模仿老式拨盘电话机拨号原理拨号

 

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 handlea[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 0gdi_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();    #endifgdi_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