[PATCH i-g-t 08/16] plot: Add top and right axes

[Damien Lespiau <damien.lespiau@xxxxxxxxx>]

This frames a bit more the plot will look nice with a background grid.

Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
---
 lib/igt_plot.c  | 46 +++++++++++++++++++++++++++++++++++++---------
 lib/igt_plot.h  |  2 ++
 lib/igt_types.h | 14 ++++++++++++++
 3 files changed, 53 insertions(+), 9 deletions(-)

diff --git a/lib/igt_plot.c b/lib/igt_plot.c
index 9a1bea2..126f160 100644
--- a/lib/igt_plot.c
+++ b/lib/igt_plot.c
@@ -221,12 +221,16 @@ igt_vector_t *igt_vector_linear(double min, double max, unsigned int n)
 }
 
 static void igt_plot_axis_init(igt_plot_axis_t *axis,
-			       igt_orientation_t orientation)
+			       igt_side_t side)
 {
 	memset(axis, 0, sizeof(*axis));
 
 	axis->n_ticks = 5;
-	axis->orientation = orientation;
+	axis->side = side;
+	if (side == IGT_SIDE_TOP || side == IGT_SIDE_BOTTOM)
+		axis->orientation = IGT_ORIENTATION_HORIZONTAL;
+	else
+		axis->orientation = IGT_ORIENTATION_VERTICAL;
 	axis->min = DBL_MAX;
 	axis->max = -DBL_MAX;
 }
@@ -280,8 +284,10 @@ void igt_plot_init(igt_plot_t *plot, unsigned int width, unsigned int height)
 	plot->height = height;
 	plot->cr = cairo_create(plot->surface);
 
-	igt_plot_axis_init(&plot->x_axis, IGT_ORIENTATION_HORIZONTAL);
-	igt_plot_axis_init(&plot->y_axis, IGT_ORIENTATION_VERTICAL);
+	igt_plot_axis_init(&plot->x_axis, IGT_SIDE_BOTTOM);
+	igt_plot_axis_init(&plot->y_axis, IGT_SIDE_LEFT);
+	igt_plot_axis_init(&plot->x_axis_top, IGT_SIDE_TOP);
+	igt_plot_axis_init(&plot->y_axis_right, IGT_SIDE_RIGHT);
 
 	plot->ctx = &plot->contexts[0];
 	igt_plot_ctx_init(plot->ctx);
@@ -501,6 +507,7 @@ static void igt_plot_draw_ticks(igt_plot_t *plot, igt_plot_axis_t *axis,
 	area_width = area->x2 - area->x1;
 	area_height = area->y2 - area->y1;
 
+	cairo_set_font_size(plot->cr, flush->tick_label_font_size);
 	cairo_set_line_cap(plot->cr, CAIRO_LINE_CAP_SQUARE);
 	cairo_set_line_width(plot->cr, 1.0);
 
@@ -508,7 +515,7 @@ static void igt_plot_draw_ticks(igt_plot_t *plot, igt_plot_axis_t *axis,
 		double x, y;
 		igt_label_t *label;
 
-		if (axis->orientation == IGT_ORIENTATION_HORIZONTAL) {
+		if (axis->side == IGT_SIDE_BOTTOM) {
 			x = area->x1 + i * area_width / (axis->n_ticks - 1);
 			y = area->y2;
 
@@ -518,7 +525,8 @@ static void igt_plot_draw_ticks(igt_plot_t *plot, igt_plot_axis_t *axis,
 
 			label = &flush->x_tick_labels[i];
 			y += flush->tick_label_padding;
-		} else {
+			igt_plot_draw_text(plot, x, y, label);
+		} else if (axis->side == IGT_SIDE_LEFT) {
 			x = area->x1;
 			y = area->y2 - i * area_height / (axis->n_ticks - 1);
 
@@ -528,10 +536,22 @@ static void igt_plot_draw_ticks(igt_plot_t *plot, igt_plot_axis_t *axis,
 
 			label = &flush->y_tick_labels[i];
 			x -= flush->tick_label_padding;
-		}
+			igt_plot_draw_text(plot, x, y, label);
+		} else if (axis->side == IGT_SIDE_TOP) {
+			x = area->x1 + i * area_width / (axis->n_ticks - 1);
+			y = area->y1;
 
-		cairo_set_font_size(plot->cr, flush->tick_label_font_size);
-		igt_plot_draw_text(plot, x, y, label);
+			cairo_move_to(plot->cr, SNAP(x), y);
+			cairo_line_to(plot->cr, SNAP(x), SNAP(y + tick_length));
+			cairo_stroke(plot->cr);
+		} else {
+			x = area->x2;
+			y = area->y1 + i * area_height / (axis->n_ticks - 1);
+
+			cairo_move_to(plot->cr, x, SNAP(y));
+			cairo_line_to(plot->cr, SNAP(x - tick_length), SNAP(y));
+			cairo_stroke(plot->cr);
+		}
 	}
 }
 
@@ -545,11 +565,19 @@ static void igt_plot_draw_axis(igt_plot_t *plot, flush_t *flush)
 	cairo_line_to(plot->cr, area->x2, area->y2);
 	igt_plot_draw_ticks(plot, &plot->x_axis, tick_length, flush);
 
+	cairo_move_to(plot->cr, area->x1, area->y1);
+	cairo_line_to(plot->cr, area->x2, area->y1);
+	igt_plot_draw_ticks(plot, &plot->x_axis_top, tick_length, flush);
+
 	/* Y-axis */
 	cairo_move_to(plot->cr, area->x1, area->y2);
 	cairo_line_to(plot->cr, area->x1, area->y1);
 	igt_plot_draw_ticks(plot, &plot->y_axis, tick_length, flush);
 
+	cairo_move_to(plot->cr, area->x2, area->y1);
+	cairo_line_to(plot->cr, area->x2, area->y2);
+	igt_plot_draw_ticks(plot, &plot->y_axis_right, tick_length, flush);
+
 }
 
 static void igt_plot_layout_tick_labels(igt_plot_t *plot,
diff --git a/lib/igt_plot.h b/lib/igt_plot.h
index 2af035e..c8b031f 100644
--- a/lib/igt_plot.h
+++ b/lib/igt_plot.h
@@ -74,6 +74,7 @@ void igt_vector_get_min_max(const igt_vector_t *v, double *min, double *max);
 typedef struct {
 	/*< private >*/
 	igt_orientation_t orientation;
+	igt_side_t side;
 	unsigned int n_ticks;
 	double min, max; /* range of the values on this axis */
 } igt_plot_axis_t;
@@ -104,6 +105,7 @@ typedef struct {
 	unsigned int width, height;
 	igt_trbl_t margin;
 	igt_plot_axis_t x_axis, y_axis;
+	igt_plot_axis_t x_axis_top, y_axis_right;
 
 	/* per draw command contexts */
 	igt_plot_ctx_t contexts[IGT_PLOT_MAX_PLOTS + 1];
diff --git a/lib/igt_types.h b/lib/igt_types.h
index 3d7f1d6..959aa4b 100644
--- a/lib/igt_types.h
+++ b/lib/igt_types.h
@@ -66,6 +66,20 @@ typedef struct {
 } igt_box_t;
 
 /**
+ * igt_side_t:
+ * @IGT_SIDE_TOP: Top
+ * @IGT_SIDE_RIGHT: Right
+ * @IGT_SIDE_BOTTOM: Bottom
+ * @IGT_SIDE_LEFT: Left
+ */
+typedef enum {
+	IGT_SIDE_TOP,
+	IGT_SIDE_RIGHT,
+	IGT_SIDE_BOTTOM,
+	IGT_SIDE_LEFT,
+} igt_side_t;
+
+/**
  * igt_trbl_t:
  * @top: Top value
  * @right: Right value
-- 
2.1.0

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