Make the demo feature the buttons a bit and add more color.

1 files changed, 25 insertions, 9 deletions

diff --git a/main/main.c b/main/main.c
index 0257429..f7edfef 100644
--- a/main/main.c
+++ b/main/main.c
@@ -11,13 +11,13 @@
 #include "freertos/queue.h"
 #include "esp_system.h"
 
-static pax_buf_t pax_buffer;
+static pax_buf_t buf;
 xQueueHandle buttonQueue;
 
 static const char *TAG = "mch2022-demo-app";
 
 void disp_flush() {
-    ili9341_write(get_ili9341(), pax_buffer.buf);
+    ili9341_write(get_ili9341(), buf.buf);
 }
 
 void app_main() {
@@ -27,12 +27,28 @@ void app_main() {
     buttonQueue = get_rp2040()->queue;
     
     // Init GFX.
-    pax_buf_init(&pax_buffer, NULL, 320, 240, PAX_BUF_16_565RGB);
+    pax_buf_init(&buf, NULL, 320, 240, PAX_BUF_16_565RGB);
     
-    // Show some hello world.
-    pax_background(&pax_buffer, 0xffff00ff);
-    disp_flush();
-    
-    // Just wait.
-    while (1) vTaskDelay(10000);
+    while (1) {
+        // Pick a random background color.
+        int hue = esp_random() & 255;
+        pax_col_t col = pax_col_hsv(hue, 255 /*saturation*/, 255 /*brighness*/);
+        
+        // Show some random color hello world.
+        pax_background(&buf, col);
+        char             *text = "Hello, World!";
+        const pax_font_t *font = pax_get_font("saira condensed");
+        pax_vec1_t        dims = pax_text_size(font, font->default_size, text);
+        pax_draw_text(
+            &buf, 0xff000000, font, font->default_size,
+            (buf.width  - dims.x) / 2.0,
+            (buf.height - dims.y) / 2.0,
+            text
+        );
+        disp_flush();
+        
+        // Await any button press and do another cycle.
+        rp2040_input_message_t message;
+        xQueueReceive(buttonQueue, &message, portMAX_DELAY);
+    }
 }