/**********************************************************************                SEGGER MICROCONTROLLER SYSTEME GmbH                 **        Solutions for real time microcontroller applications        ************************************************************************                                                                    **           (C) 1996    SEGGER Microcontroller Systeme GmbH          **                                                                    **        Internet: www.segger.com    Support:  support@segger.com    **                                                                    *************************************************************************** emWin/GSC Grafical user interface for embedded applications ****emWin is protected by international copyright laws. Knowledge of thesource code may not be used to write a similar product. This file mayonly be used in accordance with a license and should not be re-distributed in any way. We appreciate your understanding and fairness.----------------------------------------------------------------------File        : XEye_Sample.cPurpose     : Demonstrates the use of transparent windows----------------------------------------------------------------------*/#include <stddef.h>#include <math.h>#include "GUI.h"#include "FRAMEWIN.h"/***********************************************************************       defines************************************************************************/#define FACTOR   5#define EYE_X1  18#define EYE_X2  54#define EYE_Y   26#define EYE_RX  16#define EYE_RY  24#define MIN_VISIBILITY 50          /* Make sure at least this many pixels stay visible when moved *//***********************************************************************       static data************************************************************************//* None *//***********************************************************************       static code, helper functions************************************************************************//*********************************************************************       _Min*/static int _Min(int a, int b) {  return (a < b) ? a : b;}/*********************************************************************       _DrawEye*/static void _DrawEye(int x0, int y0, int rx, int ry, int x1, int y1) {  int dx, dy, x, y;  float Hyp;  GUI_SetColor(GUI_WHITE);  GUI_FillEllipse(x0, y0, rx, ry);  GUI_SetColor(GUI_BLACK);  GUI_DrawEllipse(x0, y0, rx, ry);  /* Calculate the coordinates */  dx  = x1 - x0 + 1;  dy  = y1 - y0 + 1;  Hyp = sqrt(dx * dx + dy * dy);  x   = (dx * _Min(rx - 5, abs(dx)) * FACTOR / Hyp) + x0 * FACTOR;  y   = (dy * _Min(ry - 5, abs(dy)) * FACTOR / Hyp) + y0 * FACTOR;  /* Draw the pupil */  GUI_AA_SetFactor(FACTOR);  GUI_AA_EnableHiRes();  GUI_SetColor(0xD00000);  GUI_AA_FillCircle(x, y, 5.75 * FACTOR);  GUI_SetColor(GUI_BLACK);  GUI_AA_FillCircle(x, y, 3.75 * FACTOR);  GUI_SetColor(GUI_GRAY);  GUI_AA_FillCircle(x - 1.25 * FACTOR, y - 1.25 * FACTOR, 1.25 * FACTOR);  GUI_AA_DisableHiRes();}/***********************************************************************       static code, callbacks************************************************************************//***********************************************************************       _cbTransWindow*/static void _cbTransWindow(WM_MESSAGE* pMsg) {  WM_HWIN hWin = pMsg->hWin;  GUI_PID_STATE State;  GUI_PID_GetState(&State);  switch (pMsg->MsgId) {  case WM_PAINT:    State.x -= WM_GetWindowOrgX(hWin);    State.y -= WM_GetWindowOrgY(hWin);    _DrawEye(EYE_X1, EYE_Y, EYE_RX, EYE_RY, State.x, State.y);    _DrawEye(EYE_X2, EYE_Y, EYE_RX, EYE_RY, State.x, State.y);    break;  case WM_TOUCH:    if (pMsg->Data.p) {      GUI_PID_STATE* pState = (GUI_PID_STATE*)pMsg->Data.p;      if (pState->Pressed) {        int mx, my, x;        I32 Sum, SumY;        I32 OutConst = EYE_RX * EYE_RX * EYE_RY * EYE_RY + (EYE_RX * EYE_RX * EYE_RY >> 1);        mx = pState->x;        my = (pState->y < EYE_Y) ? (EYE_Y - pState->y) : (pState->y - EYE_Y);        if (my >= 0 && my <= EYE_RY) {          int y;          x = EYE_RX;          for (y = 0; y <= my; y++) {            SumY =((I32)(EYE_RX * EYE_RX)) * ((I32)(y * y));            while (Sum = SumY + ((I32)(EYE_RY * EYE_RY)) * ((I32)(x * x)), (x > 0) && (Sum > OutConst)) {              x--;            }          }        } else {          x = -EYE_RX;        }        if (((mx >= EYE_X1 - x) && (mx <= EYE_X1 + x)) ||             ((mx >= EYE_X2 - x) && (mx <= EYE_X2 + x)) || WM_HasCaptured(hWin))        {          WM_SetCaptureMove(hWin, pState, MIN_VISIBILITY);        } else {          /* Transfer the message to the underlying window, since the transparent area has been clicked. */          WM_HWIN hBelow = WM_Screen2hWinEx(hWin, State.x, State.y);          if (hBelow) {            pState->x = State.x - WM_GetWindowOrgX(hBelow);            pState->y = State.y - WM_GetWindowOrgY(hBelow);            WM_SendMessage(hBelow, pMsg);          }        }      }    }    break;  default:    WM_DefaultProc(pMsg);  }}/*********************************************************************       _DemoTransWindow*/static void _DemoTransWindow(void) {  WM_HWIN hTransWin, hFrameWin;  WM_SetCreateFlags(WM_CF_MEMDEV);  WM_EnableMemdev(WM_HBKWIN);  WM_SetDesktopColor(GUI_RED);  hTransWin = WM_CreateWindow(10,  10, 72, 52, WM_CF_SHOW | WM_CF_HASTRANS | WM_CF_STAYONTOP,                              &_cbTransWindow, 0);  hFrameWin = FRAMEWIN_Create("Framewin", 0, WM_CF_SHOW, 100, 70, 120, 100);  FRAMEWIN_SetActive(hFrameWin, 1);  FRAMEWIN_SetMoveable(hFrameWin, 1);  GUI_CURSOR_Show();  while (1) {    WM_InvalidateWindow(hTransWin);    GUI_Delay(20);  }}/***********************************************************************       MainTask************************************************************************/void MainTask(void) {  GUI_Init();  _DemoTransWindow();}