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/* xxPixmapGraph Graph implemented as Pixmap.
Last modified 1999-08-14
Copyright (C) 1998 David Flater.
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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "xtide.hh"
xxPixmapGraph::xxPixmapGraph (unsigned xsize, unsigned ysize,
xxContext *in_context): Graph (xsize, ysize) {
assert (xsize >= mingwidth && ysize >= mingheight);
context = in_context;
pixmap = context->makePixmap (xsize, ysize);
}
xxPixmapGraph::~xxPixmapGraph() {
XFreePixmap (context->display, pixmap);
}
unsigned xxPixmapGraph::fontWidth() {
return 7;
}
unsigned xxPixmapGraph::fontHeight() {
// This used to be 11, then was increased to make room for Latin1
// characters.
return 12;
}
void xxPixmapGraph::setPixel (int x, int y, Colors::colorchoice c) {
if (x < 0 || x >= xsize() || y < 0 || y >= ysize())
return;
XSetForeground (context->display, context->spare_gc,
context->pixels[c]);
XDrawPoint (context->display, pixmap, context->spare_gc, x, y);
}
void xxPixmapGraph::setPixel (int x, int y, Colors::colorchoice c,
double saturation) {
if (x < 0 || x >= xsize() || y < 0 || y >= ysize())
return;
if (context->display_sucks) {
if (saturation >= 0.5)
setPixel (x, y, c);
} else {
unsigned short r1, g1, b1, r2, g2, b2;
// We arrive at this sorry crossroads as a result of these
// unhealthy facts about Xlib:
// 1. Apart from doing XGetImage, there is no way to "read"
// the value of a pixel in a Pixmap.
// 2. The drawing functions XDrawPoint, XDrawLine, and XDrawString
// only work on "drawables." Windows and Pixmaps are drawables;
// XImages are not. So it's not possible to avoid the kludge
// by using XImages instead of Pixmaps everywhere.
// It would be nice to just inherit everything from RGBGraph and then
// convert the PPM to a Pixmap at the end, but this suddenly gets
// complicated when your display only supports 256 colors. It's also
// intolerably slow. The only remaining alternative would be to
// duplicate the effort in RGBGraph to create an XImage at the PutPixel
// level, sans even XDrawLine to speed things up. This would probably
// be even slower than the current implementation (IMHO).
XImage *img = XGetImage (context->display, pixmap, x, y, 1, 1,
AllPlanes, ZPixmap);
Pixel pixel = XGetPixel (img, 0, 0);
XDestroyImage (img);
// Assuming that image has same colormap as display. (?) This
// could also be done using the color masks in the XImage.
context->extractColor (pixel, r1, g1, b1);
context->extractColor (context->pixels[c], r2, g2, b2);
XSetForeground (context->display, context->spare_gc,
context->getColor (linterp (r1, r2, saturation),
linterp (g1, g2, saturation),
linterp (b1, b2, saturation)));
XDrawPoint (context->display, pixmap, context->spare_gc, x, y);
}
}
void xxPixmapGraph::drawVerticalLine (int x, int y1, int y2,
Colors::colorchoice c) {
XSetForeground (context->display, context->spare_gc,
context->pixels[c]);
XDrawLine (context->display, pixmap, context->spare_gc, x, y1, x, y2);
}
void
xxPixmapGraph::drawHorizontalLine (int xlo, int xhi, int y,
Colors::colorchoice c) {
XSetForeground (context->display, context->spare_gc,
context->pixels[c]);
if (xlo <= xhi) // ?
XDrawLine (context->display, pixmap, context->spare_gc, xlo, y, xhi, y);
}
void
xxPixmapGraph::drawString (int x, int y, const Dstr &s) {
XDrawString (context->display, pixmap, context->text_gc, x, y+fontHeight()-2,
s.aschar(), s.length());
}
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