portapack-mayhem/firmware/common/ui.cpp

/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "ui.hpp"
#include "sine_table.hpp"
#include "utility.hpp"

#include <algorithm>

namespace ui {

// CGA palette
Color term_colors[16] = {
    Color::black(),
    Color::dark_blue(),
    Color::dark_green(),
    Color::dark_cyan(),
    Color::dark_red(),
    Color::dark_magenta(),
    Color::dark_yellow(),
    Color::light_grey(),
    Color::dark_grey(),
    Color::blue(),
    Color::green(),
    Color::cyan(),
    Color::red(),
    Color::magenta(),
    Color::yellow(),
    Color::white()};

bool Rect::contains(const Point p) const {
    return (p.x() >= left()) && (p.y() >= top()) &&
           (p.x() < right()) && (p.y() < bottom());
}

Rect Rect::intersect(const Rect& o) const {
    const auto x1 = std::max(left(), o.left());
    const auto x2 = std::min(right(), o.right());
    const auto y1 = std::max(top(), o.top());
    const auto y2 = std::min(bottom(), o.bottom());
    if ((x2 >= x1) && (y2 > y1)) {
        return {x1, y1, x2 - x1, y2 - y1};
    } else {
        return {};
    }
}

// TODO: This violates the principle of least surprise!
// This does a union, but that might not be obvious from "+=" syntax.
Rect& Rect::operator+=(const Rect& p) {
    if (is_empty()) {
        *this = p;
    }
    if (!p.is_empty()) {
        const auto x1 = std::min(left(), p.left());
        const auto y1 = std::min(top(), p.top());
        _pos = {x1, y1};
        const auto x2 = std::max(right(), p.right());
        const auto y2 = std::max(bottom(), p.bottom());
        _size = {x2 - x1, y2 - y1};
    }
    return *this;
}

Rect& Rect::operator+=(const Point& p) {
    _pos += p;
    return *this;
}

Rect& Rect::operator-=(const Point& p) {
    _pos -= p;
    return *this;
}

Point polar_to_point(float angle, uint32_t distance) {
    // polar to compass with y negated for screen drawing
    return Point(sin_f32(DEG_TO_RAD(-angle) + pi) * distance,
                 sin_f32(DEG_TO_RAD(-angle) - (pi / 2)) * distance);
}

Point fast_polar_to_point(int32_t angle, uint32_t distance) {
    // polar to compass with y negated for screen drawing
    return Point((int16_sin_s4(((1 << 16) * (-angle + 180)) / 360) * distance) / (1 << 16),
                 (int16_sin_s4(((1 << 16) * (-angle - 90)) / 360) * distance) / (1 << 16));
}

} /* namespace ui */