[goffice] Implement equations rotation. [#622782]

[Jean Bréfort <jbrefort src gnome org>]

commit 5184696992ca6228d6b9e76707b7fe9bfe6f7937
Author: Jean Brefort <jean brefort normalesup org>
Date:   Sun Jun 27 10:53:26 2010 +0200

    Implement equations rotation. [#622782]

 ChangeLog                    |    7 +++++++
 NEWS                         |    1 +
 goffice/graph/gog-equation.c |   16 +++++++++++++---
 goffice/graph/gog-renderer.c |   13 ++++++++++++-
 4 files changed, 33 insertions(+), 4 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 652d4b3..876e83c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2010-06-27  Jean Brefort  <jean brefort normalesup org>
+
+	* goffice/graph/gog-equation.c (gog_equation_init_style),
+	(gog_equation_view_size_request), (gog_equation_view_render): implement
+	equations rotation. [#622782]
+	* goffice/graph/gog-renderer.c (gog_renderer_draw_equation):
+
 2010-06-24  Jean Brefort  <jean brefort normalesup org>
 
 	* pixmaps/Makefile.am: add new icons.
diff --git a/NEWS b/NEWS
index c8cf4d0..4d3a8df 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@ goffice 0.8.7:
 Jean:
 	* Implement cumulative histograms.
 	* Make histogram able to use raw data.
+	* Implement equations rotation. [#622782]
 
 --------------------------------------------------------------------------
 goffice 0.8.6:
diff --git a/goffice/graph/gog-equation.c b/goffice/graph/gog-equation.c
index 554bab0..f656eac 100644
--- a/goffice/graph/gog-equation.c
+++ b/goffice/graph/gog-equation.c
@@ -290,6 +290,7 @@ gog_equation_init_style (GogStyledObject *gso, GOStyle *style)
 	style->interesting_fields =
 		GO_STYLE_OUTLINE |
 		GO_STYLE_FILL |
+		GO_STYLE_TEXT_LAYOUT |
 		GO_STYLE_FONT;
 
 	gog_theme_fillin_style (gog_object_get_theme (GOG_OBJECT (gso)),
@@ -377,6 +378,8 @@ gog_equation_view_size_request (GogView *view,
 	double height, width;
 	GogEquation *equation;
 	GogEquationView *equation_view;
+	GOGeometryAABR aabr;
+	GOGeometryOBR obr;
 
 	equation = GOG_EQUATION (view->model);
 	equation_view = GOG_EQUATION_VIEW (view);
@@ -391,8 +394,13 @@ gog_equation_view_size_request (GogView *view,
 				   LSM_DOM_DOCUMENT (equation->mathml));
 	lsm_dom_view_get_size (LSM_DOM_VIEW (equation_view->mathml_view), &width, &height);
 
-	requisition->w = gog_renderer_pt2r_x (view->renderer, width);
-	requisition->h = gog_renderer_pt2r_y (view->renderer, height);
+	obr.w = gog_renderer_pt2r_x (view->renderer, width);
+	obr.h = gog_renderer_pt2r_y (view->renderer, height);
+	obr.alpha = -go_styled_object_get_style (GO_STYLED_OBJECT(equation))->text_layout.angle * M_PI / 180.0;
+
+	go_geometry_OBR_to_AABR (&obr, &aabr);
+	requisition->w = aabr.w;
+	requisition->h = aabr.h;
 
 	equation_view_parent_klass->size_request (view, available, requisition);
 }
@@ -414,8 +422,10 @@ gog_equation_view_render (GogView *view,
 
 	lsm_dom_view_set_document (LSM_DOM_VIEW (equation_view->mathml_view),
 				   LSM_DOM_DOCUMENT (equation->mathml));
+	gog_renderer_push_style (view->renderer, go_styled_object_get_style (GO_STYLED_OBJECT(equation)));
 	gog_renderer_draw_equation (view->renderer, equation_view->mathml_view,
-				    view->residual.x, view->residual.y);
+				    view->residual.x + view->residual.w / 2., view->residual.y + view->residual.h / 2.);
+	gog_renderer_pop_style (view->renderer);
 }
 
 static void
diff --git a/goffice/graph/gog-renderer.c b/goffice/graph/gog-renderer.c
index b63515b..f7ec109 100644
--- a/goffice/graph/gog-renderer.c
+++ b/goffice/graph/gog-renderer.c
@@ -1354,18 +1354,29 @@ void
 gog_renderer_draw_equation (GogRenderer *renderer, LsmMathmlView *mathml_view, double x, double y)
 {
 	cairo_t *cairo;
+	double w, h, alpha;
 
 	g_return_if_fail (GOG_IS_RENDERER (renderer));
 	g_return_if_fail (LSM_IS_MATHML_VIEW (mathml_view));
+	g_return_if_fail (renderer->cur_style != NULL);
 
 	cairo = renderer->cairo;
 
+	alpha = -renderer->cur_style->text_layout.angle * M_PI / 180.0;
+	lsm_dom_view_get_size (LSM_DOM_VIEW (mathml_view), &w, &h);
+	w *= renderer->scale;
+	h *= renderer->scale;
+	x = x - (w / 2.0) * cos (alpha) + (h / 2.0) * sin (alpha);
+	y = y - (w / 2.0) * sin (alpha) - (h / 2.0) * cos (alpha);
+
 	cairo_save (cairo);
 
+	cairo_translate (cairo, x, y);
+	cairo_rotate (cairo, alpha);
 	cairo_scale (cairo, renderer->scale_x, renderer->scale_y);
 
 	lsm_dom_view_set_cairo (LSM_DOM_VIEW (mathml_view), cairo);
-	lsm_dom_view_render (LSM_DOM_VIEW (mathml_view), x / renderer->scale_x, y / renderer->scale_y);
+	lsm_dom_view_render (LSM_DOM_VIEW (mathml_view), 0., 0.);
 
 	cairo_restore (cairo);
 }