gfio: right justify y-axis labels
authorStephen M. Cameron <stephenmcameron@gmail.com>
Wed, 7 Mar 2012 18:39:55 +0000 (19:39 +0100)
committerJens Axboe <axboe@kernel.dk>
Wed, 7 Mar 2012 18:39:55 +0000 (19:39 +0100)
Signed-off-by: Jens Axboe <axboe@kernel.dk>
graph.c

diff --git a/graph.c b/graph.c
index 40c5256..4a3a993 100644 (file)
--- a/graph.c
+++ b/graph.c
@@ -186,22 +186,62 @@ static void draw_bars(struct graph *bg, cairo_t *cr, struct graph_label *lb,
        }
 }
 
-static void draw_centered_text(struct graph *g, cairo_t *cr, double x, double y,
-                              double fontsize, const char *text)
+static void draw_aligned_text(struct graph *g, cairo_t *cr, double x, double y,
+                              double fontsize, const char *text, int alignment)
 {
+#define CENTERED 0
+#define LEFT_JUSTIFIED 1
+#define RIGHT_JUSTIFIED 2
+
+       double factor, direction;
        cairo_text_extents_t extents;
 
+       switch(alignment) {
+               case CENTERED:
+                       direction = -1.0;
+                       factor = 0.5;
+                       break;
+               case RIGHT_JUSTIFIED:
+                       direction = -1.0;
+                       factor = 1.0;
+                       break;
+               case LEFT_JUSTIFIED:
+               default:
+                       direction = 1.0;
+                       factor = 1.0;
+                       break;
+       }
        cairo_select_font_face (cr, g->font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
 
        cairo_set_font_size(cr, fontsize);
        cairo_text_extents(cr, text, &extents);
-       x = x - (extents.width / 2 + extents.x_bearing);
+       x = x + direction * (factor * extents.width  + extents.x_bearing);
        y = y - (extents.height / 2 + extents.y_bearing);
 
        cairo_move_to(cr, x, y);
        cairo_show_text(cr, text);
 }
 
+static inline void draw_centered_text(struct graph *g, cairo_t *cr, double x, double y,
+                              double fontsize, const char *text)
+{
+       draw_aligned_text(g, cr, x, y, fontsize, text, CENTERED);
+}
+
+static inline void draw_right_justified_text(struct graph *g, cairo_t *cr,
+                               double x, double y,
+                               double fontsize, const char *text)
+{
+       draw_aligned_text(g, cr, x, y, fontsize, text, RIGHT_JUSTIFIED);
+}
+
+static inline void draw_left_justified_text(struct graph *g, cairo_t *cr,
+                               double x, double y,
+                               double fontsize, const char *text)
+{
+       draw_aligned_text(g, cr, x, y, fontsize, text, LEFT_JUSTIFIED);
+}
+
 static void draw_vertical_centered_text(struct graph *g, cairo_t *cr, double x,
                                        double y, double fontsize,
                                        const char *text)
@@ -320,7 +360,7 @@ static void graph_draw_y_ticks(struct graph *g, cairo_t *cr,
                cairo_restore(cr);
 
                /* draw tickmark label */
-               draw_centered_text(g, cr, x1 - (x2 - x1) * 0.04, ty, 12.0, tm[i].string);
+               draw_right_justified_text(g, cr, x1 - (x2 - x1) * 0.025, ty, 12.0, tm[i].string);
                cairo_stroke(cr);
        }
 }
@@ -383,7 +423,7 @@ static double gety(struct graph_value *v)
 
 static double find_xy_value(struct graph *g, xy_value_extractor getvalue, double_comparator cmp)
 {
-       double tmp, answer;
+       double tmp, answer = 0.0;
        struct graph_label *i;
        struct graph_value *j;
        int first = 1;