aa_hiresantialiasing.c

ucgui源码3.32

/*
*********************************************************************************************************
*                                                uC/GUI
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : AA_HiResAntialiasing.c
Purpose     : Demonstrates high resolution antialiasing
----------------------------------------------------------------------
*/

#include "GUI.H"

/*******************************************************************
*
*       defines
*
********************************************************************
*/

#define countof(Obj) (sizeof(Obj)/sizeof(Obj[0]))

/*******************************************************************
*
*       static variables
*
********************************************************************
*/

static const GUI_POINT _aPointer[] = {
  { 0,  3},
  {85,  1},
  {90,  0},
  {85, -1},
  { 0, -3}
};

static GUI_POINT _aPointerHiRes[countof(_aPointer)];

typedef struct {
  GUI_AUTODEV_INFO AutoInfo;
  GUI_POINT aPoints[countof(_aPointer)];
  int Factor;
} PARAM;

/*******************************************************************
*
*       static functions
*
********************************************************************
*/

/*******************************************************************
*
*       _DrawHiRes

  This function draws the high resolution pointer
*/
static void _DrawHiRes(void * p) {
  PARAM * pParam = (PARAM *)p;
  if (pParam->AutoInfo.DrawFixed) {
    GUI_ClearRect(60, 60, 99, 99);
  }
  GUI_AA_FillPolygon(pParam->aPoints, 
                     countof(_aPointer), 
                     65  * pParam->Factor, 
                     155 * pParam->Factor);
}

/*******************************************************************
*
*       _Draw

  This function draws the non high resolution pointer
*/
static void _Draw(void * p) {
  PARAM * pParam = (PARAM *)p;
  if (pParam->AutoInfo.DrawFixed) {
    GUI_ClearRect(160, 60, 199, 99);
  }
  GUI_AA_FillPolygon(pParam->aPoints, countof(_aPointer), 165, 155);
}

/*******************************************************************
*
*       _ShowHiresAntialiasing

  This function creates the memory auto devices and handle the
  rotation of the pointers
*/
static void _ShowHiresAntialiasing(void) {
  int i;
  GUI_AUTODEV aAuto[2];
  PARAM Param;
  Param.Factor = 3;
  GUI_SetBkColor(GUI_BLACK);
  GUI_Clear();
  GUI_SetColor(GUI_WHITE);
  GUI_SetTextAlign(GUI_TA_HCENTER);
  GUI_SetFont(&GUI_Font24_ASCII);
  GUI_DispStringAt("HiResAntialiasing - Sample", 160, 5);
  GUI_SetFont(&GUI_Font6x8);
  GUI_DispStringHCenterAt("Using\nhigh\nresolution\nmode", 110, 180);
  GUI_DispStringHCenterAt("Not using\nhigh\nresolution\nmode", 210, 180);
  /* Create GUI_AUTODEV objects */
  for (i = 0; i < countof(aAuto); i++) {
    GUI_MEMDEV_CreateAuto(&aAuto[i]);
  }
  /* Calculate pointer for high resolution */
  for (i = 0; i < countof(_aPointer); i++) {
    _aPointerHiRes[i].x = _aPointer[i].x * Param.Factor;
    _aPointerHiRes[i].y = _aPointer[i].y * Param.Factor;
  }
  GUI_AA_SetFactor(Param.Factor); /* Set antialiasing factor */
  while(1) {
    for (i = 0; i < 1800; i++) {
      float Angle = (i >= 900) ? 1800 - i : i;
      Angle *= 3.1415926f / 1800;
      /* Draw pointer with high resolution */
      GUI_AA_EnableHiRes();
      GUI_RotatePolygon(Param.aPoints, _aPointerHiRes, countof(_aPointer), Angle);
      GUI_MEMDEV_DrawAuto(&aAuto[0], &Param.AutoInfo, _DrawHiRes, &Param);
      /* Draw pointer without high resolution */
      GUI_AA_DisableHiRes();
      GUI_RotatePolygon(Param.aPoints, _aPointer, countof(_aPointer), Angle);
      GUI_MEMDEV_DrawAuto(&aAuto[1], &Param.AutoInfo, _Draw, &Param);
      GUI_Delay(2);
    }
  }
}

/*******************************************************************
*
*       MainTask
*
*       Demonstrate high resolution by drawing rotating pointers
*
********************************************************************
*/

void MainTask(void) {
  GUI_Init();
  _ShowHiresAntialiasing();
}