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https://github.com/libretro/scummvm.git
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70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/stream.h"
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#include "common/rect.h"
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#include "adl/display.h"
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#include "adl/graphics.h"
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namespace Adl {
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// Draws a four-connected line
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void GraphicsMan::drawLine(const Common::Point &p1, const Common::Point &p2, byte color) const {
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int16 deltaX = p2.x - p1.x;
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int8 xStep = 1;
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if (deltaX < 0) {
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deltaX = -deltaX;
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xStep = -1;
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}
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int16 deltaY = p2.y - p1.y;
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int8 yStep = -1;
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if (deltaY > 0) {
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deltaY = -deltaY;
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yStep = 1;
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}
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Common::Point p(p1);
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int16 steps = deltaX - deltaY + 1;
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int16 err = deltaX + deltaY;
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while (true) {
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_display.putPixel(p, color);
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if (--steps == 0)
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return;
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if (err < 0) {
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p.y += yStep;
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err += deltaX;
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} else {
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p.x += xStep;
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err += deltaY;
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}
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}
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}
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} // End of namespace Adl
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