/*******************************************************************************
* Copyright (c) 2001-2005 Sasa Markovic and Ciaran Treanor.
* Copyright (c) 2011 The OpenNMS Group, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************************************/
package org.jrobin.graph;
class Mapper {
private RrdGraphDef gdef;
private ImageParameters im;
private double pixieX, pixieY;
Mapper(RrdGraph rrdGraph) {
this(rrdGraph.gdef, rrdGraph.im);
}
Mapper(RrdGraphDef gdef, ImageParameters im) {
this.gdef = gdef;
this.im = im;
pixieX = (double) im.xsize / (double) (im.end - im.start);
if (!gdef.logarithmic) {
pixieY = (double) im.ysize / (im.maxval - im.minval);
}
else {
pixieY = (double) im.ysize / (Math.log10(im.maxval) - Math.log10(im.minval));
}
}
int xtr(double mytime) {
return (int) ((double) im.xorigin + pixieX * (mytime - im.start));
}
int ytr(double value) {
double yval;
if (!gdef.logarithmic) {
yval = im.yorigin - pixieY * (value - im.minval) + 0.5;
}
else {
if (value < im.minval) {
yval = im.yorigin;
}
else {
yval = im.yorigin - pixieY * (Math.log10(value) - Math.log10(im.minval)) + 0.5;
}
}
if (!gdef.rigid) {
return (int) yval;
}
else if ((int) yval > im.yorigin) {
return im.yorigin + 2;
}
else if ((int) yval < im.yorigin - im.ysize) {
return im.yorigin - im.ysize - 2;
}
else {
return (int) yval;
}
}
}