[gnumeric] write loext:*intercept*

[Andreas J. Guelzow <guelzow src gnome org>]

commit 64388169ea6ccb744e28968c2ec0a7f117efbd81
Author: Andreas J. Guelzow <aguelzow pyrshep ca>
Date:   Mon Jan 26 00:40:46 2015 -0700

    write loext:*intercept*
    
    2015-01-25  Andreas J. Guelzow <aguelzow pyrshep ca>
    
        * openoffice-write.c (odf_write_plot_style_affine): new
        (odf_write_lin_reg): call odf_write_plot_style_affine
        (odf_write_polynom_reg): call odf_write_plot_style_affine
        (odf_write_exp_reg): call odf_write_plot_style_affine

 plugins/openoffice/ChangeLog          |    7 +++++++
 plugins/openoffice/openoffice-write.c |   20 ++++++++++++++++----
 2 files changed, 23 insertions(+), 4 deletions(-)
---
diff --git a/plugins/openoffice/ChangeLog b/plugins/openoffice/ChangeLog
index 61eeb4f..23c8239 100644
--- a/plugins/openoffice/ChangeLog
+++ b/plugins/openoffice/ChangeLog
@@ -1,5 +1,12 @@
 2015-01-25  Andreas J. Guelzow <aguelzow pyrshep ca>
 
+       * openoffice-write.c (odf_write_plot_style_affine): new
+       (odf_write_lin_reg): call odf_write_plot_style_affine
+       (odf_write_polynom_reg): call odf_write_plot_style_affine
+       (odf_write_exp_reg): call odf_write_plot_style_affine
+
+2015-01-25  Andreas J. Guelzow <aguelzow pyrshep ca>
+
        * openoffice-write.c (odf_write_data_attribute): add argument, change all callers
        and write loext extendion if appropriate
        (odf_write_reg_name): pass loext extension name to odf_write_data_attribute
diff --git a/plugins/openoffice/openoffice-write.c b/plugins/openoffice/openoffice-write.c
index 750225e..cd04424 100644
--- a/plugins/openoffice/openoffice-write.c
+++ b/plugins/openoffice/openoffice-write.c
@@ -8120,15 +8120,26 @@ odf_write_reg_name (GnmOOExport *state, GogObject const *obj)
 }
 
 static void
+odf_write_plot_style_affine (GsfXMLOut *xml, GogObject const *plot, float intercept)
+{
+       gboolean b;
+       if (gnm_object_has_readable_prop (plot, "affine", G_TYPE_BOOLEAN, &b)) {
+               odf_add_bool (xml, GNMSTYLE "regression-affine", b);
+               odf_add_bool (xml, LOEXT "regression-force-intercept", !b);
+               gsf_xml_out_add_float (xml, LOEXT "regression-intercept-value", intercept, -1); 
+       }
+}
+
+
+static void
 odf_write_lin_reg (GnmOOExport *state, G_GNUC_UNUSED GOStyle const *style,
                   GogObject const *obj)
 {
        gsf_xml_out_add_cstr (state->xml, CHART "regression-type",  "linear");
        if (state->with_extension) {
-               odf_write_plot_style_bool (state->xml, obj,
-                                         "affine", GNMSTYLE "regression-affine");
                odf_write_plot_style_uint (state->xml, obj,
                                          "dims", GNMSTYLE "regression-polynomial-dims");
+               odf_write_plot_style_affine (state->xml, obj, 0.);
        }
        odf_write_reg_name (state, obj);
 }
@@ -8142,8 +8153,7 @@ odf_write_polynom_reg (GnmOOExport *state, G_GNUC_UNUSED GOStyle const *style,
                                      GNMSTYLE "polynomial");
                odf_write_plot_style_uint (state->xml, obj,
                                          "dims", GNMSTYLE "regression-polynomial-dims");
-               odf_write_plot_style_bool (state->xml, obj,
-                                         "affine", GNMSTYLE "regression-affine");
+               odf_write_plot_style_affine (state->xml, obj, 0.);
        }
        odf_write_reg_name (state, obj);
 }
@@ -8153,6 +8163,8 @@ odf_write_exp_reg (GnmOOExport *state, G_GNUC_UNUSED GOStyle const *style,
                   G_GNUC_UNUSED GogObject const *obj)
 {
        gsf_xml_out_add_cstr (state->xml, CHART "regression-type",  "exponential");
+       if (state->with_extension)
+               odf_write_plot_style_affine (state->xml, obj, 1.);
        odf_write_reg_name (state, obj);
 }