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This thread is locked; no one can reply to it.
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| Rotating square with mouse |
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AleX-G Squadron
Member #13,593
October 2011
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I wanted to ask, how can i make a square rotate in base of event.mouse.x The square is al_draw_rectangle(x-15,y-15,x+15,y+15,al_map_rgb(0,0,255),3.0); Is there any way to do that? The square cannot move with mouse, only with keyboard. www.anothergames.com |
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SiegeLord
Member #7,827
October 2006
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Your question is a bit incomplete... let me use my A5 mind reading addon and guess what you actually want. You can do that using transformations: ALLEGRO_TRANSFORM trans; al_identity_transform(&trans); al_translate_transform(&trans, -cx, -cy); //cx,cy are set to the mouse coordinates in the mouse event al_rotate_transform(&trans, theta); al_translate_transform(&trans, cx, cy); al_use_transform(&trans); al_draw_rectangle(x - 15, y - 15, x + 15, y + 15, al_map_rgb(0, 0, 255), 3.0); /* Reset transform */ al_identity_transform(&trans); al_use_transform(&trans);
"For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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AleX-G Squadron
Member #13,593
October 2011
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Your code works perfect. But i need to rotate the square. www.anothergames.com |
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Edgar Reynaldo
Major Reynaldo
May 2007
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Sorry, what? You need to be clearer. What I gather so far : double theta_radians = atan2(event.mouse.y - square_center_y , event.mouse.x - square_center_x); Then use a transform to center on the center of the square, then add in a rotate transform to rotate by theta_radians, then draw the square. My Website! | EAGLE GUI Library Demos | My Deviant Art Gallery | Spiraloid Preview | A4 FontMaker | Skyline! (Missile Defense) Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide |
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AleX-G Squadron
Member #13,593
October 2011
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I have used the AMCerasoli video of networking, because it is clearer.  Also, the code of siege worked, but the center was not the square, but the top left corner of the screen. How to change the center? www.anothergames.com |
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SiegeLord
Member #7,827
October 2006
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How about this: ALLEGRO_TRANSFORM trans; al_identity_transform(&trans); al_rotate_transform(&trans, theta); al_translate_transform(&trans, x, y); al_use_transform(&trans); al_draw_rectangle(-15, -15, 15, 15, al_map_rgb(0, 0, 255), 3.0); /* Reset transform */ al_identity_transform(&trans); al_use_transform(&trans); You'd compute the theta using the formula Edgar posted. "For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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AleX-G Squadron
Member #13,593
October 2011
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Same thing again, it just moved a little Who in the world understands this from the manual "Apply a translation to a transformation." Also, i tried scale transform and it didnt work at all with the mouse. atan2 is wrong in my configuration after including math.h which wasnt even mentioned to use: www.anothergames.com |
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SiegeLord
Member #7,827
October 2006
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AleX-G Squadron said: Same thing again, it just moved a little Then you're doing something wrong, as this example shows that it works fine: 1#include <stdio.h>
2#include <allegro5/allegro.h>
3#include <allegro5/allegro_primitives.h>
4#include <math.h>
5int main()
6{
7 al_init();
8 ALLEGRO_DISPLAY* d = al_create_display(800, 600);
9 al_init_primitives_addon();
10 al_install_mouse();
11 al_install_keyboard();
12 ALLEGRO_TIMER* t = al_create_timer(1.0 / 60);
13 ALLEGRO_EVENT_QUEUE* q = al_create_event_queue();
14 al_register_event_source(q, al_get_mouse_event_source());
15 al_register_event_source(q, al_get_keyboard_event_source());
16 al_register_event_source(q, al_get_timer_event_source(t));
17
18 int x = 200;
19 int y = 200;
20 int vx = 0;
21 int vy = 0;
22 int mx = 0;
23 int my = 0;
24 float theta = 0;
25
26 al_start_timer(t);
27 bool quit = false;
28 bool redraw = true;
29 while(!quit)
30 {
31 ALLEGRO_EVENT e;
32 al_wait_for_event(q, &e);
33 switch(e.type)
34 {
35 case ALLEGRO_EVENT_MOUSE_AXES:
36 mx = e.mouse.x;
37 my = e.mouse.y;
38 break;
39 case ALLEGRO_EVENT_KEY_DOWN:
40 switch(e.keyboard.keycode)
41 {
42 case ALLEGRO_KEY_ESCAPE:
43 quit = true;
44 break;
45 case ALLEGRO_KEY_RIGHT:
46 vx += 1;
47 break;
48 case ALLEGRO_KEY_LEFT:
49 vx -= 1;
50 break;
51 case ALLEGRO_KEY_UP:
52 vy -= 1;
53 break;
54 case ALLEGRO_KEY_DOWN:
55 vy += 1;
56 break;
57 }
58 break;
59 case ALLEGRO_EVENT_KEY_UP:
60 switch(e.keyboard.keycode)
61 {
62 case ALLEGRO_KEY_RIGHT:
63 vx -= 1;
64 break;
65 case ALLEGRO_KEY_LEFT:
66 vx += 1;
67 break;
68 case ALLEGRO_KEY_UP:
69 vy += 1;
70 break;
71 case ALLEGRO_KEY_DOWN:
72 vy -= 1;
73 break;
74 }
75 break;
76 case ALLEGRO_EVENT_TIMER:
77 x += vx;
78 y += vy;
79 theta = atan2(my - y, mx - x);
80 redraw = true;
81 break;
82 }
83
84 if(al_is_event_queue_empty(q) && redraw)
85 {
86 al_clear_to_color(al_map_rgb_f(0, 0, 0));
87
88 ALLEGRO_TRANSFORM trans;
89 al_identity_transform(&trans);
90 al_rotate_transform(&trans, theta);
91 al_translate_transform(&trans, x, y);
92 al_use_transform(&trans);
93 al_draw_rectangle(-15, -15, 15, 15, al_map_rgb(0, 0, 255), 3.0);
94 /* Reset transform */
95 al_identity_transform(&trans);
96 al_use_transform(&trans);
97
98 al_flip_display();
99 }
100 }
101
102 return 0;
103}
"For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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AleX-G Squadron
Member #13,593
October 2011
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atan2 doesnt work. I dont know why. I am using visual studio 2012 www.anothergames.com |
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Arthur Kalliokoski
Second in Command
February 2005
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Are you linking with math.lib? They all watch too much MSNBC... they get ideas. |
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AleX-G Squadron
Member #13,593
October 2011
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I added the math.lib in the Linker -> General -> Additional Library Dependencies Used this path Then i tried this other one Still the same www.anothergames.com |
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CodeStepper
Member #14,495
August 2012
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theta = atan2(my - y, mx - x);
I have the same problem theta = atan2((float)(my - y), (float)(mx - x));
Theta in this case must be float AleX-G Squadron said: I am using visual studio 2012
o.O And I think, that this is better way to do rotate something: 1#include <allegro5/allegro.h>
2#include <allegro5/allegro_primitives.h>
3#include <allegro5/allegro_font.h>
4#include <allegro5/allegro_ttf.h>
5#include <math.h>
6
7int main( void )
8{
9 // Inicjalizacja bibliotek
10 al_init( );
11 al_init_primitives_addon( );
12 al_init_font_addon( );
13 al_init_ttf_addon( );
14
15 // Instalowanie kontrolerów
16 al_install_mouse( );
17 al_install_keyboard( );
18 al_install_joystick( );
19
20 // Zmienne allegro
21 ALLEGRO_DISPLAY *display = al_create_display( 800, 600 );
22 ALLEGRO_EVENT_QUEUE *queue = al_create_event_queue( );
23 ALLEGRO_TIMER *timer = al_create_timer( 1.0 / 60 );
24
25 // Rejestrowanie zdarzeń
26 al_register_event_source( queue, al_get_keyboard_event_source( ) );
27 al_register_event_source( queue, al_get_mouse_event_source( ) );
28 al_register_event_source( queue, al_get_joystick_event_source( ) );
29 al_register_event_source( queue, al_get_display_event_source( display ) );
30 al_register_event_source( queue, al_get_timer_event_source( timer ) );
31
32///////////////////////////////////////////////////////////////////////////////
33 // CREATE BITMAP
34///////////////////////////////////////////////////////////////////////////////
35 ALLEGRO_BITMAP *bitmap = al_create_bitmap( 40, 40 );
36 al_set_target_bitmap( bitmap );
37 al_clear_to_color( al_map_rgb( 60, 80, 100 ) );
38 al_set_target_bitmap( al_get_backbuffer( display ) );
39
40 bool run = true;
41 bool render = true;
42
43 bool keys[4] = { false, false, false, false };
44
45 int posx = 40;
46 int posy = 40;
47 float theta = 0;
48
49 al_start_timer( timer );
50 while( run )
51 {
52 ALLEGRO_EVENT event;
53 al_wait_for_event( queue, &event );
54
55 switch( event.type )
56 {
57 case ALLEGRO_EVENT_DISPLAY_CLOSE:
58
59 run = false;
60
61 break;
62 case ALLEGRO_EVENT_TIMER:
63
64 render = true;
65
66 break;
67 case ALLEGRO_EVENT_KEY_DOWN:
68
69 switch( event.keyboard.keycode )
70 {
71 case ALLEGRO_KEY_UP:
72 keys[0] = true;
73 break;
74 case ALLEGRO_KEY_DOWN:
75 keys[1] = true;
76 break;
77 case ALLEGRO_KEY_LEFT:
78 keys[2] = true;
79 break;
80 case ALLEGRO_KEY_RIGHT:
81 keys[3] = true;
82 break;
83 }
84
85 break;
86 case ALLEGRO_EVENT_KEY_UP:
87
88 switch( event.keyboard.keycode )
89 {
90 case ALLEGRO_KEY_UP:
91 keys[0] = false;
92 break;
93 case ALLEGRO_KEY_DOWN:
94 keys[1] = false;
95 break;
96 case ALLEGRO_KEY_LEFT:
97 keys[2] = false;
98 break;
99 case ALLEGRO_KEY_RIGHT:
100 keys[3] = false;
101 break;
102 case ALLEGRO_KEY_ESCAPE:
103 run = false;
104 break;
105 }
106
107 break;
108 case ALLEGRO_EVENT_MOUSE_AXES:
109 theta = atan2( (float)(event.mouse.y - posy + 10), (float)(event.mouse.x - posx + 10) );
110 break;
111 }
112
113 if( render && al_is_event_queue_empty( queue ) )
114 {
115 render = false;
116 al_clear_to_color( al_map_rgb( 250, 250, 250 ) );
117
118 if( keys[0] ) posy -= 3;
119 else if( keys[1] ) posy += 3;
120 if( keys[2] ) posx -= 3;
121 else if( keys[3] ) posx += 3;
122
123///////////////////////////////////////////////////////////////////////////////
124 // ROTATE BITMAP
125///////////////////////////////////////////////////////////////////////////////
126 al_draw_rotated_bitmap( bitmap, 20, 20, posx, posy, theta, 0 );
127
128 al_flip_display( );
129 }
130 }
131
132 // Destruktory
133 al_destroy_display ( display );
134 al_destroy_event_queue ( queue );
135 al_destroy_timer ( timer );
136 al_destroy_bitmap ( bitmap );
137
138 return 0;
139}
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SiegeLord
Member #7,827
October 2006
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CodeStepper said: Theta in this case must be float There is no integer version of atan2, that's just nonsensical. What does this code print? #include <iostream> #include <typeinfo> #include <math.h> int main() { std::cout << typeid(atan2((int)0, int(0))).name() << std::endl; return 0; }
Quote: And I think, that this is better way to do rotate something: My way is better for primitives and in fact works for all drawables, while your way only works for bitmaps. "For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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CodeStepper
Member #14,495
August 2012
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Oh... but there is double, long dobule and float atan2 version! In fact, you can create bitmap from all drawable primitives and then rotate it While I compile your code, there is error:
error C2668: 'atan2' : ambiguous call to overloaded function
c:\program files\microsoft visual studio 9.0\vc\include\math.h(547): could be 'long double atan2(long double,long double)'
c:\program files\microsoft visual studio 9.0\vc\include\math.h(499): or 'float atan2(float,float)'
c:\program files\microsoft visual studio 9.0\vc\include\math.h(110): or 'double atan2(double,double)'
while trying to match the argument list '(int, int)'
I must do cast to float. Sory, but my previous words are logical |
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SiegeLord
Member #7,827
October 2006
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CodeStepper said: In fact, you can create bitmap from all drawable primitives and then rotate it Inefficient and unnecessary. Quote: While I compile your code, there is error: Well a compile error makes sense. It compiling without error and then not functioning does not. Either way, the original code is C not C++ "For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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CodeStepper
Member #14,495
August 2012
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But if you using bitmaps in this case, application works better |
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SiegeLord
Member #7,827
October 2006
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CodeStepper said: But if you using bitmaps in this case, application works better If you only need to rotate a single pre-existing bitmap, then yeah... no need for transformations. "For in much wisdom is much grief: and he that increases knowledge increases sorrow."-Ecclesiastes 1:18 |
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AMCerasoli
Member #11,955
May 2010
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Well, I'm currently not using transformations at all...
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AleX-G Squadron
Member #13,593
October 2011
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@codestepper Visual Studio 2012 is the same as 2010, with some changes and it has intellisense. I dont get it why it is a bad thing to do it like that, because it works 100% Also, if anyone can make a pacman which opens its mouth using the al_draw_pieslice that would be great as i was trying to do it today without any success. @cerasoli www.anothergames.com |
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CodeStepper
Member #14,495
August 2012
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Hmm... i think i don't make any bugs in comments Sorry for variable names - some of them don't reflect their roles So, code for pac-man primitives version with comments: 1#include <stdio.h>
2#include <allegro5/allegro.h>
3#include <allegro5/allegro_primitives.h>
4#include <math.h>
5#include <iostream>
6int main()
7{
8 const float framesPerSecond = 60; /////////////////// frames
9
10 al_init();
11 ALLEGRO_DISPLAY* d = al_create_display(800, 600);
12 al_init_primitives_addon();
13 al_install_mouse();
14 al_install_keyboard();
15 ALLEGRO_TIMER* t = al_create_timer(1.0 / framesPerSecond);
16 ALLEGRO_EVENT_QUEUE* q = al_create_event_queue();
17 al_register_event_source(q, al_get_mouse_event_source());
18 al_register_event_source(q, al_get_keyboard_event_source());
19 al_register_event_source(q, al_get_timer_event_source(t));
20
21 int x = 200; // position x
22 int y = 200; // position y
23 int vx = 0; // velocity x
24 int vy = 0; // velocity y
25 int mx = 0; // mouse x
26 int my = 0; // mouse y
27 float theta = 0; // theta ( atan2 )
28
29 // Maximum radius ( 360 degress in radians ) - half is 3.14159, ( so, half it's PI )
30 const float maxDelta = 6.28318;
31 // Minimum radius ( minimum radius of slice ( maxDelta - minDelta is real radius of slice ) )
32 const float minDelta = 5.0;
33
34 // Automatic variables
35 float deltaFrame = ( maxDelta - minDelta ) / framesPerSecond; // value of delta adding in every frame per second
36 float currDelta = maxDelta; // start theta in
37 float currDelta2 = minDelta; // delta_theta
38 float halfDelta = ( maxDelta - minDelta ) / 2; // half of
39
40 // Decide, (TRUE) if currDelta is increasing and currDelta2 decreasing or vice versa (FALSE)
41 bool growing = false;
42
43 al_start_timer(t);
44 bool quit = false;
45 bool redraw = true;
46 while(!quit)
47 {
48 ALLEGRO_EVENT e;
49 al_wait_for_event(q, &e);
50 switch(e.type)
51 {
52 case ALLEGRO_EVENT_MOUSE_AXES:
53 mx = e.mouse.x;
54 my = e.mouse.y;
55 break;
56 case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
57 al_rest( 1 );
58 break;
59 case ALLEGRO_EVENT_KEY_DOWN:
60 switch(e.keyboard.keycode)
61 {
62 case ALLEGRO_KEY_ESCAPE:
63 quit = true;
64 break;
65 case ALLEGRO_KEY_RIGHT:
66 vx += 1;
67 break;
68 case ALLEGRO_KEY_LEFT:
69 vx -= 1;
70 break;
71 case ALLEGRO_KEY_UP:
72 vy -= 1;
73 break;
74 case ALLEGRO_KEY_DOWN:
75 vy += 1;
76 break;
77 }
78 break;
79 case ALLEGRO_EVENT_KEY_UP:
80 switch(e.keyboard.keycode)
81 {
82 case ALLEGRO_KEY_RIGHT:
83 vx -= 1;
84 break;
85 case ALLEGRO_KEY_LEFT:
86 vx += 1;
87 break;
88 case ALLEGRO_KEY_UP:
89 vy += 1;
90 break;
91 case ALLEGRO_KEY_DOWN:
92 vy -= 1;
93 break;
94 }
95 break;
96 case ALLEGRO_EVENT_TIMER:
97 x += vx;
98 y += vy;
99 theta = atan2((float)(my - y), (float)(mx - x));
100 redraw = true;
101 break;
102 }
103
104 if(al_is_event_queue_empty(q) && redraw)
105 {
106 al_clear_to_color(al_map_rgb_f(0, 0, 0));
107
108 // Transformation
109 ALLEGRO_TRANSFORM trans;
110 al_identity_transform(&trans); // creating transformation
111 al_rotate_transform(&trans, theta); // rotating display
112 al_translate_transform(&trans, x, y); // moving transformation ( display )
113 al_use_transform(&trans); // using transformation
114
115 // Drawing pieslice
116 al_draw_pieslice( 0, 0, 20, currDelta + halfDelta, currDelta2, al_map_rgb( 255, 0, 0 ), 2 );
117
118 /* Reset transform */
119 al_identity_transform(&trans);
120 al_use_transform(&trans);
121
122 // Checking radius
123 if( currDelta >= maxDelta ) growing = false;
124 else if( currDelta <= minDelta + halfDelta ) growing = true;
125
126 // Decreasing or increasing
127 // In case variable currDelta2, value is multipled * 2, that the top line was moving
128 if( growing ) currDelta += deltaFrame, currDelta2 -= deltaFrame * 2;
129 else currDelta -= deltaFrame, currDelta2 += deltaFrame * 2;
130
131 al_flip_display();
132 }
133 }
134
135 al_destroy_display( d );
136 al_destroy_event_queue( q );
137 al_destroy_timer( t );
138 return 0;
139}
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AleX-G Squadron
Member #13,593
October 2011
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Wow, you are amazing! www.anothergames.com |
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CodeStepper
Member #14,495
August 2012
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I forgot about this: redraw = false; Paste this before: al_clear_to_color(al_map_rgb_f(0, 0, 0));
And it will run better |
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