Fix zoom centering

1 files changed, 14 insertions, 2 deletions

diff --git a/bingram.c b/bingram.c
index a624a5b..5e65d7a 100644
--- a/bingram.c
+++ b/bingram.c
@@ -150,6 +150,19 @@ update_trigram_colors(void)
 	memset(trigram_colors, 0, sizeof(Color) * 256 * 256 * 256);
 }
 
+void
+center_zoom(void)
+{
+	if (show_bar) {
+		zoom_x = -1.F * bar_width / zoom
+			- (1.F * (window_width - bar_width)
+				/ zoom - data_width) / 2.F;
+	} else {
+		zoom_x = -(1.F * window_width / zoom - data_width) / 2.F;
+	}
+	zoom_y = -(1.F * window_height / zoom - data_height) / 2.F;
+}
+
 bool
 key_press_hold(int key)
 {
@@ -224,8 +237,7 @@ vis(void)
 			}
 			if (IsKeyPressed(KEY_G))
 				zoom = 2;
-			zoom_x = (data_width - 1.F * window_width / zoom) / 2.F;
-			zoom_y = (data_height - 1.F * window_height / zoom) / 2.F;
+			center_zoom();
 			ImageResize(&window_image, window_width, window_height);
 			if (window_init_frames)
 				window_init_frames -= 1;