objects.h

/* 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 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 <http://www.gnu.org/licenses/>.
 *
 */


#ifndef TEENAGENT_OBJECTS_H
#define TEENAGENT_OBJECTS_H

#include "common/rect.h"
#include "graphics/surface.h"

#include "teenagent/teenagent.h"

namespace TeenAgent {

enum {kActorUp = 1, kActorRight = 2, kActorDown = 3, kActorLeft = 4 };

struct Rect {
    int16 left, top, right, bottom;

    inline Rect() : left(0), top(0), right(0), bottom(0), _base(NULL) {}
    inline Rect(const Common::Rect &r) : left(r.left), top(r.top), right(r.right), bottom(r.bottom), _base(NULL) {}
    inline Rect(uint16 l, uint16 t, uint16 r, uint16 b) : left(l), top(t), right(r), bottom(b), _base(NULL) {}

    inline bool in(const Common::Point &point) const {
        return point.x >= left && point.x <= right && point.y >= top && point.y <= bottom;
    }

    inline Common::Point center() const {
        return Common::Point((right + left) / 2, (bottom + top) / 2);
    }

    inline bool valid() const {
        return left >= 0 && left < kScreenWidth && right >= 0 && right < kScreenWidth && top >= 0 && top < kScreenHeight && bottom >= 0 && bottom < kScreenHeight;
    }

    void render(Graphics::Surface *surface, uint8 color) const;

    void dump(int level = 0) const {
        debugC(level, kDebugObject, "rect[%u, %u, %u, %u]", left, top, right, bottom);
    }

    inline void clear() {
        left = top = right = bottom = 0;
    }

    void load(byte *src); //8 bytes
    void save() const;

    inline bool intersects_hline(int x1, int x2, int y) const {
        if (x1 > x2)
            SWAP(x1, x2);
        return y >= top && y <= bottom && x1 <= right && x2 >= left;
    }

    inline bool intersects_vline(int x, int y1, int y2) const {
        if (y1 > y2)
            SWAP(y1, y2);
        return x >= left && x <= right && y1 <= bottom && y2 >= top;
    }

    inline bool contains(const Rect &rect) const {
        return rect.left >= left && rect.right <= right && rect.top >= top && rect.bottom <= bottom;
    }

    static inline bool inside(int x, int a, int b) {
        if (a > b)
            SWAP(a, b);
        return x >= a && x <= b;
    }

    int intersects_line(const Common::Point &a, const Common::Point &b) const {
        int dy = b.y - a.y, dx = b.x - a.x;

        int mask = 0; //orientation bitmask: 1 - top, 2 - right, 3 - bottom, 4 - left

        if (dx != 0) {
            int yl = (left - a.x) * dy / dx + a.y;
            if (yl > top && yl < bottom && inside(yl, a.y, b.y) && inside(left, a.x, b.x)) {
                //c[idx++] = Common::Point(left, yl);
                mask |= 8;
            }
            int yr = (right - a.x) * dy / dx + a.y;
            if (yr > top && yr < bottom && inside(yr, a.y, b.y) && inside(right, a.x, b.x)) {
                //c[idx++] = Common::Point(right, yr);
                mask |= 2;
            }
        }

        if (dy != 0) {
            int xt = (top - a.y) * dx / dy + a.x;
            if (xt > left && xt < right && inside(xt, a.x, b.x) && inside(top, a.y, b.y)) {
                //assert(idx < 2);
                //c[idx++] = Common::Point(xt, top);
                mask |= 1;
            }
            int xb = (bottom - a.y) * dx / dy + a.x;
            if (xb > left && xb < right && inside(xb, a.x, b.x) && inside(bottom, a.y, b.y)) {
                //assert(idx < 2);
                //c[idx++] = Common::Point(xb, bottom);
                mask |= 4;
            }
        }
        return mask;
    }

    void side(Common::Point &p1, Common::Point &p2, int o, const Common::Point &nearest) const {
        switch (o) {
        case kActorLeft:
            p1 = Common::Point(left, top);
            p2 = Common::Point(left, bottom);
            break;

        case kActorRight:
            p1 = Common::Point(right, top);
            p2 = Common::Point(right, bottom);
            break;

        case kActorUp:
            p1 = Common::Point(left, top);
            p2 = Common::Point(right, top);
            break;

        case kActorDown:
            p1 = Common::Point(left, bottom);
            p2 = Common::Point(right, bottom);
            break;

        default:
            p1 = Common::Point();
            p2 = Common::Point();
        }
        if (p1.sqrDist(nearest) >= p2.sqrDist(nearest))
            SWAP(p1, p2);
    }

protected:
    byte *_base;
};

struct Object {
    byte id; //0
    Rect rect; //1
    Rect actorRect; //9
    byte actorOrientation; //17
    byte enabled; //18
    //19
    Common::String name, description;

    Object(): _base(NULL), _nameSize(0) { id = 0; actorOrientation = 0; enabled = 0;  }
    void dump(int level = 0) const;
    void setName(const Common::String &newName);
    void load(byte *addr);
    void save() const;

    static Common::String parseDescription(const char *desc);

protected:
    byte *_base;
    size_t _nameSize;
};

struct InventoryObject {
    byte id;
    byte animated;
    Common::String name, description;

    InventoryObject(): id(0), animated(0), _base(0) {}
    void load(byte *addr);

protected:
    byte *_base;
};

struct UseHotspot {
    byte inventoryId;
    byte objectId;
    byte orientation;
    uint16 actorX, actorY;
    uint16 callback;
    void load(byte *src);
    void dump(int level = 0) const;
};

struct Walkbox {
    byte type;
    byte orientation;
    Rect rect;
    byte sideHint[4];

    Walkbox() {
        _base = nullptr;
        type = 0;
        orientation = 0;
        // rect cleared by Rect constructor
        for (uint i = 0; i < ARRAYSIZE(sideHint); i++) {
            sideHint[i] = 0;
        }
    }
    void dump(int level = 0) const;
    void load(byte *src);
    void save() const;

protected:
    byte *_base;
};

struct FadeType {
    Rect rect;
    byte value;

    void load(byte *src);
};

//\todo move it to util.h?
template<typename T> inline T SIGN(T x) { return (x > 0) ? 1 : ((x < 0) ? -1 : 0); }

} // End of namespace TeenAgent

#endif