TS_RA2_Mission_Editor_sourcecode_23.02.2023_1

TS_RA2_Mission_Editor_sourcecode_23.02.2023_1

MissionEditor/LineDrawer.cpp

@@ -0,0 +1,148 @@
+/*
+	FinalSun/FinalAlert 2 Mission Editor
+
+	Copyright (C) 1999-2024 Electronic Arts, Inc.
+	Authored by Matthias Wagner
+
+	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 3 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, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "StdAfx.h"
+#include "LineDrawer.h"
+#include <cassert>
+#include <memory>
+
+static int ModLookup[] = {
+	1,
+	2,
+	3,
+	4
+};
+
+LineDrawer::LineDrawer(void* dest, int bytes_per_pixel, int width, int height, int pitch):
+	m_dest(dest),
+	m_bytes_per_pixel(bytes_per_pixel),
+	m_width(width),
+	m_height(height),
+	m_pitch(pitch),
+	m_last_x(0),
+	m_last_y(0)
+{
+}
+
+void LineDrawer::MoveTo(int to_x, int to_y)
+{
+	m_last_x = to_x;
+	m_last_y = to_y;
+}
+
+void LineDrawer::LineTo(int to_x, int to_y, int color, LineStyle style)
+{
+	DrawLine(m_last_x, m_last_y, to_x, to_y, color, style);
+}
+
+void LineDrawer::DrawLine(int from_x, int from_y, int to_x, int to_y, int color, LineStyle style)
+{
+	const int w = to_x - from_x;
+	const int h = to_y - from_y;
+	m_last_x = to_x;
+	m_last_y = to_y;
+	if (abs(w) >= abs(h)) {
+		return w >= 0 ? DrawLineImplX(from_x, from_y, to_x, to_y, color, style) : DrawLineImplX(to_x, to_y, from_x, from_y, color, style);
+	}
+	else {
+		return h >= 0 ? DrawLineImplY(from_x, from_y, to_x, to_y, color, style) : DrawLineImplY(to_x, to_y, from_x, from_y, color, style);
+	}
+}
+
+void LineDrawer::Rectangle(int from_x, int from_y, int to_x, int to_y, int color, LineStyle style)
+{
+	MoveTo(from_x, from_y);
+	LineTo(to_x, from_y, color, style);
+	LineTo(to_x, to_y, color, style);
+	LineTo(from_x, to_y, color, style);
+	LineTo(from_x, from_y, color, style);
+}
+
+void LineDrawer::SetPixel(char* const dest, const int cur_x, const int cur_y, const int color)
+{
+	if (cur_x >= 0 && cur_y >= 0 && cur_x < m_width && cur_y < m_height)
+		memcpy(&dest[cur_x * m_bytes_per_pixel + cur_y * m_pitch], &color, m_bytes_per_pixel);
+}
+
+void LineDrawer::DrawLineImplX(const int from_x, const int from_y, const int to_x, const int to_y, const int color, const LineStyle style)
+{
+    // X major line drawing
+
+	assert (from_x <= to_x);
+	const int w = to_x - from_x;
+	const int h = abs(to_y - from_y);
+	assert (w >= h);
+	const int increment_e = 2 * h;
+	const int increment_ne = 2 * (h - w);
+	const int y_inc = (to_y - from_y) < 0 ? -1 : 1;
+	int d = 2 * h - w;
+	int cur_x = from_x;
+	int cur_y = from_y;
+	const int mod = ModLookup[static_cast<int>(style)];
+
+	char* dest = reinterpret_cast<char*>(m_dest);
+	SetPixel(dest, cur_x, cur_y, color);
+
+	for(; cur_x < to_x; ++cur_x)
+	{
+		if (d < 0) {
+			d += increment_e;
+		}
+		else {
+			d += increment_ne;
+			cur_y += y_inc;
+		}
+		if (mod == 1 || (cur_x - from_x) % mod == 0)
+			SetPixel(dest, cur_x, cur_y, color);
+	}
+}
+
+void LineDrawer::DrawLineImplY(const int from_x, const int from_y, const int to_x, const int to_y, const int color, LineStyle style)
+{
+	// Y major line drawing
+
+	assert(from_y <= to_y);
+	const int w = abs(to_x - from_x);
+	const int h = to_y - from_y;
+	assert(h >= w);
+	const int increment_e = 2 * w;
+	const int increment_ne = 2 * (w - h);
+	const int x_inc = (to_x - from_x) < 0 ? -1 : 1;
+	int d = 2 * w - h;
+	int cur_x = from_x;
+	int cur_y = from_y;
+	const int mod = ModLookup[static_cast<int>(style)];
+
+	char* dest = reinterpret_cast<char*>(m_dest);
+	SetPixel(dest, cur_x, cur_y, color);
+
+	for (; cur_y < to_y; ++cur_y)
+	{
+		if (d < 0) {
+			d += increment_e;
+		}
+		else {
+			d += increment_ne;
+			cur_x += x_inc;
+		}
+		if (mod == 1 || (cur_y - from_y) % mod == 0)
+			SetPixel(dest, cur_x, cur_y, color);
+	}
+}