From 828aaa231a84f9ad23cf836a71b58290b5e217e8 Mon Sep 17 00:00:00 2001
From: Dave Davenport <qball@blame.services>
Date: Mon, 14 Jun 2021 16:04:15 +0200
Subject: [PATCH] [Theme] Add angle support to linear-gradient.

---
 doc/rofi-theme.5          | 3 +++
 doc/rofi-theme.5.markdown | 2 ++
 include/rofi-types.h      | 2 ++
 lexer/theme-parser.y      | 8 ++++++++
 source/theme.c            | 9 +++++++++
 5 files changed, 24 insertions(+)

diff --git a/doc/rofi-theme.5 b/doc/rofi-theme.5
index ec5d49ce..c089fdfe 100644
--- a/doc/rofi-theme.5
+++ b/doc/rofi-theme.5
@@ -370,6 +370,9 @@ Format: linear\-gradient(stop color,stop1, color, stop2 color, ...);
 .IP \(bu 2
 Format: linear\-gradient(to direction, stop color,stop1, color, stop2 color, ...);
 where direction is:   top,left,right,bottom.
+.IP \(bu 2
+Format: linear\-gradient(angle, stop color,stop1, color, stop2 color, ...);
+Angle in deg,rad,grad (as used in color).
 
 .PP
 Where the path is a string, and stop color is of type color.
diff --git a/doc/rofi-theme.5.markdown b/doc/rofi-theme.5.markdown
index 5dc72de9..336f4cc5 100644
--- a/doc/rofi-theme.5.markdown
+++ b/doc/rofi-theme.5.markdown
@@ -258,6 +258,8 @@ dynamic: false;
 * Format: linear-gradient(stop color,stop1, color, stop2 color, ...);
 * Format: linear-gradient(to direction, stop color,stop1, color, stop2 color, ...);
   where direction is:   top,left,right,bottom.
+* Format: linear-gradient(angle, stop color,stop1, color, stop2 color, ...);
+  Angle in deg,rad,grad (as used in color).
 
 Where the path is a string, and stop color is of type color.
 
diff --git a/include/rofi-types.h b/include/rofi-types.h
index b7d57898..7e0794d3 100644
--- a/include/rofi-types.h
+++ b/include/rofi-types.h
@@ -185,6 +185,7 @@ typedef enum
     ROFI_DIRECTION_RIGHT,
     ROFI_DIRECTION_TOP,
     ROFI_DIRECTION_BOTTOM,
+    ROFI_DIRECTION_ANGLE,
 } RofiDirection;
 
 
@@ -194,6 +195,7 @@ typedef struct
     char *url;
 
     RofiDirection dir;
+    double angle;
     /** colors */
     GList *colors;
 
diff --git a/lexer/theme-parser.y b/lexer/theme-parser.y
index 5fb304c7..94bf3cd3 100644
--- a/lexer/theme-parser.y
+++ b/lexer/theme-parser.y
@@ -556,6 +556,14 @@ t_property_element
         $$->value.image.dir    = $4;
         $$->value.image.colors = $6;
 }
+| T_LINEAR_GRADIENT T_PARENT_LEFT t_property_color_value_angle T_COMMA t_color_list T_PARENT_RIGHT {
+        $$ = rofi_theme_property_create ( P_IMAGE );
+        $$->value.image.type = ROFI_IMAGE_LINEAR_GRADIENT;
+        $$->value.image.dir    = ROFI_DIRECTION_ANGLE;
+        $$->value.image.angle  = $3;
+        $$->value.image.colors = $5;
+}
+
 ;
 
 t_property_direction
diff --git a/source/theme.c b/source/theme.c
index 219daf4f..f70f0c45 100644
--- a/source/theme.c
+++ b/source/theme.c
@@ -1015,6 +1015,15 @@ gboolean rofi_theme_get_image ( const widget *widget, const char *property, cair
               case ROFI_DIRECTION_TOP:
                 pat = cairo_pattern_create_linear (0.0,widget->h, 0.0, 0.0);
                 break;
+              case ROFI_DIRECTION_ANGLE:
+              {
+                double offsety1 = sin(G_PI*2*p->value.image.angle)*(widget->h/2.0);
+                double offsetx1 = cos(G_PI*2*p->value.image.angle)*(widget->w/2.0);
+                pat = cairo_pattern_create_linear (
+                    widget->w/2.0 - offsetx1, widget->h/2.0 - offsety1,
+                    widget->w/2.0 + offsetx1, widget->h/2.0 + offsety1 );
+                break;
+              }
             };
             guint length = g_list_length ( p->value.image.colors );
             if ( length > 1 ){