aa_hiresantialiasing.c

uc/GUI的应用实例

/*
*********************************************************************************************************
*                                                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"

/*******************************************************************
*
*            Data
*
********************************************************************
*/

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

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;

/*******************************************************************
*
*                 Drawing routines
*
********************************************************************
*/

static void DrawHiRes(void * p) {
  PARAM * pParam = (PARAM *)p;
  if (pParam->AutoInfo.DrawFixed) {
    GUI_ClearRect(0, 0, 99, 99);
  }
  GUI_AA_FillPolygon(pParam->aPoints, 
                     countof(aPointer), 
                     5 * pParam->Factor, 
                     95 * pParam->Factor);
}

static void Draw(void * p) {
  PARAM * pParam = (PARAM *)p;
  if (pParam->AutoInfo.DrawFixed) {
    GUI_ClearRect(100, 0, 199, 99);
  }
  GUI_AA_FillPolygon(pParam->aPoints, countof(aPointer), 105, 95);
}

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

static void ShowHiresAntialiasing(void) {
  int i;
  GUI_AUTODEV aAuto[2];
  PARAM Param;
  Param.Factor = 3;
  GUI_DispStringHCenterAt("Using\nhigh\nresolution\nmode", 50, 120);
  GUI_DispStringHCenterAt("Not using\nhigh\nresolution\nmode", 150, 120);
  /* 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);
    }
  }
}

/*******************************************************************
*
*                 main
*
********************************************************************
*/

void main(void) {
  GUI_Init();
  ShowHiresAntialiasing();
}