Source Code Cross Referenced for Axis.java in  » Chart » charting-0.94 » de » progra » charting » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » charting 0.94 » de.progra.charting 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:            JOpenChart Java Charting Library and Toolkit
003:            Copyright (C) 2001  Sebastian Müller
004:            http://jopenchart.sourceforge.net
005:
006:            This library is free software; you can redistribute it and/or
007:            modify it under the terms of the GNU Lesser General Public
008:            License as published by the Free Software Foundation; either
009:            version 2.1 of the License, or (at your option) any later version.
010:
011:            This library is distributed in the hope that it will be useful,
012:            but WITHOUT ANY WARRANTY; without even the implied warranty of
013:            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:            Lesser General Public License for more details.
015:
016:            You should have received a copy of the GNU Lesser General Public
017:            License along with this library; if not, write to the Free Software
018:            Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019:
020:            Axis.java
021:            Created on 30. Juni 2001, 22:27
022:         */
023:
024:        package de.progra.charting;
025:
026:        import de.progra.charting.model.ChartDataModelConstraints;
027:
028:        /**
029:         * The CoordSystem contains two or possibly three Axis objects for the x-axis
030:         * and the at most two y-axis.
031:         * @author mueller
032:         * @version 1.0
033:         */
034:        public class Axis {
035:
036:            /** Defines a horizontal x-axis. */
037:            public final static int HORIZONTAL = 1;
038:
039:            /** Defines a vertical y-axis. */
040:            public final static int VERTICAL = 2;
041:
042:            /** Defines a logarithmic scale. */
043:            public final static int LOGARITHMIC = 3;
044:
045:            /** Defines a linear scale. */
046:            public final static int LINEAR = 4;
047:
048:            /** The axis' alignment. */
049:            private int align = HORIZONTAL;
050:
051:            ChartDataModelConstraints constraints;
052:
053:            int length = Integer.MAX_VALUE;
054:
055:            /** Creates new Axis.
056:             * @param align the alignment of the axis.
057:             * @param c the ChartDataModelConstraints 
058:             */
059:            public Axis(int align, ChartDataModelConstraints c) {
060:
061:                if (align == HORIZONTAL || align == VERTICAL)
062:                    this .align = align;
063:
064:                this .constraints = c;
065:            }
066:
067:            /** Returns the alignment of the axis.
068:             * @return the alignment constant: <CODE>Axis.VERTICAL</CODE> or <CODE>Axis.HORIZONTAL</CODE>
069:             */
070:            public int getAlignment() {
071:                return align;
072:            }
073:
074:            /** Sets the Pixel length of the axis.
075:             * @param length the length in pixel
076:             */
077:            public void setLength(int length) {
078:                this .length = length;
079:            }
080:
081:            /** Returns length of the axis in pixels.
082:             * @return the length in pixels
083:             */
084:            public int getLength() {
085:                return length;
086:            }
087:
088:            /** Returns the point on the axis for a specific value.
089:             * If the axis is a x-axis and the column values are not numeric,
090:             * this isn't needed since then the axis can be divided into
091:             * equally long parts. This is a relative pixel distance to
092:             * the starting pixel of the axis.
093:             * @param value the double value to compute the pixel distance for
094:             * @return the pixel distance for the given value relative to the start of the axis
095:             */
096:            public double getPixelForValue(double value) {
097:                // if scale == linear
098:                if (getAlignment() == Axis.VERTICAL) {
099:                    return (value - constraints.getMinimumValue().doubleValue())
100:                            / getPointToPixelRatio();
101:                } else {
102:                    return (value - constraints.getMinimumColumnValue())
103:                            / getPointToPixelRatio();
104:                }
105:            }
106:
107:            /** Returns the ratio between a value unit and the screen pixels.
108:             * This is only useful for linear scales.
109:             * @return the ratio points / pixel length for the axis.
110:             */
111:            public double getPointToPixelRatio() {
112:                //System.out.println("** constraints.getMaximumColumnValue() = "+constraints.getMaximumColumnValue());
113:                if (getAlignment() == Axis.VERTICAL) {
114:
115:                    return (constraints.getMaximumValue().doubleValue() - constraints
116:                            .getMinimumValue().doubleValue())
117:                            / length;
118:                } else
119:                    return (constraints.getMaximumColumnValue() - constraints
120:                            .getMinimumColumnValue())
121:                            / length;
122:            }
123:        }
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