总是有不少怀旧的人喜欢老电话，老相机，比如我，每次看到老上海的电话机，老香港的手提砖头块，总是会产生一种奇怪的感觉。

老话机每一个格就是一个脉冲，拨1就一个格，拨9就9个格，也就是能听到咔咔声9次。每个对应位置就接通一次脉冲，错过位置就断了，

下一个格又是一个脉冲，0就是10个脉冲。

这里只是在MTK做一些小尝试，非完整代码，请勿模仿。

#define DIAL_X  (UI_device_width/2)
#define DIAL_Y  ((UI_device_height/2)+30)
#define DIAL_R  ((((UI_device_height>UI_device_width)?(UI_device_width/2):(UI_device_height/2))))
#define DIAL_IN_R  (20)
#define DIAL_COLOR  (GDI_COLOR_BLACK)
void my_gdi_draw_line(S32 x1, S32 y1, S32 x2, S32 y2, gdi_color line_color, S32 w)
{
mmi_pen_point_struct a[4];
S32 sinx;
S32 cosx;
S32 r;
S32 tmp;
tmp = sqrt(((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)));
sinx = (int)(((y2-y1)*1000/(int)tmp));
cosx = (int)(((x2-x1)*1000/(int)tmp));
if (w >2)
{
r  = w/2;
a[0].x = x1 + (int)((r*sinx)/1000);
a[0].y = y1 - (int)((r*cosx)/1000);
a[1].x = x2 + (int)(((((r%2)!=0)?(r+1):r)*sinx)/1000);
a[1].y = y2 - (int)(((((r%2)!=0)?(r+1):r)*cosx)/1000);
a[2].x = x2 - (int)(((((r%2)!=0)?(r+1):r)*sinx)/1000);
a[2].y = y2 + (int)(((((r%2)!=0)?(r+1):r)*cosx)/1000);
a[3].x = x1 - (int)((r*sinx)/1000);
a[3].y = y1 + (int)((r*cosx)/1000);
gdi_draw_solid_polygon(a,4,DIAL_COLOR);
}
else
{
color c;
c.r = (U8) ((0xFF000000 & line_color) >> 24);
c.g = (U8) ((0x00FF0000 & line_color) >> 16);
c.b = (U8) ((0x0000FF00 & line_color) >> 8);
c.alpha = (U8) ((0x000000FF & line_color));
gui_wline(x1, y1, x2, y2, c, w);
}
}
extern void my_gdi_draw_line(S32 x1, S32 y1, S32 x2, S32 y2, gdi_color line_color, S32 w);
extern void my_gui_draw_anm_dial(void);
void exit_myapp_screen(void)
{
if (buf_ptr != NULL)
{
med_free_ext_mem((void **)&buf_ptr);
}
if (my_layer2 != NULL)
{
gdi_layer_free(my_layer2);
}
InitDesktopScreen();
gui_cancel_timer(my_gui_draw_anm_dial);
//GoBackHistory();
}
void my_gui_draw_dial(U16 angle)
{
U8 i;
char *t[] = {L"0", L"1",L"2", L"3", L"4",L"5", L"6", L"7", L"8", L"9", L"*", L"#", L"←", L"A", L"B", L"C"};
gdi_draw_circle(DIAL_X,DIAL_Y,DIAL_R,DIAL_COLOR);
gdi_draw_circle(DIAL_X,DIAL_Y,(DIAL_R*618)/1000,DIAL_COLOR);
gdi_draw_point(DIAL_X,DIAL_Y,DIAL_COLOR);
gdi_draw_point(DIAL_X+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_cosine_table[angle],DIAL_Y+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_sine_table[angle],DIAL_COLOR);
for (i = 0; i < 16; i++)
{
gdi_draw_circle(DIAL_X+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_cosine_table[((i*22)+angle)>=360?(((i*22)+angle)-360):((i*22)+angle)],DIAL_Y+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_sine_table[((i*22)+angle)>=360?(((i*22)+angle)-360):((i*22)+angle)],(DIAL_R*100)/1000,DIAL_COLOR);
gui_move_text_cursor(DIAL_X+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_cosine_table[((i*22)+angle)>=360?(((i*22)+angle)-360):((i*22)+angle)]-5, DIAL_Y+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_sine_table[((i*22)+angle)>=360?(((i*22)+angle)-360):((i*22)+angle)]-5);
gui_print_text((UI_string_type)t[i]);
}
}
void my_gui_draw_anm_dial(void)
{
static U16 a = 0;
gdi_layer_get_base_handle(&my_base_layer);
gdi_layer_set_active(my_base_layer);
gdi_layer_clear(GDI_COLOR_TRANSPARENT);
my_gui_draw_dial(a);
//UI_start_timer(100, my_gui_draw_anm_dial);
gdi_layer_set_blt_layer(my_base_layer, my_layer2, NULL, NULL);
gdi_layer_blt_previous(0, 0, UI_device_width - 1, UI_device_height - 1);
a = a + 5;
if (a >= 360)
{
a = 0;
}
gui_start_timer(100, my_gui_draw_anm_dial);
}
void entry_myapp_screen(void)
{
U8 *gui_buffer;
BOOL isEnable;
gdi_color base_color;
mmi_pen_point_struct a[4];
U16 angle = 0;
U8 i;
ExitDesktopScreen();
//EntryNewScreen (MAIN_MENU_SCREENID,exit_myapp_screen,entry_myapp_screen, NULL);
//  gui_buffer = GetCurrGuiBuffer(MAIN_MENU_SCREENID);
entry_full_screen();
gdi_layer_clear(GDI_COLOR_TRANSPARENT);
gdi_layer_multi_layer_enable();
gdi_layer_create(0, 0, UI_device_width, UI_device_height, &my_layer2);
gdi_layer_set_active(my_layer2);
gdi_layer_clear_background(GDI_COLOR_TRANSPARENT);
gdi_layer_set_source_key(TRUE, GDI_COLOR_TRANSPARENT);
//draw handle
a[0].x = DIAL_X;
a[0].y = DIAL_Y;
a[2].x = DIAL_X + (int)(((DIAL_R*618)/1000)*g_qj_gui_clock_acm_cosine_table[angle]);
a[2].y = DIAL_Y + (int)(((DIAL_R*618)/1000)*g_qj_gui_clock_acm_sine_table[angle]);
a[1].x = DIAL_X + (int)(DIAL_IN_R*g_qj_gui_clock_acm_cosine_table[((angle-42)>0?(angle-42):(angle-42+360))]);
a[1].y = DIAL_Y + (int)(DIAL_IN_R*g_qj_gui_clock_acm_sine_table[((angle-42)>0?(angle-42):(angle-42+360))]);
a[3].x = DIAL_X + (int)(DIAL_IN_R*g_qj_gui_clock_acm_cosine_table[((angle+42)<360?(angle+42):(angle+42-360))]);
a[3].y = DIAL_Y + (int)(DIAL_IN_R*g_qj_gui_clock_acm_sine_table[((angle+42)<360?(angle+42):(angle+42-360))]);
gdi_draw_polygon(a,4,DIAL_COLOR);
gui_wline(a[0].x, a[0].y,a[2].x,a[2].y, UI_COLOR_GREEN,2);
gui_wline(a[1].x, a[1].y,a[3].x,a[3].y, UI_COLOR_GREEN,2);
//draw earphone
//gdi_draw_circle(DIAL_X,DIAL_Y,UI_device_height/2+20,DIAL_COLOR);
//my_gdi_draw_line(10, 20, 100, 50, DIAL_COLOR, 10);
gdi_layer_get_base_handle(&my_base_layer);
gdi_layer_set_active(my_base_layer);
//draw dial
#if 0
gdi_draw_circle(DIAL_X,DIAL_Y,DIAL_R,DIAL_COLOR);
gdi_draw_circle(DIAL_X,DIAL_Y,(DIAL_R*618)/1000,DIAL_COLOR);
gdi_draw_circle(DIAL_X,DIAL_Y,20,DIAL_COLOR);
gdi_draw_point(DIAL_X,DIAL_Y,DIAL_COLOR);
gdi_draw_point(DIAL_X+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_cosine_table[angle],DIAL_Y+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_sine_table[angle],DIAL_COLOR);
for (i = 0; i < 16; i++)
{
gdi_draw_circle(DIAL_X+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_cosine_table[(i*22)],DIAL_Y+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_sine_table[(i*22)],(DIAL_R*100)/1000,DIAL_COLOR);
gui_move_text_cursor(DIAL_X+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_cosine_table[(i*22)]-5, DIAL_Y+(int)((DIAL_R*809)/1000)*g_qj_gui_clock_acm_sine_table[(i*22)]-5);
gui_print_text((UI_string_type)t[i]);
}
#else
//gui_start_timer(100, my_gui_draw_anm_dial);
//my_gui_draw_dial(90);
my_gui_draw_anm_dial();
#endif
gdi_layer_set_blt_layer(my_base_layer, my_layer2, NULL, NULL);
gdi_layer_blt_previous(0, 0, UI_device_width - 1, UI_device_height - 1);
SetKeyHandler(exit_myapp_screen, KEY_RSK, KEY_EVENT_UP);
}

该文用到的三角形函数值数组请参阅拙作：

巧用数学函数生成函数表

http://blog.csdn.net/blogercn/archive/2011/03/28/6283278.aspx

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模仿老式拨盘电话机拨号原理拨号

巧用数学函数生成函数表

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