Scroll subtitle (MTK)

# Define rolling_text_len XXXX // The total length of the rolling subtitle. This can be a constant, which depends on the screen.

# Define rolling_text_x XXXX // The Position of the starting subtitle of the rolling subtitle, the position of the first word

Parameters:

Rolling_text_y: Y coordinate of the rolling subtitle

Rolling_text_ptr: Rolling subtitle content

Text_bg_x: X coordinate of the rolling subtitle background

Text_bg_y: Y coordinate of the rolling subtitle background

Text_bg_len: Specifies the background length of a rolling subtitle.

Text_bg_height: the height of the background of the rolling subtitle.

These are all variables and can be set as global variables. Because these variables change every time you change a line to display different subtitles.

Void draw_rolling_text (s32 rolling_text_y, 2010* rolling_text_ptr, s32 text_bg_x, s32 text_bg_y, s32 text_bg_len, s32 text_bg_height)

{

Int I = rolling_text_start_num;

Color white_color ={ 255,255,255,100 };

Int word_nums = 0;

Static int rolling_text_start_num = 0;

Int total_width = 0;

Char rolling_text_start_num_return_0 = false;

2010* show_text = NULL;

For (word_nums = 0; total_width <rolling_text_len; word_nums ++, I ++) // calculates the size of show_text.

{

If (0x0000 = rolling_text_ptr [I])

{

Rolling_text_start_num_return_0 = true;

Total_width = rolling_text_len;

}

Else

Total_width + = gui_get_character_width (rolling_text_ptr [I]);

}

Show_text = popo_sys_malloc (word_nums + 1) * sizeof (002 ));

I = 0;

While (I <word_nums) & (rolling_text_ptr [rolling_text_start_num]! = 0x0000 ))

Show_text [I ++] = rolling_text_ptr [rolling_text_start_num ++];

Show_text [I] = 0x0000;

If (true = rolling_text_start_num_return_0)

Rolling_text_start_num = 0;

Else

Rolling_text_start_num ++;

 

Gui_set_text_color (white_color );

Gui_lock_double_buffer ();

Gui_move_text_cursor (rolling_text_x, rolling_text_y );

Gui_set_font (& mmi_medium_font );

******************* ***/

Gui_fill_rectangle (rolling_text_x, text_bg_y,

Rolling_text_x + text_bg_len,

Text_bg_y + text_bg_height );

******************* ***/

Gui_print_text (show_text );

Gui_unlock_double_buffer ();

Gui_blt_double_buffer (rolling_text_x, text_bg_y,

Rolling_text_x + text_bg_len,

Text_bg_y + text_bg_height );

Popo_sys_free (show_text );

 

}

As long as you run this program in a timer, it will have a dynamic rolling effect.