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//=======================================================================
// mycanvas.cxx -- myCanvasPane class defintion
// Copyright (C) 1995 Bruce E. Wampler
//
// This program is part of the V C++ GUI Framework example programs.
//
// This program 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 program 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
// (see COPYING) along with this program; if not, write to the Free
// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//=======================================================================
#include "mycanvas.h"
//===================>>> myCanvasPane::myCanvasPane <<<====================
myCanvasPane::myCanvasPane()
{
_mouseDown = 0;
_begx = -1;
_begy = -1;
_curx = -1;
_cury = -1;
pt = new point[200]; // 200 lines
nextpt = 0;
}
//===================>>> myCanvasPane::myCanvasPane <<<====================
myCanvasPane::~myCanvasPane()
{
delete [] pt; // Zap the point array
}
//======================>>> myCanvasPane::Clear <<<========================
void myCanvasPane::Clear()
{
point *np;
vCanvasPane::Clear();
nextpt = 0;
}
//======================>>> myCanvasPane::HPage <<<========================
void myCanvasPane::HPage(int shown, int top)
{
vCanvasPane::HPage(shown, top);
}
//======================>>> myCanvasPane::VPage <<<========================
void myCanvasPane::VPage(int shown, int top)
{
vCanvasPane::VPage(shown, top);
}
//=======================>>> myCanvasPane::HScroll <<<======================
void myCanvasPane::HScroll(int step)
{
vCanvasPane::HScroll(step);
}
//======================>>> myCanvasPane::VScroll <<<======================
void myCanvasPane::VScroll(int step)
{
vCanvasPane::VScroll(step);
}
//======================>>> myCanvasPane::MouseDown <<<======================
void myCanvasPane::MouseDown(int X, int Y, int button)
{
_mouseDown = 1;
_begx = _curx = X;
_begy = _cury = Y;
pt[nextpt].x = X;
pt[nextpt].y = Y;
pt[nextpt].pPen = GetPen();
++nextpt;
if (nextpt >= 200) // really dumb!
nextpt = 0;
}
//========================>>> myCanvasPane::MouseUp <<<======================
void myCanvasPane::MouseUp(int X, int Y, int button)
{
_mouseDown = 0;
if (_begx != X || _begy != Y)
{
DrawLine(_begx, _begy, X, Y);
}
pt[nextpt].x = X;
pt[nextpt].y = Y;
pt[nextpt].pPen = GetPen();
++nextpt;
if (nextpt >= 200) // really dumb!
nextpt = 0;
_mouseDown = 0;
_begx = -1;
_begy = -1;
_curx = -1;
_cury = -1;
}
//======================>>> myCanvasPane::MouseMove <<<======================
void myCanvasPane::MouseMove(int x, int y, int button)
{
if (_begx != _curx || _begy != _cury)
{
DrawRubberLine(_begx, _begy, _curx, _cury); // erase old one
}
if (_begx != x || _begy != y)
{
DrawRubberLine(_begx, _begy, x, y);
}
_curx = x;
_cury = y;
}
//=========================>>> myCanvasPane::Redraw <<<======================
void myCanvasPane::Redraw(int x, int y, int w, int h)
{
// This is a stupid Redraw that just redraws everything.
// It also starts losing things after 200 points. This
// is just sample code, remember!
int x1, y1, x2, y2;
for (int i = 0 ; i < nextpt ; i += 2)
{
if (i == 0 || pt[i].pPen != pt[i-2].pPen)
SetPen(pt[i].pPen);
x1 = pt[i].x;
y1 = pt[i].y;
x2 = pt[i+1].x;
y2 = pt[i+1].y;
int xlim = x + w;
int ylim = y + h;
DrawLine(x1, y1, x2, y2);
}
}
//======================>>> myCanvasPane::Resize <<<======================
void myCanvasPane::Resize(int w, int h)
{
vCanvasPane::Resize(w,h);
}
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