我正在使用C和Allegro 5进行简单的游戏。我目前正在隐藏鼠标并将其交换为自定义鼠标图标。每当检测到鼠标移动时，光标图标的位置都会改变。
让我困扰的是，例如，如果我的鼠标光标位于坐标mouse_x = 100和mouse_y = 200，并且我按下键盘上的任意键，鼠标光标将被传送到坐标mouse_x = 0和mouse_y =按下键时为0。
我不知道会发生什么，但每当我使用al_uninstall_keyboard（）卸载键盘时，该错误就消失了。
这是我的代码：
#include <stdio.h>
#include <stdlib.h>
#include <allegro5\allegro.h>
#include <allegro5\allegro_image.h>
#include <allegro5\allegro_primitives.h>
#include <allegro5\allegro_audio.h>
#include <allegro5\allegro_font.h>
#include <allegro5\allegro_ttf.h>
#include <allegro5\allegro_acodec.h>
enum gameMode{menu, farmGame, stdend};
enum soil{normal, wet};
enum soil2{unplow, plow};
enum cropType{none, tomato};
typedef struct gDisp //game display
{
int width;
int height;
ALLEGRO_DISPLAY *display;
}gDisp;
typedef struct fCrop //farm crop
{
cropType crop;
ALLEGRO_TIMEOUT *waterNeed;
ALLEGRO_TIMEOUT *growth[4]; //Crop's growth time on all stages
}fCrop;
typedef struct fTile //farm tiles
{
int xpoint;
int ypoint;
int size;
soil ground;
soil2 ground2;
fCrop crop;
}fTile;
int main()
{
//Allegro Initialization Area
al_init();
al_init_image_addon();
al_init_primitives_addon();
al_init_font_addon();
al_init_ttf_addon();
al_init_acodec_addon();
//Allegro Installation Area
al_install_keyboard();
al_install_mouse();
//Allegro Variable Area
ALLEGRO_EVENT_QUEUE *queue = al_create_event_queue();
ALLEGRO_EVENT ev;
ALLEGRO_FONT *font[3];
//Allegro Variable Declaration Area
//My Enums Area
gameMode gamemode = menu;
ALLEGRO_BITMAP *bmp[30]; //20-30: Menu Bitmaps
ALLEGRO_BITMAP *ico;
//My Structs Area
gDisp disp;
disp = {0, 0, NULL};
//Games... Here we go!
if (gamemode == menu)
{
char *currgamelist[4] = { "PLAY", "TUTORIAL", "CREDITS" };
disp.width = 600, disp.height = 600, disp.display = al_create_display(disp.width, disp.height);
ico = al_load_bitmap("tomato_seedbase.png");
bmp[0] = al_load_bitmap("Normal-select.png");
bmp[1] = al_load_bitmap("Link-select.png");
al_set_window_title(disp.display, "Farming Hero");
al_set_display_icon(disp.display, ico);
al_hide_mouse_cursor(disp.display);
font[0] = al_load_font("PressStart2P.ttf", 32, 0);
al_clear_to_color(al_map_rgb(0, 0, 0));
al_register_event_source(queue, al_get_mouse_event_source());
al_register_event_source(queue, al_get_keyboard_event_source());
int mouse_x;
int mouse_y;
while (gamemode == menu)
{
al_wait_for_event(queue, &ev);
al_clear_to_color(al_map_rgb(0, 0, 0));
if (ev.type == ALLEGRO_EVENT_KEY_DOWN)
if (ev.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
{
al_destroy_display(disp.display);
al_destroy_font(font[0]);
return 0;
}
al_draw_text(font[0], al_map_rgb(255, 255, 255), 105, 50, 0, "FARMING HERO");
al_draw_text(font[0], al_map_rgb(255, 255, 255), 30, 200, 0, currgamelist[0]);
al_draw_text(font[0], al_map_rgb(255, 255, 255), 30, 300, 0, currgamelist[1]);
al_draw_text(font[0], al_map_rgb(255, 255, 255), 30, 400, 0, currgamelist[2]);
al_draw_text(font[0], al_map_rgb(255, 255, 255), 30, 500, 0, "EXIT");
al_draw_text(font[0], al_map_rgb(255, 255, 255), 30, 500, 0, " ");
if(ev.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN)
if (ev.mouse.button & 1)
{
if (ev.mouse.x >= 30 && ev.mouse.y >= 200 && ev.mouse.x <= al_get_text_width(font[0], currgamelist[0]) + 30 && ev.mouse.y <= 232)
gamemode = farmGame;
if (ev.mouse.x >= 30 && ev.mouse.y >= 300 && ev.mouse.x <= al_get_text_width(font[0], currgamelist[1]) + 30 && ev.mouse.y <= 332)
al_destroy_display(disp.display), al_destroy_font(font[0]), exit(0);
if (ev.mouse.x >= 30 && ev.mouse.y >= 400 && ev.mouse.x <= al_get_text_width(font[0], currgamelist[2]) + 30 && ev.mouse.y <= 432)
al_destroy_display(disp.display), al_destroy_font(font[0]), exit(0);
if (ev.mouse.x >= 30 && ev.mouse.y >= 500 && ev.mouse.x <= al_get_text_width(font[0], "EXIT") + 30 && ev.mouse.y <= 532)
al_destroy_display(disp.display), al_destroy_font(font[0]), exit(0);
}
if (ev.type == ALLEGRO_EVENT_MOUSE_AXES)
mouse_x = ev.mouse.x, mouse_y = ev.mouse.y;
if (mouse_x >= 30 && mouse_x <= al_get_text_width(font[0], currgamelist[0]) + 30 && mouse_y >= 195 && mouse_y <= 235)
al_draw_text(font[0], al_map_rgb(255, 239, 0), 30, 200, 0, currgamelist[0]), al_draw_bitmap(bmp[1], mouse_x, mouse_y, 0);
else if (mouse_x >= 30 && mouse_x <= al_get_text_width(font[0], currgamelist[1]) + 30 && mouse_y >= 295 && mouse_y <= 335)
al_draw_text(font[0], al_map_rgb(255, 239, 0), 30, 300, 0, currgamelist[1]), al_draw_bitmap(bmp[1], mouse_x, mouse_y, 0);
else if (mouse_x >= 30 && mouse_x <= al_get_text_width(font[0], currgamelist[2]) + 30 && mouse_y >= 395 && mouse_y <= 435)
al_draw_text(font[0], al_map_rgb(255, 239, 0), 30, 400, 0, currgamelist[2]), al_draw_bitmap(bmp[1], mouse_x, mouse_y, 0);
else if (mouse_x >= 30 && mouse_x <= al_get_text_width(font[0], "EXIT") + 30 && mouse_y >= 495 && mouse_y <= 535)
al_draw_text(font[0], al_map_rgb(255, 239, 0), 30, 500, 0, "EXIT"), al_draw_bitmap(bmp[1], mouse_x, mouse_y, 0);
else{ al_draw_bitmap(bmp[0], mouse_x, mouse_y, 0); };
al_flip_display();
}
}
if (gamemode == farmGame)
{
ALLEGRO_TIMER *fps = al_create_timer(1.00 / 60.00);
font[0] = al_load_font("PressStart2P.ttf", 8, 0);
font[1] = al_load_font("PressStart2P.ttf", 16, 0);
al_register_event_source(queue, al_get_timer_event_source(fps));
int mouse_x, mouse_y;
mouse_x = -50, mouse_y = 0;
fCrop empty = { none, 0, 0 };
fTile tile[100];
int x_prep, y_prep; //prepare the tile's configuration
x_prep = 0, y_prep = 0;
for (int i = 0; i < 100; i++)
{
if (x_prep == 10)
x_prep = 0, y_prep++;
tile[i] = { x_prep, y_prep, 51, normal, unplow, empty};
x_prep++;
}
al_clear_to_color(al_map_rgb(0, 0, 0));
al_flip_display();
bmp[0] = al_load_bitmap("link-select.png");
bmp[1] = al_load_bitmap("ground_normal.png");
bmp[9] = al_create_bitmap(disp.width, disp.height);
bmp[30] = al_load_bitmap("tomato_seedbase.png");
al_uninstall_keyboard();
al_start_timer(fps);
al_set_target_bitmap(bmp[9]);
al_draw_filled_rectangle(512, 2, disp.width - 2, 508, al_map_rgb(150, 120, 0));
al_draw_filled_rectangle(2, 512, 512, disp.height - 2, al_map_rgb(150, 120, 0));
al_draw_filled_rectangle(512, 512, disp.width - 2, disp.height - 2, al_map_rgb(150, 120, 0));
al_draw_rectangle(512, 2, disp.width - 2, 511, al_map_rgb(70, 50, 0), 5);
al_draw_rectangle(2, 512, 512, disp.height - 2, al_map_rgb(70, 50, 0), 5);
al_draw_rectangle(512, 512, disp.width - 2, disp.height - 2, al_map_rgb(70, 50, 0), 5);
al_set_target_backbuffer(disp.display);
while (gamemode == farmGame)
{
char tileinfo[5][15];
al_clear_to_color(al_map_rgb(0, 0, 0));
al_wait_for_event(queue, &ev);
for (int i = 0; i < 100; i++)
{
if (tile[i].ground == normal && tile[i].ground2 == unplow)
al_draw_bitmap(bmp[1], tile[i].xpoint * tile[i].size, tile[i].ypoint * tile[i].size, 0);
if (mouse_x >= 0 && mouse_x <= 508 && mouse_y >= 0 && mouse_y <= 508)
if (mouse_x >= tile[i].xpoint * tile[i].size && mouse_x <= tile[i].xpoint * tile[i].size + tile[i].size && mouse_y >= tile[i].ypoint * tile[i].size && mouse_y <= tile[i].ypoint * tile[i].size + tile[i].size)
{
tile[i].crop.crop == none ? strcpy(tileinfo[1], "NONE") : 0, tile[i].crop.crop == tomato ? strcpy(tileinfo[1], "TOMATOES") : 0;
tile[i].ground == normal ? strcpy(tileinfo[2], "DRY") : 0, tile[i].ground == wet ? strcpy(tileinfo[2], "WET") : 0;
tile[i].ground2 == unplow ? strcpy(tileinfo[3], "UNPLOW") : 0, tile[i].ground2 == plow ? strcpy(tileinfo[3], "PLOW") : 0;
}
}
al_draw_bitmap(bmp[0], ev.mouse.x, ev.mouse.y, 0);
if (ev.type == ALLEGRO_EVENT_MOUSE_AXES)
mouse_x = ev.mouse.x, mouse_y = ev.mouse.y;
if (ev.type == ALLEGRO_EVENT_KEY_DOWN)
if (ev.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
gamemode = stdend;
al_draw_bitmap(bmp[9], 0, 0, 0);
if (mouse_x >= 503 && mouse_x <= disp.height && mouse_y >= 10 && mouse_y <= al_get_bitmap_height(bmp[30]))
al_draw_tinted_bitmap(bmp[30], al_map_rgb(125, 255, 37), 503, 10, 0), al_draw_text(font[1], al_map_rgb(125, 255, 37), 525, 100, 0, "SHOP");
else{ al_draw_bitmap(bmp[30], 503, 10, 0), al_draw_text(font[1], al_map_rgb(255, 255, 255), 525, 100, 0, "SHOP"); }
if (tileinfo[1] != NULL && tileinfo[2] != NULL && tileinfo[3] != NULL)
{
al_draw_textf(font[0], al_map_rgb(255, 255, 255), 520, 520, 0, "%s", tileinfo[1]);
al_draw_textf(font[0], al_map_rgb(255, 255, 255), 520, 550, 0, "%s", tileinfo[2]);
al_draw_textf(font[0], al_map_rgb(255, 255, 255), 520, 580, 0, "%s", tileinfo[3]);
}
al_draw_bitmap(bmp[0], mouse_x, mouse_y, 0);
al_flip_display();
}
}
if (gamemode == stdend)
{
al_rest(2);
al_destroy_display(disp.display);
}
return 0;
}
答案 0 :(得分：0)
您从未在循环之前初始化mouse_x和mouse_y。这意味着它们可以是任意随机值，但很可能它们是0.当你按一个键时，循环继续，你的鼠标光标在循环底部的（0,0）绘制。您可以使用al_get_mouse_state将其初始化为正确的值。