePanel(int width, int height, int color);
void closePanel();
void displayPanel();
void displayDelay(double delay);
void setBackground(int color);
void setBackground(int r, int g, int b);
void setThickness(double t);
void setPenColor(int pen);
void setColor(int pen);
void setColor(int r, int g, int b);
void setBrushColor(int brush);
void setBrushColor(int r, int g, int b);
void setFont(int font);
void setFontSize(int fontSize, int flag);
void setFont(string family, int fontSize, int flag);
void drawLine(int x1, int y1, int x2, int y2);
void drawOval(int x1,int y1,int w,int h);
void drawRect(int x1,int y1,int w,int h);
void drawString(char *txt,int x,int y);
void drawString(string txt,int x,int y);
void drawARC(int x1,int y1,int r, int w,int h,float st, float dt);
void fillOval(int x1,int y1,int w,int h);
void fillRect(int x1,int y1,int w,int h);
void drawTriangle(float x1, float y1, float x2, float y2 , float x3, float y3);
void fillTriangle(float x1, float y1, float x2, float y2 , float x3, float y3);
void fillRibbon(int x1,int y1,int x2,int y2, int w);
void drawRibbon(int x1,int y1,int x2,int y2, int w);
enum color{BLACK,BLUE,CYAN,DARK_GRAY,GRAY,GREEN,
LIGHT_GRAY,MAGENTA,ORANGE,PINK,RED,WHITE,YELLOW,
MAROON,PURPLE,LIME,OLIVE,NAVY,TEAL};
};
#endif
这是实施，GameEngineV4.cpp：
//-------------------------------------------------------
//-------------------------------------------------------
// GameEngine Version 4.2 - Allegro, class Based, and
// registered callbacks
// 4.1
// 4.2 Enhanced Audio
//-------------------------------------------------------
//-------------------------------------------------------
#include <iostream>
#include <string>
#include "GameEngineV4.h"
#include <allegro5\allegro.h>
#include <allegro5\allegro_primitives.h> //Our primitive header file
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_ttf.h>
#include <allegro5\allegro_audio.h>
#include <allegro5\allegro_acodec.h>
using namespace std;
//-------------------------------------------------------
// Definitions
//-------------------------------------------------------
#define WINDOW_WIDTH 800 // default size of game window
#define WINDOW_HEIGHT 600
#define T2SLEEP 20 // thread 2 default sleep time
#define T1SPEED 700000 // thread 1 default delay loops
//-------------------------------------------------------
// Global Variables
//-------------------------------------------------------
ALLEGRO_SAMPLE *beep1 = NULL;
ALLEGRO_SAMPLE *beep2 = NULL;
//-------------------------------------------------------
// Function pointers
//-------------------------------------------------------
void (*pGameMain) ()=NULL;
void (*pGameInit) ()=NULL;
void (*pGameQuit) ()=NULL;
void (*pGamePaint) ()=NULL;
void (*pGameKeyUp) (int)=NULL;
void (*pGameKeyDown) (int)=NULL;
void (*pGameLMouse) (int,int,int)=NULL;
void (*pGameRMouse) (int,int,int)=NULL;
void (*pGameMoveMouse) (int,int,int)=NULL;
enum KEYS{ UP, DOWN, LEFT, RIGHT};
GameEngineV4::GameEngineV4()
{
gSleep=T2SLEEP;
gSpeed=T1SPEED;
appRunning=false;
for (int i=0;i<256;i++)
keyTable[i]=0;
default_pen=0;
default_brush=0;
default_font=0;
default_BGColor=0;
default_thickness=2.0;
gdisplay = NULL;
}
int GameEngineV4::gameEngineMain(void)
{
int width = WINDOW_WIDTH;
int height = WINDOW_HEIGHT;
bool done = false;
bool redraw = true;
int pos_x = width / 2;
int pos_y = height / 2;
int FPS = 60;
bool keys[4] = {false, false, false, false};
ALLEGRO_DISPLAY *display = NULL;
ALLEGRO_EVENT_QUEUE *event_queue = NULL;
ALLEGRO_TIMER *timer = NULL;
if(!al_init()) //initialize Allegro
return -1;
display = al_create_display(width, height); //create our display object
if(!display) //test display object
return -1;
al_init_primitives_addon();
al_install_keyboard();
al_install_mouse();
al_init_font_addon();
al_init_ttf_addon();
al_install_audio();
al_init_acodec_addon();
al_reserve_samples(10);
beep1 = al_load_sample("beep1.ogg");
beep2 = al_load_sample("beep2.ogg");
initColorTable();
initFontTable();
initKeyTable();
gameInit();
//CreateThread(0,0,ThreadProc1,0,0,0);
//CreateThread(0,0,ThreadProc2,0,0,0);
event_queue = al_create_event_queue();
timer = al_create_timer(1.0 / gameGetSpeed());
al_register_event_source(event_queue, al_get_keyboard_event_source());
al_register_event_source(event_queue, al_get_mouse_event_source());
al_register_event_source(event_queue, al_get_display_event_source(display));
al_register_event_source(event_queue, al_get_timer_event_source(timer));
al_start_timer(timer);
while(!done)
{
ALLEGRO_EVENT ev;
al_wait_for_event(event_queue, &ev);
if(ev.type == ALLEGRO_EVENT_KEY_DOWN)
{
keyPressed=true;
pressedChar=keyTable[(int)ev.keyboard.keycode];
gameKeyDown(keyTable[(int)ev.keyboard.keycode]);
}
else if(ev.type == ALLEGRO_EVENT_KEY_UP)
{
keyPressed=true;
pressedChar=keyTable[(int)ev.keyboard.keycode];
gameKeyUp(keyTable[(int)ev.keyboard.keycode]);
}
else if(ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
{
done = true;
}
else if(ev.type == ALLEGRO_EVENT_TIMER)
{
gameMain();
redraw = true;
}else if (ev.type== ALLEGRO_EVENT_MOUSE_AXES)
{
gameMoveMouse(ev.mouse.x,ev.mouse.y,1);
}else if(ev.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN)
{
if (ev.mouse.button & 1)
{
gameLMouse(ev.mouse.x,ev.mouse.y,1);
}
if (ev.mouse.button & 2)
{
gameRMouse(ev.mouse.x,ev.mouse.y,1);
}
}
if(redraw && al_is_event_queue_empty(event_queue))
{
redraw = false;
gamePaint();
al_flip_display();
al_clear_to_color(colortable[default_BGColor]);
}
}
al_destroy_sample(beep1);
al_destroy_sample(beep2);
al_destroy_event_queue(event_queue);
al_destroy_timer(timer);
al_destroy_display(display); //destroy our display object
return 0;
}
/*
//-------------------------------------------------------
// Additional Game Threads
//-------------------------------------------------------
DWORD WINAPI ThreadProc1(LPVOID lpParameter)
{
gameMain1();
return 0;
}
DWORD WINAPI ThreadProc2(LPVOID lpParameter)
{
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
while(appRunning)
{
gameMain2();
GoPaint(NULL,NULL);
Sleep(gSleep);
}
return 0;
}
*/
//-------------------------------------------------------
// register callbacks and callbacks
//-------------------------------------------------------
void GameEngineV4:: registerGameMain(void (*fun)() )
{
pGameMain = fun ;
}
void GameEngineV4::gameMain()
{
if (pGameMain !=NULL) pGameMain();
}
void GameEngineV4:: registerGameInit(void (*fun)() )
{
pGameInit = fun ;
}
void GameEngineV4::gameInit()
{
if (pGameInit !=NULL) pGameInit();
}
void GameEngineV4:: registerGameQuit(void (*fun)() )
{
pGameQuit = fun ;
}
void GameEngineV4::gameQuit()
{
if (pGameQuit !=NULL) pGameQuit();
}
void GameEngineV4:: registerGamePaint(void (*fun)() )
{
pGamePaint = fun ;
}
void GameEngineV4::gamePaint()
{
if (pGamePaint !=NULL) pGamePaint();
}
void GameEngineV4:: registerGameKeyUp(void (*fun)(int) )
{
pGameKeyUp = fun ;
}
void GameEngineV4::gameKeyUp(int x)
{
if (pGameKeyUp !=NULL) pGameKeyUp(x);
}
void GameEngineV4:: registerGameKeyDown(void (*fun)(int) )
{
pGameKeyDown = fun ;
}
void GameEngineV4::gameKeyDown(int x)
{
if (pGameKeyDown !=NULL) pGameKeyDown(x);
}
void GameEngineV4:: registerGameLMouse(void (*fun)(int,int,int) )
{
pGameLMouse = fun ;
}
void GameEngineV4::gameLMouse(int x, int y, int z)
{
if (pGameLMouse !=NULL) pGameLMouse(x, y, z);
}
void GameEngineV4:: registerGameRMouse(void (*fun)(int,int,int) )
{
pGameRMouse = fun ;
}
void GameEngineV4::gameRMouse(int x, int y, int z)
{
if (pGameRMouse !=NULL) pGameRMouse(x, y, z);
}
void GameEngineV4:: registerGameMoveMouse(void (*fun)(int,int,int) )
{
pGameMoveMouse = fun ;
}
void GameEngineV4::gameMoveMouse(int x, int y, int z)
{
if (pGameMoveMouse !=NULL) pGameMoveMouse(x, y, z);
}
//-------------------------------------------------------
// Pens and Brushes
//-------------------------------------------------------
void GameEngineV4::initColorTable()
{
colortable[0]=al_map_rgb(0,0,0); // black
colortable[1]=al_map_rgb(0,0,255); // blue
colortable[2]=al_map_rgb(0,255,255); // cyan /aqua
colortable[3]=al_map_rgb(96,96,96); // dark gray
colortable[4]=al_map_rgb(160,160,160); // gray
colortable[5]=al_map_rgb(0,160,0); // green
colortable[6]=al_map_rgb(192,192,192); // light gray /silver
colortable[7]=al_map_rgb(255,0,255); // magenta
colortable[8]=al_map_rgb(255,165,0); // orange
colortable[9]=al_map_rgb(255,160,203); // pink
colortable[10]=al_map_rgb(255,0,0); // red
colortable[11]=al_map_rgb(255,255,255); // white
colortable[12]=al_map_rgb(255,255,0); // yellow
colortable[13]=al_map_rgb(160,0,0); // maroon
colortable[14]=al_map_rgb(160,0,160); // purplE
colortable[15]=al_map_rgb(0,255,0); // lime
colortable[16]=al_map_rgb(160,160,0); // olive
colortable[17]=al_map_rgb(0,0,160); // navy
colortable[18]=al_map_rgb(0,160,160); // teal
}
void GameEngineV4::initFontTable()
{
fonttable[0] = al_load_font("arial.ttf", 16, 1);
fonttable[1] = al_load_font("arial.ttf", 32, 2);
fonttable[2] = al_load_font("arial.ttf", 48, 2);
}
void GameEngineV4::initKeyTable()
{
for (int i=0; i< 256;i++)
keyTable[i]=0; // zero
keyTable[84]=0x26; // keyup
keyTable[85]=0x28; // key down
keyTable[82]=0x25; // left
keyTable[83]=0x27; // right
for (int i=0; i< 26;i++)
keyTable[i+1]=i+0x41; // a-z
for (int i=0; i< 9;i++)
keyTable[i+27]=i+0x30; // 0-9
for (int i=0; i< 9;i++)
keyTable[i+37]=i+0x60; // 0-9 key pad
for (int i=0; i< 12;i++)
keyTable[i+47]=i+0x70; // F1-F12
keyTable[59]=0x1b; // escape
keyTable[61]=0x6d; // minus
keyTable[63]=0x08; // backspace
keyTable[64]=0x09; // tab
keyTable[75]=0x20; // space
keyTable[67]=0x0d; // return or enter
}
//-------------------------------------------------------
// Text Procssing
//-------------------------------------------------------
void GameEngineV4::text_out(char *txt,int x,int y,int clr)
{
al_draw_text(fonttable[default_font], colortable[clr], x, y, 0, txt);
}
void GameEngineV4::text_out(char *txt,int x,int y)
{
al_draw_text(fonttable[default_font], colortable[default_pen], x, y, 0, txt);
}
//-------------------------------------------------------
// Functions to Draw Lines and Shapes
//-------------------------------------------------------
void GameEngineV4::draw_line(int x1,int y1,int x2,int y2)
{
al_draw_line(x1, y1, x2, y2, colortable[default_pen],default_thickness);
}
void GameEngineV4::draw_line(int x1,int y1,int x2,int y2,int clr)
{
al_draw_line(x1, y1, x2, y2, colortable[clr] ,default_thickness);
}
void GameEngineV4::draw_ellipse(int x1,int y1,int w,int h,int penClr,int brushClr)
{
int w1=w/2;
int h1=h/2;
al_draw_ellipse(x1+w1, y1+h1, w1, h1, colortable[penClr], default_thickness);
}
void GameEngineV4::draw_rect(int x1,int y1,int w,int h)
{
al_draw_rectangle(x1,y1,x1+w,y1+h,colortable[default_pen],default_thickness);
}
void GameEngineV4::draw_rect(int x1,int y1,int w,int h,int penClr,int brushClr)
{
al_draw_rectangle(x1,y1,x1+w,y1+h,colortable[penClr],default_thickness);
}
void GameEngineV4::draw_ellipse(int x1,int y1,int w,int h)
{
int w1=w/2;
int h1=h/2;
al_draw_ellipse(x1, y1, w1, h1, colortable[default_pen], default_thickness);
}
void GameEngineV4::fill_ellipse(int x1,int y1,int w,int h,int penClr,int brushClr)
{
int w1=w/2;
int h1=h/2;
al_draw_filled_ellipse (x1+w1,y1+h1,w1,h1,colortable[penClr]);
}
void GameEngineV4::fill_ellipse(int x1,int y1,int w,int h)
{
int w1=w/2;
int h1=h/2;
al_draw_filled_ellipse (x1+w1,y1+h1,w1,h1,colortable[default_brush]);
}
void GameEngineV4::fill_rect(int x1,int y1,int w,int h)
{
al_draw_filled_rectangle(x1,y1,x1+w,y1+h,colortable[default_brush]);
}
void GameEngineV4::fill_rect(int x1,int y1,int w,int h,int penClr,int brushClr)
{
al_draw_filled_rectangle(x1,y1,x1+w,y1+h,colortable[penClr]);
}
void GameEngineV4::color(int pen,int brush)
{
default_pen=pen;
default_brush=brush;
}
void GameEngineV4::pen_color(int pen)
{
default_pen=pen;
}
void GameEngineV4::brush_color(int brush)
{
default_brush=brush;
}
int GameEngineV4::gameLastkey()
{
if(!keyPressed)
{
return 0;
}
else
{
keyPressed=false;
return pressedChar;
}
}
void GameEngineV4::gameSetSpeed(int x)
{
gSpeed=x;
}
void GameEngineV4::gameSetGameSpeed(int x)
{
gSpeed=x;
}
void GameEngineV4::gameSetDisplayDelay(int x)
{
gSleep=x;
}
int GameEngineV4::gameGetSpeed()
{
return gSpeed;
}
int GameEngineV4::gameGetGameSpeed()
{
return gSpeed;
}
// graphics interface
int GameEngineV4::initializePanel(int width, int height)
{
if(!al_init()) //initialize Allegro
return -1;
gdisplay = al_create_display(width, height); //create our display object
if(!gdisplay) //test display object
return -1;
al_init_primitives_addon();
al_install_keyboard();
al_install_mouse();
al_init_font_addon();
al_init_ttf_addon();
al_install_audio();
al_init_acodec_addon();
al_reserve_samples(100);
initColorTable();
initFontTable();
initKeyTable();
return 0;
}
void GameEngineV4::closePanel()
{
al_destroy_display(gdisplay); //destroy our display object
return;
}
void GameEngineV4::displayPanel()
{
al_flip_display();
}
void GameEngineV4::setBackground(int color)
{
default_BGColor =color;
al_clear_to_color(colortable[default_BGColor]);
}
void GameEngineV4::setBackground(int r, int g, int b)
{
colortable[30] =al_map_rgb(r,g,b);
default_BGColor =30;
al_clear_to_color(colortable[default_BGColor]);
}
void GameEngineV4::setThickness(double t)
{
default_thickness=t;
}
void GameEngineV4::setPenColor(int pen)
{
default_pen=pen;
}
void GameEngineV4::setColor(int clr)
{
default_pen=clr;
default_brush=clr;
}
void GameEngineV4::setColor(int r, int g, int b)
{
colortable[31] =al_map_rgb(r,g,b);
default_pen=31;
}
void GameEngineV4::setBrushColor(int brush)
{
default_brush=brush;
}
void GameEngineV4::setBrushColor(int r, int g, int b)
{
colortable[30] =al_map_rgb(r,g,b);
default_brush=30;
}
void GameEngineV4::setFont(int font)
{
default_font=font;
}
void GameEngineV4::setFontSize(int fontSize, int flag)
{
fonttable[31] = al_load_font("arial.ttf", fontSize, flag);
default_font=31;
}
void GameEngineV4::setFont(string family, int fontSize, int flag)
{
fonttable[31] = al_load_font(family.c_str(), fontSize, flag);
default_font=31;
}
void GameEngineV4::drawLine(int x1, int y1, int x2, int y2)
{
al_draw_line(x1, y1, x2, y2, colortable[default_pen] ,default_thickness);
}
void GameEngineV4::drawOval(int x1,int y1,int w,int h)
{
int w1=w/2;
int h1=h/2;
al_draw_ellipse(x1+w1, y1+h1, w1, h1, colortable[default_pen], default_thickness);
}
void GameEngineV4::drawRect(int x1,int y1,int w,int h)
{
al_draw_rectangle(x1,y1,x1+w,y1+h,colortable[default_pen],default_thickness);
}
void GameEngineV4::drawString(char *txt,int x,int y)
{
text_out(txt,x,y);
}
void GameEngineV4::drawString(string txt,int x,int y)
{
al_draw_text(fonttable[default_font], colortable[default_pen], x, y, 0, txt.c_str());
}
void GameEngineV4::fillOval(int x1,int y1,int w,int h)
{
int w1=w/2;
int h1=h/2;
al_draw_filled_ellipse (x1+w1,y1+h1,w1,h1,colortable[default_brush]);
}
void GameEngineV4::fillRect(int x1,int y1,int w,int h)
{
al_draw_filled_rectangle(x1,y1,x1+w,y1+h,colortable[default_brush]);
}
void GameEngineV4::displayDelay(double d)
{
al_rest(d);
}
void GameEngineV4::drawARC(int x1,int y1, int r, int w,int h,float st, float dt)
{
int w1=w/2;
int h1=h/2;
float dt1=3.14 * (dt*-1)/180.0;
float st1=3.14 * (st*-1)/180.0;
al_draw_arc(x1+w1,y1+h1,r,st1,dt1,colortable[default_brush],default_thickness);
}
void GameEngineV4::playBeep1()
{
al_play_sample(beep1, 1, 0, 1, ALLEGRO_PLAYMODE_ONCE, 0);
}
void GameEngineV4::playBeep2()
{
al_play_sample(beep2, 1, 0, 1 , ALLEGRO_PLAYMODE_ONCE, 0);
}
void GameEngineV4::playBeep(float g, float s )
{
al_play_sample(beep1, g, 0, s, ALLEGRO_PLAYMODE_ONCE, 0);
}
void GameEngineV4::playWav(char filename[], float gain, float speed, float duration )
{
ALLEGRO_SAMPLE *soundeffect = al_load_sample(filename);
al_play_sample(soundeffect,gain,0.0, speed, ALLEGRO_PLAYMODE_ONCE, 0);
al_rest(duration);
al_destroy_sample(soundeffect);
}
void GameEngineV4::playWave(string filename, float gain, float speed, float duration )
{
ALLEGRO_SAMPLE *soundeffect = al_load_sample(filename.c_str());
al_play_sample(soundeffect,gain,0.0, speed, ALLEGRO_PLAYMODE_ONCE, 0);
al_rest(duration);
al_destroy_sample(soundeffect);
}
// audio interface
int GameEngineV4::initializeAudio(int samples)
{
if(!al_init()) //initialize Allegro
return -1;
al_install_audio();
al_init_acodec_addon();
al_reserve_samples(samples);
return 0;
}
void GameEngineV4::drawTriangle(float x1, float y1, float x2, float y2 , float x3, float y3)
{
al_draw_triangle(x1,y1,x2,y2,x3,y3,colortable[default_pen],default_thickness);
}
void GameEngineV4::fillTriangle(float x1, float y1, float x2, float y2 , float x3, float y3)
{
al_draw_filled_triangle(x1,y1,x2,y2,x3,y3,colortable[default_brush]);
}
void GameEngineV4::fillRibbon(int x1,int y1,int x2,int y2, int w)
{
struct MyPoint
{
float x, y;
};
const size_t num_points1 = 2;
MyPoint points1[] =
{
{x1, y1},
{x2, y2}
};
al_draw_ribbon((float*)points1, sizeof(MyPoint), colortable[default_brush], w, num_points1);
}
void GameEngineV4::drawRibbon(int x1,int y1,int x2,int y2, int w)
{
fillRibbon(x1,y1,x2,y2, w);
}
编辑：回答。有关详细信息，请参阅顶部。
答案 0 :(得分：0)
在我的drawBackground函数中，我应该提供行的起点和行的结束点。我为起点和终点提供了相同的观点。最终结果，没有显示。