📄 crosshairstate.html
字号:
<HTML><BODY BGCOLOR="white"><PRE><FONT color="green">001</FONT> /* ===========================================================<a name="line.1"></a><FONT color="green">002</FONT> * JFreeChart : a free chart library for the Java(tm) platform<a name="line.2"></a><FONT color="green">003</FONT> * ===========================================================<a name="line.3"></a><FONT color="green">004</FONT> *<a name="line.4"></a><FONT color="green">005</FONT> * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.<a name="line.5"></a><FONT color="green">006</FONT> *<a name="line.6"></a><FONT color="green">007</FONT> * Project Info: http://www.jfree.org/jfreechart/index.html<a name="line.7"></a><FONT color="green">008</FONT> *<a name="line.8"></a><FONT color="green">009</FONT> * This library is free software; you can redistribute it and/or modify it <a name="line.9"></a><FONT color="green">010</FONT> * under the terms of the GNU Lesser General Public License as published by <a name="line.10"></a><FONT color="green">011</FONT> * the Free Software Foundation; either version 2.1 of the License, or <a name="line.11"></a><FONT color="green">012</FONT> * (at your option) any later version.<a name="line.12"></a><FONT color="green">013</FONT> *<a name="line.13"></a><FONT color="green">014</FONT> * This library is distributed in the hope that it will be useful, but <a name="line.14"></a><FONT color="green">015</FONT> * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY <a name="line.15"></a><FONT color="green">016</FONT> * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public <a name="line.16"></a><FONT color="green">017</FONT> * License for more details.<a name="line.17"></a><FONT color="green">018</FONT> *<a name="line.18"></a><FONT color="green">019</FONT> * You should have received a copy of the GNU Lesser General Public<a name="line.19"></a><FONT color="green">020</FONT> * License along with this library; if not, write to the Free Software<a name="line.20"></a><FONT color="green">021</FONT> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, <a name="line.21"></a><FONT color="green">022</FONT> * USA. <a name="line.22"></a><FONT color="green">023</FONT> *<a name="line.23"></a><FONT color="green">024</FONT> * [Java is a trademark or registered trademark of Sun Microsystems, Inc. <a name="line.24"></a><FONT color="green">025</FONT> * in the United States and other countries.]<a name="line.25"></a><FONT color="green">026</FONT> *<a name="line.26"></a><FONT color="green">027</FONT> * -------------------<a name="line.27"></a><FONT color="green">028</FONT> * CrosshairState.java<a name="line.28"></a><FONT color="green">029</FONT> * -------------------<a name="line.29"></a><FONT color="green">030</FONT> * (C) Copyright 2002-2006, by Object Refinery Limited.<a name="line.30"></a><FONT color="green">031</FONT> *<a name="line.31"></a><FONT color="green">032</FONT> * Original Author: David Gilbert (for Object Refinery Limited);<a name="line.32"></a><FONT color="green">033</FONT> * Contributor(s): -;<a name="line.33"></a><FONT color="green">034</FONT> *<a name="line.34"></a><FONT color="green">035</FONT> * $Id: CrosshairState.java,v 1.3.2.2 2006/08/24 09:22:28 mungady Exp $<a name="line.35"></a><FONT color="green">036</FONT> *<a name="line.36"></a><FONT color="green">037</FONT> * Changes<a name="line.37"></a><FONT color="green">038</FONT> * -------<a name="line.38"></a><FONT color="green">039</FONT> * 24-Jan-2002 : Version 1 (DG);<a name="line.39"></a><FONT color="green">040</FONT> * 05-Mar-2002 : Added Javadoc comments (DG);<a name="line.40"></a><FONT color="green">041</FONT> * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);<a name="line.41"></a><FONT color="green">042</FONT> * 19-Sep-2003 : Modified crosshair distance calculation (DG);<a name="line.42"></a><FONT color="green">043</FONT> * 04-Dec-2003 : Crosshair anchor point now stored outside chart since it is<a name="line.43"></a><FONT color="green">044</FONT> * dependent on the display target (DG);<a name="line.44"></a><FONT color="green">045</FONT> * 25-Feb-2004 : Replaced CrosshairInfo --> CrosshairState (DG); <a name="line.45"></a><FONT color="green">046</FONT> *<a name="line.46"></a><FONT color="green">047</FONT> */<a name="line.47"></a><FONT color="green">048</FONT> <a name="line.48"></a><FONT color="green">049</FONT> package org.jfree.chart.plot;<a name="line.49"></a><FONT color="green">050</FONT> <a name="line.50"></a><FONT color="green">051</FONT> import java.awt.geom.Point2D;<a name="line.51"></a><FONT color="green">052</FONT> <a name="line.52"></a><FONT color="green">053</FONT> /**<a name="line.53"></a><FONT color="green">054</FONT> * Maintains state information about crosshairs on a plot.<a name="line.54"></a><FONT color="green">055</FONT> */<a name="line.55"></a><FONT color="green">056</FONT> public class CrosshairState {<a name="line.56"></a><FONT color="green">057</FONT> <a name="line.57"></a><FONT color="green">058</FONT> /** <a name="line.58"></a><FONT color="green">059</FONT> * A flag that controls whether the distance is calculated in data space <a name="line.59"></a><FONT color="green">060</FONT> * or Java2D space. <a name="line.60"></a><FONT color="green">061</FONT> */<a name="line.61"></a><FONT color="green">062</FONT> private boolean calculateDistanceInDataSpace = false;<a name="line.62"></a><FONT color="green">063</FONT> <a name="line.63"></a><FONT color="green">064</FONT> /** The x-value (in data space) for the anchor point. */<a name="line.64"></a><FONT color="green">065</FONT> private double anchorX;<a name="line.65"></a><FONT color="green">066</FONT> <a name="line.66"></a><FONT color="green">067</FONT> /** The y-value (in data space) for the anchor point. */<a name="line.67"></a><FONT color="green">068</FONT> private double anchorY;<a name="line.68"></a><FONT color="green">069</FONT> <a name="line.69"></a><FONT color="green">070</FONT> /** The anchor point in Java2D space - if null, don't update crosshair. */<a name="line.70"></a><FONT color="green">071</FONT> private Point2D anchor;<a name="line.71"></a><FONT color="green">072</FONT> <a name="line.72"></a><FONT color="green">073</FONT> /** The x-value for the crosshair point. */<a name="line.73"></a><FONT color="green">074</FONT> private double crosshairX;<a name="line.74"></a><FONT color="green">075</FONT> <a name="line.75"></a><FONT color="green">076</FONT> /** The y-value for the crosshair point. */<a name="line.76"></a><FONT color="green">077</FONT> private double crosshairY;<a name="line.77"></a><FONT color="green">078</FONT> <a name="line.78"></a><FONT color="green">079</FONT> /** <a name="line.79"></a><FONT color="green">080</FONT> * The smallest distance so far between the anchor point and a data point. <a name="line.80"></a><FONT color="green">081</FONT> */<a name="line.81"></a><FONT color="green">082</FONT> private double distance;<a name="line.82"></a><FONT color="green">083</FONT> <a name="line.83"></a><FONT color="green">084</FONT> /**<a name="line.84"></a><FONT color="green">085</FONT> * Default constructor.<a name="line.85"></a><FONT color="green">086</FONT> */<a name="line.86"></a><FONT color="green">087</FONT> public CrosshairState() {<a name="line.87"></a><FONT color="green">088</FONT> this(false);<a name="line.88"></a><FONT color="green">089</FONT> }<a name="line.89"></a><FONT color="green">090</FONT> <a name="line.90"></a><FONT color="green">091</FONT> /**<a name="line.91"></a><FONT color="green">092</FONT> * Creates a new info object.<a name="line.92"></a><FONT color="green">093</FONT> * <a name="line.93"></a><FONT color="green">094</FONT> * @param calculateDistanceInDataSpace a flag that controls whether the <a name="line.94"></a><FONT color="green">095</FONT> * distance is calculated in data <a name="line.95"></a><FONT color="green">096</FONT> * space or Java2D space.<a name="line.96"></a><FONT color="green">097</FONT> */<a name="line.97"></a><FONT color="green">098</FONT> public CrosshairState(boolean calculateDistanceInDataSpace) {<a name="line.98"></a><FONT color="green">099</FONT> this.calculateDistanceInDataSpace = calculateDistanceInDataSpace;<a name="line.99"></a><FONT color="green">100</FONT> }<a name="line.100"></a><FONT color="green">101</FONT> <a name="line.101"></a><FONT color="green">102</FONT> /**<a name="line.102"></a><FONT color="green">103</FONT> * Sets the distance between the anchor point and the current crosshair <a name="line.103"></a><FONT color="green">104</FONT> * point. As each data point is processed, its distance to the anchor <a name="line.104"></a><FONT color="green">105</FONT> * point is compared with this value and, if it is closer, the data point <a name="line.105"></a><FONT color="green">106</FONT> * becomes the new crosshair point.<a name="line.106"></a><FONT color="green">107</FONT> *<a name="line.107"></a><FONT color="green">108</FONT> * @param distance the distance.<a name="line.108"></a><FONT color="green">109</FONT> */<a name="line.109"></a><FONT color="green">110</FONT> public void setCrosshairDistance(double distance) {<a name="line.110"></a><FONT color="green">111</FONT> this.distance = distance;<a name="line.111"></a><FONT color="green">112</FONT> }<a name="line.112"></a><FONT color="green">113</FONT> <a name="line.113"></a><FONT color="green">114</FONT> /**<a name="line.114"></a><FONT color="green">115</FONT> * Evaluates a data point and if it is the closest to the anchor point it<a name="line.115"></a><FONT color="green">116</FONT> * becomes the new crosshair point.<a name="line.116"></a><FONT color="green">117</FONT> * <P><a name="line.117"></a><FONT color="green">118</FONT> * To understand this method, you need to know the context in which it will<a name="line.118"></a><FONT color="green">119</FONT> * be called. An instance of this class is passed to an <a name="line.119"></a><FONT color="green">120</FONT> * {@link org.jfree.chart.renderer.xy.XYItemRenderer} as<a name="line.120"></a><FONT color="green">121</FONT> * each data point is plotted. As the point is plotted, it is passed to<a name="line.121"></a><FONT color="green">122</FONT> * this method to see if it should be the new crosshair point.<a name="line.122"></a><FONT color="green">123</FONT> *<a name="line.123"></a><FONT color="green">124</FONT> * @param x x coordinate (measured against the domain axis).<a name="line.124"></a><FONT color="green">125</FONT> * @param y y coordinate (measured against the range axis).<a name="line.125"></a><FONT color="green">126</FONT> * @param transX x translated into Java2D space.<a name="line.126"></a><FONT color="green">127</FONT> * @param transY y translated into Java2D space.<a name="line.127"></a><FONT color="green">128</FONT> * @param orientation the plot orientation.<a name="line.128"></a><FONT color="green">129</FONT> */<a name="line.129"></a><FONT color="green">130</FONT> public void updateCrosshairPoint(double x, double y, <a name="line.130"></a><FONT color="green">131</FONT> double transX, double transY, <a name="line.131"></a><FONT color="green">132</FONT> PlotOrientation orientation) {<a name="line.132"></a><FONT color="green">133</FONT> <a name="line.133"></a><FONT color="green">134</FONT> if (this.anchor != null) {<a name="line.134"></a><FONT color="green">135</FONT> double d = 0.0;<a name="line.135"></a><FONT color="green">136</FONT> if (this.calculateDistanceInDataSpace) {<a name="line.136"></a><FONT color="green">137</FONT> d = (x - this.anchorX) * (x - this.anchorX)<a name="line.137"></a><FONT color="green">138</FONT> + (y - this.anchorY) * (y - this.anchorY);<a name="line.138"></a><FONT color="green">139</FONT> }<a name="line.139"></a><FONT color="green">140</FONT> else {<a name="line.140"></a><FONT color="green">141</FONT> double xx = this.anchor.getX();<a name="line.141"></a><FONT color="green">142</FONT> double yy = this.anchor.getY();<a name="line.142"></a><FONT color="green">143</FONT> if (orientation == PlotOrientation.HORIZONTAL) {<a name="line.143"></a><FONT color="green">144</FONT> double temp = yy;<a name="line.144"></a><FONT color="green">145</FONT> yy = xx;<a name="line.145"></a><FONT color="green">146</FONT> xx = temp;<a name="line.146"></a><FONT color="green">147</FONT> }<a name="line.147"></a><FONT color="green">148</FONT> d = (transX - xx) * (transX - xx) <a name="line.148"></a><FONT color="green">149</FONT> + (transY - yy) * (transY - yy); <a name="line.149"></a><FONT color="green">150</FONT> }<a name="line.150"></a><FONT color="green">151</FONT> <a name="line.151"></a><FONT color="green">152</FONT> if (d < this.distance) {<a name="line.152"></a><FONT color="green">153</FONT> this.crosshairX = x;<a name="line.153"></a><FONT color="green">154</FONT> this.crosshairY = y;<a name="line.154"></a><FONT color="green">155</FONT> this.distance = d;<a name="line.155"></a>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -