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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><HTML> <HEAD><TITLE>Example3</TITLE></HEAD><BODY><H1 ALIGN=CENTER>Example 3</H1>This is an example of <I>real</I> data (courtesy of<A HREF=http://www-igpp.llnl.gov/people/gregg.html>Michael Gregg</A>)<BR>The data is stored in a file on the server and isretrieved by the applet. There are approximately 2500 data points in thefile.<P>This applet uses the G2Dint class to build the plot. This allows the usersome interactive control over the plot and the ability to retrieve data points.<P><DL> <DT><B><FONT COLOR="#FF00FF">Mouse Down, Drag, Up</FONT></B> <DD>By pressing the mouse button and dragging it across the screen the scale of the plot can be altered. With the release of the mouse button the plot is redrawn using the new scale. This can be used to zoom in on a section of the plot. Data outside the plot is clipped. <P> <DT><B><FONT COLOR="#FF00FF">Keypress R</FONT></B> <DD>By pressing R the plot is rescaled back to the default scale of the data. <P> <DT><B><FONT COLOR="#FF00FF">Keypress r</FONT></B> <DD>By pressing r the plot is repainted. This is useful when scrolling the page as scrolling can effect the plot in odd ways. <P> <DT><B><FONT COLOR="#FF00FF">Keypress d</FONT></B> <DD>This event will popup a window that will display the closest data point to the cursor. Repeated pressing of the key while moving the cursor will display the closest data point to the cursor. A black dot will be plotted over the data point to indicate which data point has been found. <P> Use Keypress r to refresh the plot and erase the black dots. <P> <DT><B><FONT COLOR="#FF00FF">Keypress D</FONT></B> <DD>This event will hide the closest data point window. <P> <DT><B><FONT COLOR="#FF00FF">Keypress m</FONT></B> <DD>This event will popup a window that will allow the user to set the plot range by entering the xmin,xmax, ymin and ymax limits. Any field left blank will be ignored. Hitting return in any field will move the cursor to the next field in the list. <P> <DT><B><FONT COLOR="#FF00FF">Keypress h</FONT></B> <DD>This event if it occurs in Any of the popup windows will cause the window to be hidden. This can be used if the popup windows are accidentally left behind after the main window has disappeared. <P></DL></BODY> </HTML>⌨️ 快捷键说明
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