From e5b2b11ec020494d5bc6fb577f444d2b874a8bed Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Sat, 25 May 2019 21:30:31 -0500
Subject: [PATCH] Why have I forgotten trigonometry again

---
 examples/cluster.c        | 39 +++++++++++++++++++++++++++++++++++----
 include/hexagram/module.h |  2 --
 src/module.c              | 12 +++---------
 3 files changed, 38 insertions(+), 15 deletions(-)

diff --git a/examples/cluster.c b/examples/cluster.c
index 9f7eebb..83baf21 100644
--- a/examples/cluster.c
+++ b/examples/cluster.c
@@ -6,8 +6,9 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 
-static void redraw(cairo_surface_t *sfc, cairo_t *ctx) {
+static void redraw(cairo_t *ctx) {
     /*
      * Paint canvas black
      */
@@ -27,10 +28,10 @@ static void redraw(cairo_surface_t *sfc, cairo_t *ctx) {
     /*
      * Draw two smaller circles
      */
-    cairo_arc(ctx, 442, 368, 64, 0, 360);
+    cairo_arc(ctx, 442, 368, 64, 0, 360 * (M_PI/180));
     cairo_stroke(ctx);
 
-    cairo_arc(ctx, 578, 368, 64, 0, 360);
+    cairo_arc(ctx, 582, 368, 64, 0, 360 * (M_PI/180));
     cairo_stroke(ctx);
 
     /*
@@ -41,9 +42,38 @@ static void redraw(cairo_surface_t *sfc, cairo_t *ctx) {
     cairo_line_to(ctx, 592, 288);
     cairo_line_to(ctx, 432, 288);
     cairo_line_to(ctx, 432, 48);
+    cairo_set_source_rgb(ctx, 0.75, 0, 0);
+    cairo_fill(ctx);
+
+    cairo_move_to(ctx, 432, 48);
+    cairo_line_to(ctx, 592, 48);
+    cairo_line_to(ctx, 592, 288);
+    cairo_line_to(ctx, 432, 288);
+    cairo_line_to(ctx, 432, 48);
+    cairo_set_source_rgb(ctx, 1, 1, 1);
     cairo_stroke(ctx);
 }
 
+static void draw_text(cairo_t *cr) {
+    cairo_select_font_face(cr, "Helvetica",
+      CAIRO_FONT_SLANT_NORMAL,
+      CAIRO_FONT_WEIGHT_NORMAL);
+
+    cairo_set_font_size(cr, 13);
+
+    cairo_move_to(cr, 208 + 192, 240);
+    cairo_save(cr);
+    cairo_rotate(cr, 45.0 * (M_PI/180));
+    cairo_show_text(cr, "10");
+    cairo_restore(cr);
+
+    cairo_move_to(cr, 208, 240 + 192);
+    cairo_save(cr);
+    cairo_rotate(cr, 90.0 * (M_PI/180));
+    cairo_show_text(cr, "20");
+    cairo_restore(cr);
+}
+
 int main(int argc, char **argv) {
     Display *display;
     Window win;
@@ -79,7 +109,8 @@ int main(int argc, char **argv) {
 
     ctx = cairo_create(sfc);
 
-    redraw(sfc, ctx);
+    redraw(ctx);
+    draw_text(ctx);
 
     while (1) {
         XExposeEvent *expose;
diff --git a/include/hexagram/module.h b/include/hexagram/module.h
index a1451d8..0985e87 100644
--- a/include/hexagram/module.h
+++ b/include/hexagram/module.h
@@ -14,8 +14,6 @@ int hexagram_module_close(hexagram_module *module);
 
 const char *hexagram_module_name(hexagram_module *module);
 
-int hexagram_module_win(hexagram_module *module);
-
 int hexagram_module_run(hexagram_module *module,
                         hexagram_dict *buses);
 
diff --git a/src/module.c b/src/module.c
index c4a93d7..b7bd9e5 100644
--- a/src/module.c
+++ b/src/module.c
@@ -5,13 +5,15 @@
 #include <dlfcn.h>
 #include <sys/wait.h>
 
+#include <X11/Xlib.h>
+
 #include <hexagram/module.h>
+#include <hexagram/window.h>
 
 struct _hexagram_module {
     const char *soname;
     void *handle;
     char *(*name)();
-    int (*win)();
     int (*run)(hexagram_dict *buses);
     pid_t pid;
 };
@@ -58,14 +60,6 @@ const char *hexagram_module_name(hexagram_module *module) {
     return module->name();
 }
 
-int hexagram_module_win(hexagram_module *module) {
-    if (module->win == NULL) {
-        return -1;
-    }
-
-    return module->win();
-}
-
 int hexagram_module_run(hexagram_module *module,
                         hexagram_dict *buses) {
     if (module->run == NULL) {