/*
 * Copyright (c) 1987, 1988, 1989 Stanford University
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Stanford not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  Stanford makes no representations about
 * the suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * STANFORD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
 * IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Rubberbanding rectangles.
 */

#include <InterViews/painter.h>
#include <InterViews/rubrect.h>
#include <math.h>

RubberRect::RubberRect (
    Painter* p, Canvas* c, Coord x0, Coord y0, Coord x1, Coord y1,
    Coord offx, Coord offy
) : (p, c, offx, offy) {
    fixedx = x0;
    fixedy = y0;
    movingx = x1;
    movingy = y1;
    trackx = x1;
    tracky = y1;
}

void RubberRect::GetOriginal (Coord& x0, Coord& y0, Coord& x1, Coord& y1) {
    x0 = fixedx;
    y0 = fixedy;
    x1 = movingx;
    y1 = movingy;
}

void RubberRect::GetCurrent (Coord& x0, Coord& y0, Coord& x1, Coord& y1) {
    x0 = fixedx;
    y0 = fixedy;
    x1 = trackx;
    y1 = tracky;
}

void RubberRect::Draw () {
    Coord x0, y0, x1, y1;

    if (!drawn) {
	GetCurrent(x0, y0, x1, y1);
	if (x0 == x1 || y0 == y1) {
	    output->Line(canvas, x0+offx, y0+offy, x1+offx, y1+offy);
	} else {
            output->Rect(canvas, x0+offx, y0+offy, x1+offx, y1+offy);
	}
	drawn = true;
    }
}

RubberSquare::RubberSquare (
    Painter* p, Canvas* c, Coord x0, Coord y0, Coord x1, Coord y1,
    Coord offx, Coord offy
) : (p, c, x0, y0, x1, y1, offx, offy) {
}

void RubberSquare::GetCurrent (Coord& x0, Coord& y0, Coord& x1, Coord& y1) {
    x0 = fixedx;
    y0 = fixedy;
    Coord dx = abs(trackx - x0);
    Coord dy = abs(tracky - y0);
    if (dx > dy) {
	x1 = trackx;
	y1 = (tracky > y0) ? y0 + dx : y0 - dx;
    } else {
	x1 = (trackx > x0) ? x0 + dy : x0 - dy;
	y1 = tracky;
    }
}

SlidingRect::SlidingRect (
    Painter* p, Canvas* c, Coord x0, Coord y0, Coord x1, Coord y1,
    Coord rfx, Coord rfy, Coord offx, Coord offy
) : (p, c, x0, y0, x1, y1, offx, offy) {
    refx = rfx;
    refy = rfy;
    trackx = rfx;
    tracky = rfy;
}

void SlidingRect::GetCurrent (Coord& x0, Coord& y0, Coord& x1, Coord& y1) {
    Coord dx, dy;

    dx = trackx - refx;
    dy = tracky - refy;
    x0 = fixedx + dx;
    y0 = fixedy + dy;
    x1 = movingx + dx;
    y1 = movingy + dy;
}


StretchingRect::StretchingRect (
    Painter* p, Canvas* c, Coord x0, Coord y0, Coord x1, Coord y1, Side s,
    Coord offx, Coord offy
) : (p, c, x0, y0, x1, y1, offx, offy) {
    side = s;
}

void StretchingRect::GetCurrent (Coord& x0, Coord& y0, Coord& x1, Coord& y1) {
    x0 = fixedx;
    y0 = fixedy;
    x1 = movingx;
    y1 = movingy;
    switch (side) {
        case LeftSide:
	    x0 = trackx;
	    break;
	case RightSide:
	    x1 = trackx;
	    break;
	case BottomSide:
	    y0 = tracky;
	    break;
	case TopSide:
	    y1 = tracky;
	    break;
    }
}

float StretchingRect::CurrentStretching () {
    Coord l, b, r, t;
    GetOriginal(l, b, r, t);
    Coord nl, nb, nr, nt;
    GetCurrent(nl, nb, nr, nt);

    float nsz = 0;
    float osz = 0;
    switch (side) {
    case LeftSide:
    case RightSide:
	nsz = nr - nl + 1;
	osz = r - l + 1;
	break;
    case BottomSide:
    case TopSide:
	nsz = nt - nb + 1;
	osz = t - b + 1;
	break;
    }

    if (osz == 0) {
	return MAXFLOAT;
    } else {
	return nsz / osz;
    }
}

ScalingRect::ScalingRect (
    Painter* p, Canvas* c, Coord x0, Coord y0, Coord x1, Coord y1,
    Coord cx, Coord cy, Coord offx, Coord offy
) : (p, c, x0, y0, x1, y1, offx, offy) {
    centerx = cx;
    centery = cy;
    width = abs(x0 - x1);
    height = abs(y0 - y1);
}

void ScalingRect::GetCurrent (Coord& x0, Coord& y0, Coord& x1, Coord& y1) {
    double factor = CurrentScaling();

    x0 = round(double(fixedx - centerx) * factor) + centerx;
    y0 = round(double(fixedy - centery) * factor) + centery;
    x1 = round(double(movingx - centerx) * factor) + centerx;
    y1 = round(double(movingy - centery) * factor) + centery;
}

float ScalingRect::CurrentScaling () {
    Coord dx, dy;
    double factor = 1;
    
    dx = abs(trackx - centerx);
    dy = abs(tracky - centery);
    if (width != 0 && dx > dy) {
        factor = double(2 * dx) / double(width);
    } else if (height != 0) {
        factor = double(2 * dy) / double(height);
    }
    return factor;
}

void RotatingRect::Transform (
    Coord& x, Coord& y,
    double a0, double a1, double b0, double b1, double c0, double c1
) {
    double tx, ty;

    tx = double(x);
    ty = double(y);
    
    x = round(a0*tx + b0*ty + c0);
    y = round(a1*tx + b1*ty + c1);
}

RotatingRect::RotatingRect (
    Painter* p, Canvas* c, Coord x0, Coord y0, Coord x1, Coord y1, 
    Coord cx, Coord cy, Coord rfx, Coord rfy, Coord offx, Coord offy
) : (p, c, offx, offy) {
    left = x0;
    bottom = y0;
    right = x1;
    top = y1;
    centerx = cx;
    centery = cy;
    refx = rfx;
    refy = rfy;
}

void RotatingRect::GetOriginal (Coord& x0, Coord& y0, Coord& x1, Coord& y1) {
    x0 = left;
    y0 = bottom;
    x1 = right;
    y1 = top;
}

void RotatingRect::GetCurrent (
    Coord& leftbotx, Coord& leftboty, Coord& rightbotx, Coord& rightboty,
    Coord& righttopx, Coord& righttopy, Coord& lefttopx, Coord& lefttopy
) {
    double sin, cos, hprod, dx1, dy1, dx2, dy2;
    
    leftbotx = lefttopx = left - centerx;
    leftboty = rightboty = bottom - centery;
    rightbotx = righttopx = right - centerx;
    lefttopy = righttopy = top - centery;

    dx1 = double(refx - centerx);
    dy1 = double(refy - centery);
    dx2 = double(trackx - centerx);
    dy2 = double(tracky - centery);
    hprod = sqrt((dx1*dx1 + dy1*dy1) * (dx2*dx2 + dy2*dy2));
    if (hprod != 0.0) {
        cos = (dx1*dx2 + dy1*dy2) / hprod;
        sin = (dx1*dy2 - dx2*dy1) / hprod;
        Transform(leftbotx, leftboty, cos, sin, -sin, cos, 0.0, 0.0);
        Transform(rightbotx, rightboty, cos, sin, -sin, cos, 0.0, 0.0);
        Transform(righttopx, righttopy, cos, sin, -sin, cos, 0.0, 0.0);
        Transform(lefttopx, lefttopy, cos, sin, -sin, cos, 0.0, 0.0);
    }
    leftbotx += centerx;
    leftboty += centery;
    rightbotx += centerx;
    rightboty += centery;
    righttopx += centerx;
    righttopy += centery;
    lefttopx += centerx;
    lefttopy += centery;
}

float RotatingRect::CurrentAngle () {
    Coord x0, y0, x1, y1, dummy;

    GetCurrent(x0, y0, x1, y1, dummy, dummy, dummy, dummy);
    return Angle(x0, y0, x1, y1);
}

void RotatingRect::Draw () {
    Coord x[5], y[5];

    if (!drawn) {
	GetCurrent(x[0], y[0], x[1], y[1], x[2], y[2], x[3], y[3]);
	if ((x[0] == x[1] && y[1] != y[2]) || (y[0] == y[1] && x[1] != x[2]) ||
	    (x[1] == x[2] && y[1] == y[2])
	) {
	    output->Line(canvas, x[0]+offx, y[0]+offy, x[2]+offx, y[2]+offy);
	} else {
	    for (int i = 0; i < 4; ++i) {
	        x[i] += offx;
		y[i] += offy;
	    }
	    x[4] = x[0];
	    y[4] = y[0];
	    output->MultiLine(canvas, x, y, 5);
	}
	drawn = true;
    }

}