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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/stream.h"
#include "common/rect.h"
#include "adl/display.h"
#include "adl/graphics.h"
namespace Adl {
// Draws a four-connected line
void GraphicsMan::drawLine(const Common::Point &p1, const Common::Point &p2, byte color) const {
int16 deltaX = p2.x - p1.x;
int8 xStep = 1;
if (deltaX < 0) {
deltaX = -deltaX;
xStep = -1;
}
int16 deltaY = p2.y - p1.y;
int8 yStep = -1;
if (deltaY > 0) {
deltaY = -deltaY;
yStep = 1;
}
Common::Point p(p1);
int16 steps = deltaX - deltaY + 1;
int16 err = deltaX + deltaY;
while (true) {
_display.putPixel(p, color);
if (--steps == 0)
return;
if (err < 0) {
p.y += yStep;
err += deltaX;
} else {
p.x += xStep;
err += deltaY;
}
}
}
} // End of namespace Adl
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