src/library/grid/src/just.c

/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 2001-3 Paul Murrell
 *                2003 The R Core Team
 *
 *  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 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, a copy is available at
 *  https://www.R-project.org/Licenses/
 */

#include "grid.h"

/* Modify a location for the correct justification */

/* These tranformations assume that x and width are in the same units */
/* FIXME:  I don't think we check anywhere that a horizontal justification
 * is not L_BOTTOM or L_TOP (i.e., meaningless).  Ditto for checking
 * vertical justification.
 */
double justifyX(double x, double width, double hjust) {
    return x - width*hjust;
    /*
     * From when hjust and vjust were enums
     *
    double result = 0;
    switch (hjust) {
    case L_LEFT: 
	result = x;
	break;        
    case L_RIGHT: 
	result = x - width;
	break;
    case L_CENTRE: 
    case L_CENTER:
	result = x - width/2;
	break;
    }
    return result;
    */
}

double justifyY(double y, double height, double vjust) {
    return y - height*vjust;
    /*
     * From when hjust and vjust were enums
     *
    double result = 0;
    switch (vjust) {
    case L_BOTTOM:  
	result = y;
	break;
    case L_TOP:  
	result = y - height;
	break;
    case L_CENTRE:
    case L_CENTER:
	result = y - height/2;
	break;
    }
    return result;
    */
}

/* Convert enum justification into 0..1 justification */
double convertJust(int just) {
    double result = 0;
    switch (just) {
    case L_BOTTOM:
    case L_LEFT:
	result = 0;
	break;
    case L_CENTRE:
    case L_CENTER:
	result = .5;
	break;
    case L_TOP:
    case L_RIGHT:
	result = 1;
	break;
    }
    return result;
}

/* Return the amount of justification required 
 */
void justification(double width, double height, double hjust, double vjust,
		   double *hadj, double *vadj)
{
    *hadj = -width*hjust;
    *vadj = -height*vjust;
    /*
     * From when hjust and vjust were enums
    switch (hjust) {
    case L_LEFT: 
	*hadj = 0;
	break;        
    case L_RIGHT: 
	*hadj = -width;
	break;
    case L_CENTRE: 
    case L_CENTER:
	*hadj = -width/2;
	break;
    }
    switch (vjust) {
    case L_BOTTOM:  
	*vadj = 0;
	break;
    case L_TOP:  
	*vadj = -height;
	break;
    case L_CENTRE:
    case L_CENTER:
	*vadj = -height/2;
	break;
    }
     */
}