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//===============================================================
// vMemoryDC - a memory drawing canvas
//
// Copyright (C) 1995,1996 Bruce E. Wampler
//
// This file is part of the V C++ GUI Framework, and is covered
// under the terms of the GNU Library General Public License,
// Version 2. This library has NO WARRANTY. See the source file
// vapp.cxx for more complete information about license terms.
//===============================================================
#include <v/vmemdc.h>
#include <v/vapp.h>
//================>>> vMemoryDC::vMemoryDC <<<========================
vMemoryDC::vMemoryDC(int width, int height)
{
XColor fg;
XColor bg;
_physHeight = height; // V 1.15a
_physWidth = width;
SysDebug(Constructor,"vMemoryDC::vMemoryDC() constructor\n")
_GC = _XorGC = 0;
_GCFont =
_font = theApp->GetDefaultFont(); // get the default font
_XDisplay = theApp->display();
if (_physWidth == 0)
_physWidth = theApp->DefaultWidth();
if (_physHeight == 0)
_physHeight = theApp->DefaultHeight();
// Create the Pixmap to draw into
_pixmap = XCreatePixmap(_XDisplay, theApp->xWindow(),
_physWidth, _physHeight, theApp->Xdepth());
if (_pixmap == 0)
return;
_GC = makeGC(); // make a normal GC to use
_XorGC = makeXorGC(); // make a GC to use
_pen.SetPenToPixel(_canvasFG);
_brush.SetBrushToPixel(_canvasFG);
SetPen(_pen);
SetBrush(_brush);
}
//================>>> vMemoryDC::~vMemoryDC <<<========================
vMemoryDC::~vMemoryDC()
{
SysDebug(Destructor,"vMemoryDC::~vMemoryDC() destructor\n")
if (_XorGC) // Free the GCs
XFreeGC(_XDisplay, _XorGC);
if (_GC)
XFreeGC(_XDisplay, _GC);
if (_pixmap != 0)
XFreePixmap(_XDisplay, _pixmap); // free the pixmap
}
//=====================>>> vMemoryDC::GetDrawable <<<======================
Drawable vMemoryDC::GetDrawable()
{
return (Drawable) _pixmap;
}
//=====================>>> vMemoryDC::Clear <<<==========================
void vMemoryDC::Clear(void)
{
// Clear by setting to background color
XSetForeground(_XDisplay, _GC, _canvasBG);
XFillRectangle(_XDisplay, _pixmap, _GC, 0,0, _physWidth, _physHeight);
}
//=====================>>> vMemoryDC::makeGC <<<=========================
GC vMemoryDC::makeGC()
{
// This one gets a default GC to used for the base canvas
GC gc; // local copy
XGCValues values; // to setup values
Pixel fg, bg;
int n = 0;
// set colors according to type of canvas
_canvasFG = theApp->Xfg();
_canvasBG = theApp->Xbg();
values.line_style = LineSolid; // only solid lines for now
values.line_width = 1; // width 1
values.fill_style = FillSolid;
values.function = GXcopy;
values.foreground = _canvasFG;
values.background = _canvasBG;
// This not a shared GC for memory canvases.
gc = XCreateGC(_XDisplay, GetDrawable(),
GCForeground | GCBackground | GCFunction | GCLineStyle |
GCLineWidth | GCFillStyle ,
&values);
// set the font
// Be sure the font is loaded
_font.LoadFont();
XSetFont(theApp->display(), gc, _font.GetXFont()->fid);
return gc;
}
//=====================>>> vMemoryDC::makeXorGC <<<==========================
GC vMemoryDC::makeXorGC()
{
// This one gets a default GC to used for the base canvas
GC gc; // local copy
XGCValues values; // to setup values
int n = 0;
// set colors according to type of canvas
values.line_width = 1; // width 1
values.function = GXxor;
if (_canvasFG == 0)
values.foreground = ~0; // force black
else
values.foreground = _canvasFG;
// This not a shared GC for memory canvases.
gc = XCreateGC(_XDisplay, GetDrawable(),
GCForeground | GCFunction | GCLineWidth,
&values);
return gc;
}
//================>>> vMemoryDC::SetBackground <<<==========================
void vMemoryDC::SetBackground(vColor& color)
{
vXDC::SetBackground(color);
}
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