painter.c

《嵌入式Linux应用开发详解》中的源代码

// $Id: painter.c,v 1.5 2002/07/28 04:28:10 ymwei Exp $
//
// A MiniGUI Painter
//
// Copyright (c) 2001, Wei Yongming ([e-mail])
//
// Create date: 2001/11/01

/*
**  This source is free software; you can redistribute it and/or
**  modify it under the terms of the GNU General Public
**  License as published by the Free Software Foundation; either
**  version 2 of the License, or (at your option) any later version.
**
**  This software is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
**  General Public License for more details.
**
**  You should have received a copy of the GNU General Public
**  License along with this library; if not, write to the Free
**  Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
**  MA 02111-1307, USA
*/

//
// Modify records:
//
//  Who             When        Where       For What                Status
//-----------------------------------------------------------------------------
//
// TODO:
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <math.h>

#include <minigui/common.h>
#include <minigui/minigui.h>
#include <minigui/gdi.h>
#include <minigui/window.h>
#include <minigui/control.h>

#ifndef _USE_NEWGAL
#error "***********************************************************************"
#error "** This program needs New GAL of MiniGUI!                            **"
#error "** Please run `./configure --enable-newgal' when configure MiniGUI,  **"
#error "** then build and reinstall MiniGUI.                                 **"
#error "***********************************************************************"
#else

#include <minigui/fixedmath.h>

#include "painter.h"

#define DEFAULT_WIDTH   800
#define DEFAULT_HEIGHT  600

static HMENU createpmenuabout (void)
{
    HMENU hmnu;
    MENUITEMINFO mii;
    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING;
    mii.id          = 0;
    mii.typedata    = (DWORD)"About...";
    hmnu = CreatePopupMenu (&mii);
    
    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING ;
    mii.state       = 0;
    mii.id          = IDM_ABOUT_THIS;
    mii.typedata    = (DWORD)"About MiniGUI Painter...";
    InsertMenuItem(hmnu, 0, TRUE, &mii);

    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING ;
    mii.state       = 0;
    mii.id          = IDM_ABOUT;
    mii.typedata    = (DWORD)"About MiniGUI...";
    InsertMenuItem(hmnu, 1, TRUE, &mii);

    return hmnu;
}

static HMENU createpmenufile (void)
{
    HMENU hmnu;
    MENUITEMINFO mii;
    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING;
    mii.id          = 0;
    mii.typedata    = (DWORD)"File";
    hmnu = CreatePopupMenu (&mii);
    
    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_NEW;
    mii.typedata    = (DWORD)"New";
    InsertMenuItem(hmnu, 0, TRUE, &mii);
    
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_OPEN;
    mii.typedata    = (DWORD)"Open...";
    InsertMenuItem(hmnu, 1, TRUE, &mii);
    
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_SAVE;
    mii.typedata    = (DWORD)"Save";
    InsertMenuItem(hmnu, 2, TRUE, &mii);
    
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_SAVEAS;
    mii.typedata    = (DWORD)"Save As...";
    InsertMenuItem(hmnu, 3, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_CLOSE;
    mii.typedata    = (DWORD)"Close";
    InsertMenuItem(hmnu, 4, TRUE, &mii);
    
    mii.type        = MFT_SEPARATOR;
    mii.state       = 0;
    mii.id          = 0;
    mii.typedata    = 0;
    InsertMenuItem(hmnu, 5, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_EXIT;
    mii.typedata    = (DWORD)"Exit";
    InsertMenuItem(hmnu, 6, TRUE, &mii);

    return hmnu;
}

static HMENU createpmenuedit (void)
{
    HMENU hmnu;
    MENUITEMINFO mii;
    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING;
    mii.id          = 0;
    mii.typedata    = (DWORD)"Edit";
    hmnu = CreatePopupMenu (&mii);
    
    mii.type        = MFT_STRING ;
    mii.state       = 0;
    mii.id          = IDM_COPY;
    mii.typedata    = (DWORD)"Copy Screen";
    InsertMenuItem(hmnu, 0, TRUE, &mii);
     
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_PASTE;
    mii.typedata    = (DWORD)"Paste";
    InsertMenuItem(hmnu, 1, TRUE, &mii);  
    
    return hmnu;
}

static HMENU createpmenuobject (void)
{
    HMENU hmnu;
    MENUITEMINFO mii;
    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING;
    mii.id          = 0;
    mii.typedata    = (DWORD)"Drawing Object";
    hmnu = CreatePopupMenu (&mii);
    
    mii.type        = MFT_STRING;
    mii.state       = MF_CHECKED;
    mii.id          = IDM_LINE;
    mii.typedata    = (DWORD)"Line";
    InsertMenuItem(hmnu, 0, TRUE, &mii);
     
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_ELLIPSE;
    mii.typedata    = (DWORD)"Circle/Ellipse";
    InsertMenuItem(hmnu, 1, TRUE, &mii);
     
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_RECT;
    mii.typedata    = (DWORD)"Rectangle";
    InsertMenuItem(hmnu, 2, TRUE, &mii);
     
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_ARC;
    mii.typedata    = (DWORD)"Arc";
    InsertMenuItem(hmnu, 3, TRUE, &mii);
     
    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_SPLINE;
    mii.typedata    = (DWORD)"Spline";
    InsertMenuItem(hmnu, 4, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_FILLED_RECT;
    mii.typedata    = (DWORD)"Filled Rectangle";
    InsertMenuItem(hmnu, 5, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_FILLED_ELLIPSE;
    mii.typedata    = (DWORD)"Filled Circle/Ellipse";
    InsertMenuItem(hmnu, 6, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_FILLED_POLYGON;
    mii.typedata    = (DWORD)"Filled Polygon";
    InsertMenuItem(hmnu, 7, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_FLOOD_FILL;
    mii.typedata    = (DWORD)"Flood Fill";
    InsertMenuItem(hmnu, 8, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.state       = 0;
    mii.id          = IDM_XU_POLYLINE;
    mii.typedata    = (DWORD)"xu polyline";
    InsertMenuItem(hmnu, 9, TRUE, &mii);

    return hmnu;
}

static HMENU createmenu (void)
{
    HMENU hmnu;
    MENUITEMINFO mii;

    hmnu = CreateMenu();

    memset (&mii, 0, sizeof(MENUITEMINFO));
    mii.type        = MFT_STRING;
    mii.id          = 100;
    mii.typedata    = (DWORD)"File";
    mii.hsubmenu    = createpmenufile ();

    InsertMenuItem(hmnu, 0, TRUE, &mii);

    mii.type        = MFT_STRING;
    mii.id          = 110;
    mii.typedata    = (DWORD)"Edit";
    mii.hsubmenu    = createpmenuedit ();
    InsertMenuItem(hmnu, 1, TRUE, &mii);
    
    mii.type        = MFT_STRING;
    mii.id          = 120;
    mii.typedata    = (DWORD)"Object";
    mii.hsubmenu    = createpmenuobject ();
    InsertMenuItem(hmnu, 2, TRUE, &mii);
    
    mii.type        = MFT_STRING;
    mii.id          = 130;
    mii.typedata    = (DWORD)"About";
    mii.hsubmenu    = createpmenuabout ();
    InsertMenuItem(hmnu, 3, TRUE, &mii);
                   
    return hmnu;
}

#define MAX_POINTS  40

static int obj_type = IDM_LINE;
static POINT pts [MAX_POINTS];
static int cur_pt = 0;
static int oldx = -1, oldy;
const POINT point[6]={{100,50},{71,141},{148,85},{52,85},{129,141},{100,50}};

static void DrawObject (HDC hdc)
{
    switch (obj_type) {
    case IDM_LINE:
        if (cur_pt == 2) {
            MoveTo (hdc, pts[0].x, pts[0].y);
            LineTo (hdc, pts[1].x, pts[1].y);
            cur_pt = 0; oldx = -1;
        }
        break;

    case IDM_ELLIPSE:
        if (cur_pt == 2) {
            int rx = ABS (pts[1].x - pts[0].x);
            int ry = ABS (pts[1].y - pts[0].y);

            if (rx == ry)
                Circle (hdc, pts[0].x, pts[0].y, rx);
            else
                Ellipse (hdc, pts[0].x, pts[0].y, rx, ry);
            cur_pt = 0; oldx = -1;
        }
        break;

    case IDM_RECT:
        if (cur_pt == 2) {
            Rectangle (hdc, pts[0].x, pts[0].y, pts[1].x, pts[1].y);
            cur_pt = 0; oldx = -1;
        }
        break;

    case IDM_ARC:
        if (cur_pt == 3) {
            int sx = pts [0].x, sy = pts [0].y;
            int dx = pts [1].x - sx, dy = pts [1].y - sy;
            int r = sqrt (dx * dx * 1.0 + dy * dy * 1.0);
            double cos_d = dx * 1.0 / r;
            fixed cos_f = ftofix (cos_d);
            fixed ang1 = facos (cos_f);
            int r2;
            fixed ang2;

            if (dy > 0) {
                ang1 = fsub (0, ang1);
            }

            dx = pts [2].x - sx;
            dy = pts [2].y - sy;
            r2 = sqrt (dx * dx * 1.0 + dy * dy * 1.0);