mouse won't appear

mouse won't appear

vlad417

Member #8,720

June 2007

so the mouse pointer will not appear, i dont know how to get it to show up inside the window. the program works just fine, i just want the mouse to appear (if possible could i get a crosshair mouse?) IDE:Code::Blocks Compiler: GNU GPP

1#include <allegro.h>
2using namespace std;
3 
4int x[2] = {-1,-1};
5int y[2] = {-1,-1};
6int count=1;
7int blue = makecol(0,0,255);
8 
9void reset(){
10    x[0] = -1;
11    x[1] = -1;
12    y[0] = -1;
13    y[1] = -1;
14}
15 
16void solidDraw(){
17    if(count == 1){
18        x[0]=mouse_x;
19        y[0]=mouse_y;
20        count++;
21        //break;
22    }
23    else if(count == 2){
24        x[1]=mouse_x;
25        y[1]=mouse_y;
26        count--;
27        //break;
28    }
29    if(x[0]!=-1 && x[1]!=-1 && y[0]!=-1 && y[1]!=-1){
30        line(screen,x[0],y[0],x[1],y[1],blue);
31    }
32}
33 
34void dotDraw(){
35    putpixel(screen,mouse_x,mouse_y, blue);
36}
37 
38int main(){
39    allegro_init();
40    install_keyboard();
41    install_timer();
42    install_mouse();
43    show_mouse(screen);
44 
45 
46 
47    set_color_depth(32);
48    set_gfx_mode(GFX_AUTODETECT_WINDOWED,800,640,0,0);
49    clear_to_color(screen,makecol(255,255,255));
50 
51    do{
52        if(mouse_b & 1){solidDraw();}
53    }while(!key[KEY_ESC]);
54 
55    allegro_exit();
56}
57END_OF_MAIN();

Kris Asick

Member #1,424

July 2001

You have to call show_mouse() after you set the video mode, not before. This is because at the moment you currently call show_mouse() the screen pointer is NULL.

--- Kris Asick (Gemini)
--- http://www.pixelships.com

Rampage

Member #3,035

December 2002

[edit]

What he said.

Besides, you must hide the mouse pointer before doing any drawing. Use scare_mouse and unscare_mouse() to achieve this:

    install_mouse();

    set_color_depth(32);
    set_gfx_mode(GFX_AUTODETECT_WINDOWED,800,640,0,0);
    clear_to_color(screen,makecol(255,255,255));
    show_mouse(screen);

    do{
        scare_mouse();
        if(mouse_b & 1){solidDraw();}
        unscare_mouse();
    }while(!key[KEY_ESC]);

    allegro_exit();

-R

vlad417

Member #8,720

June 2007

thx guys