rotated iamges

5 files changed, 76 insertions, 11 deletions

diff --git a/dc/dc.c b/dc/dc.c
index b0e7b60..adecb4e 100644
--- a/dc/dc.c
+++ b/dc/dc.c
@@ -24,11 +24,19 @@ void tick(void)
     ty_draw_image(
         img,
         ty_vec2i(
-            SCREEN_WIDTH*0.5 + sin(ty_get_time() * 10) * 50 - (img.width*0.5),
+            SCREEN_WIDTH*0.5 + sin(ty_get_time()) * 50 - (img.width*0.5),
             SCREEN_HEIGHT*0.5 - (img.height*0.5)
         )
     );
 
+    ty_draw_image_rot(
+        img,
+        ty_vec2i(SCREEN_WIDTH/2, SCREEN_HEIGHT/2),
+        ty_vec2i(-img.width/2, -img.height/2),
+        TY_PI / 4
+        //ty_get_time()
+    );
+
     ty_draw_text(&font, ty_vec2i(5, SCREEN_HEIGHT - 5 - 8), "hello, world!");
 
     double frame_time = ty_get_time() - last_frame;
@@ -74,6 +82,10 @@ void tick(void)
     );
     y += 8;
     ty_draw_text(&font, ty_vec2i(5, y), 
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    );
+    y += 8;
+    ty_draw_text(&font, ty_vec2i(5, y), 
         "0123456789"
     );
     y += 8;
@@ -84,6 +96,15 @@ void tick(void)
     ty_draw_text(&font, ty_vec2i(5, y), 
         "^_`{}|~:;<>=? "
     );
+    y += 8;
+    ty_draw_text(&font, ty_vec2i(5, y), 
+        "THe_value = MY_arr[15]"
+    );
+    y += 8;
+    ty_draw_text_fmt(&font, ty_vec2i(5, y), 
+        "%.2g",
+        ty_get_time()
+    );
 
     ty_draw_end();
 
@@ -128,12 +149,11 @@ int main(void)
             font_img.data + font_img.width * glyph_height * i
         );
 
+        uint8_t c = *(uint8_t*)&font_chars[i];
 
-        ty_font_add_glyph(
-            &font,
-            *(uint8_t*)&font_chars[i],
-            glyph
-        );
+        ty_font_add_glyph(&font, c, glyph);
+        if (c >= 'a' && c <= 'z')
+            ty_font_add_glyph(&font, c - ('a' - 'A'), glyph);
     }
 
     while (ty_is_game_running()) {
diff --git a/font.qoi b/font.qoi
index 429d7da..36d6149 100644
--- a/font.qoi
+++ b/font.qoi
diff --git a/teensy/teensy.h b/teensy/teensy.h
index 0b7829c..cf0479f 100644
--- a/teensy/teensy.h
+++ b/teensy/teensy.h
@@ -108,6 +108,12 @@ void ty_draw_image_ex(
     struct ty_recti src,
     struct ty_recti dst
 );
+void ty_draw_image_rot(
+    struct ty_image img,
+    struct ty_vec2i pos,
+    struct ty_vec2i offset,
+    double rot
+);
 void ty_draw_rect(struct ty_recti rect, struct ty_color color);
 void ty_draw_line(
     struct ty_vec2i start,
diff --git a/teensy/teensy_common.h b/teensy/teensy_common.h
index dc631cb..ea52982 100644
--- a/teensy/teensy_common.h
+++ b/teensy/teensy_common.h
@@ -9,7 +9,9 @@
 #include "teensy_log.h"
 #include "teensy_mem.h"
 
-#define TY_PI 3.14
+#define TY_PI  (3.1415926535897932384626433)
+#define TY_TAU (TY_PI * 2)
 #define TY_DEG2RAD (180 / PI)
+#define TY_RAD2DEG (PI / 180)
 
 #endif // TEENSY_COMMON_H_
diff --git a/teensy/teensy_renderer.c b/teensy/teensy_renderer.c
index d3f73fd..2104695 100644
--- a/teensy/teensy_renderer.c
+++ b/teensy/teensy_renderer.c
@@ -178,13 +178,50 @@ void ty_draw_image_ex(
     }
 }
 
+struct ty_vec2i clamp_point(struct ty_vec2i p, struct ty_recti rect)
+{
+    p.x = fmin(fmax(p.x, rect.x), rect.w);
+    p.y = fmin(fmax(p.y, rect.y), rect.h);
+    return p;
+}
+
+void ty_draw_image_rot(
+    struct ty_image img,
+    struct ty_vec2i pos,
+    struct ty_vec2i offset,
+    double rot
+) {
+    double s = sin(rot);
+    double c = cos(rot);
+ 
+    // x1 = c*x - s*y
+    // y1 = s*x + c*y
+
+    // FIXME: the corners of the rotated image get cut off.
+    for (int img_y = 0; img_y < img.height; img_y++) {
+        for (int img_x = 0; img_x < img.width; img_x++) {
+            double pixel_x = img_x + offset.x;
+            double pixel_y = img_y + offset.y;
+
+            int dx = floor(pixel_x * c - pixel_y * s - offset.x);
+            int dy = floor(pixel_x * s + pixel_y * c - offset.y);
+
+            if (dx < 0 || dx >= img.width || dy < 0 || dy >= img.height)
+                continue;
+
+            struct ty_color px = ty_img_get_pixel(img, ty_vec2i(dx, dy));
+            ty_img_set_pixel(r.screen, ty_vec2i(pos.x + img_x, pos.y + img_y), px);
+        }
+    }
+}
+
 void ty_draw_rect(struct ty_recti rect, struct ty_color color)
 {
-    int x1 = fmin(fmax(floor(rect.x), 0), r.screen.width);
-    int y1 = fmin(fmax(floor(rect.y), 0), r.screen.height);
+    int x1 = fmin(fmax(rect.x, 0), r.screen.width);
+    int y1 = fmin(fmax(rect.y, 0), r.screen.height);
 
-    int x2 = fmin(fmax(floor(rect.x + rect.w), 0), r.screen.width);
-    int y2 = fmin(fmax(floor(rect.y + rect.h), 0), r.screen.height);
+    int x2 = fmin(fmax(rect.x + rect.w, 0), r.screen.width);
+    int y2 = fmin(fmax(rect.y + rect.h, 0), r.screen.height);
 
     for (int dy = y1; dy < y2; dy++) {
         for (int dx = x1; dx < x2; dx++) {