fix bugs in imexam plugins using a rotated line to defined the image …

…section

js9.js

@@ -172,6 +172,7 @@ JS9.globalOpts = {
     reduceMosaic: "js9",        // "js9" or "shrink" ("js9" seems to be faster)
     reduceRegcnts: true,        // reduce image when doing counts in regions?
     plot3d: {cube:"*:*:all", mode:"avg", areaunits:"pixels", color: "green"}, // plot3d options: avg/sum, pixels/arcsecs
+    imexamLineHeight: 1,        // "height" of line region section
     copyWcsPosFormat: "$ra $dec $sys", // format for copy wcs pos to clipboard
     floatPrecision: 6,          // precision for floatToString()
     mouseActions: ["display value/position", "change contrast/bias", "pan the image"],// 0,1,2 mousepress

js9plugins.js

@@ -12502,7 +12502,10 @@ function reg2section(xreg) {
                                         (xreg.pts[0].x - xreg.pts[1].x)) +
                                        ((xreg.pts[0].y - xreg.pts[1].y)  *
                                         (xreg.pts[0].y - xreg.pts[1].y)));
-                xreg.height = 1;
+                xreg.height = JS9.globalOpts.imexamLineHeight || 1;
+		xreg.angle = Math.atan2(xreg.pts[1].y - xreg.pts[0].y,
+					xreg.pts[1].x - xreg.pts[0].x);
+		xreg.angle = xreg.angle * 180 / Math.PI;
 	    } else {
 	        xreg.width  = maxx - minx;
 		xreg.height = maxy - miny;
@@ -12527,7 +12530,7 @@ exports.getRegionData = function (im, xreg) {
     var imag;
 
     if ( xreg.angle && xreg.angle !== 0 ) {
-	imag = ndops.zeros([xreg.width, xreg.height]);
+	imag = ndops.zeros([xreg.height, xreg.width]);
 
 	ndops.rotate(imag, im_2d, xreg.angle/57.29577951, xreg.y, xreg.x);
     } else {

plugins/imexam/imexam.html

@@ -10,17 +10,21 @@
 <div class="helpLogo"><img src="../../images/js9logo.png" alt="js9"></div>
 <div class="helpContainer">
 
-<p>
-<a name="rgstat"></a>
-<h3>Region Statistics </h3>
+<h3>JS9 Imexam Plugins</h3>
 
-A rectangular box of image pixels is selected and some statistical values 
-are computed from the data.  The selected box may be rotated for box and 
-ellipse regions.
+These tasks perform various types of image analysis using a rectangular box
+surrounding the selected region. That is, the actual region shape is ignored
+and the analysis reflects a rectangular section of image pixels. The selected
+section can be rotated for box, ellipse, and line regions. For a line region,
+the width is the length of the line, while the height is set to  the value of
+the JS9.globalOpts.imexamLineHeight parameter (default is 1).
 
 <p>
-<b>N.B.:</b> Currently the region shape is ignored and the values reflect a rectangular section of image pixels.
-<p>
+<a name="rgstat"></a>
+<h3>Region Statistics</h3>
+
+A rectangular box of image pixels is selected and some statistical
+values are computed from the data.
 
 <blockquote>
     <h4>Notes</h4>
@@ -54,21 +58,18 @@ <h4>Notes</h4>
 <a name="xyproj"></a>
 <h3>X and Y Projection Plot</h3>
 
-A rectangular box of image pixels is selected and the projection along the
-region's X or Y axis is plotted.  The sum, average or median of the projected
-pixels may be selected.  The selected box may be rotated for box and ellipse
-regions.
-
+A rectangular box of image pixels is selected and the projection along
+the region's X (width) or Y (height) axis is plotted.  The sum,
+average, or median of the projected pixels may be selected.
 
 <p>
 <a name="r_proj"></a>
 <h3>Radial Profile</h3>
 
-A rectangular box of image pixels is selected and the pixels values are
-plotted against their respective radii.  A Gaussian is fit to the radial profile
-data and the result is also plotted.  The fitted results of the 4 parameter fit
-are displayed with the plot.  The selected box may be rotated for box and 
-ellipse regions.
+A rectangular box of image pixels is selected and the pixels values
+are plotted against their respective radii.  A Gaussian is fit to the
+radial profile data and the result is also plotted.  The fitted
+results of the 4 parameter fit are displayed with the plot.
 
 <p>
 The center pixel from which the radii are computed is determined from the
@@ -80,12 +81,9 @@ <h3>Radial Profile</h3>
 <a name="rghist"></a>
 <h3>Pixel Value Histogram</h3>
 
-A rectangular box of image pixels is selected and a histogram of the values
-is plotted.  The selected box may be rotated for box and 
-ellipse regions.
-
-The selected pixels are binned into 250 bins between the minimum and maximum value
-found in the selected region.
+A rectangular box of image pixels is selected and a histogram of the
+values is plotted. The selected pixels are binned into 250 bins
+between the minimum and maximum value found in the selected region.
 
 <p>
 <a name="enener"></a>
@@ -122,7 +120,6 @@ <h3>Encircled Energy</h3>
 <h3>3d Surface Plot</h3>
 
 A rectangular box of image pixels is selected and plotted as a surface.
-The selected box may be rotated for box and ellipse regions.
 
 </div>
 </body>

plugins/imexam/imexam.js

@@ -557,7 +557,10 @@ function reg2section(xreg) {
                                         (xreg.pts[0].x - xreg.pts[1].x)) +
                                        ((xreg.pts[0].y - xreg.pts[1].y)  *
                                         (xreg.pts[0].y - xreg.pts[1].y)));
-                xreg.height = 1;
+                xreg.height = JS9.globalOpts.imexamLineHeight || 1;
+		xreg.angle = Math.atan2(xreg.pts[1].y - xreg.pts[0].y,
+					xreg.pts[1].x - xreg.pts[0].x);
+		xreg.angle = xreg.angle * 180 / Math.PI;
 	    } else {
 	        xreg.width  = maxx - minx;
 		xreg.height = maxy - miny;
@@ -582,7 +585,7 @@ exports.getRegionData = function (im, xreg) {
     var imag;
 
     if ( xreg.angle && xreg.angle !== 0 ) {
-	imag = ndops.zeros([xreg.width, xreg.height]);
+	imag = ndops.zeros([xreg.height, xreg.width]);
 
 	ndops.rotate(imag, im_2d, xreg.angle/57.29577951, xreg.y, xreg.x);
     } else {