Try drawing different patterns

1 files changed, 16 insertions, 37 deletions

diff --git a/src/main.c b/src/main.c
index e8a5ea0..b8731b8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -230,56 +230,35 @@ wait_vsync() {
 int main(void) {
     set_display_mode(DISP_MODE_3 | DISP_BG2);
 
-    // Rectangle drawing testing.
-    Color clr = COLOR_WHITE;
-    for (size_t j = 0; j < SCREEN_HEIGHT; j += 8) {
-        clr = clr == COLOR_WHITE ? COLOR_BLACK : COLOR_WHITE;
-        for (size_t i = 0; i < SCREEN_WIDTH; i += 8) {
-            clr = clr == COLOR_WHITE ? COLOR_BLACK : COLOR_WHITE;
-            draw_fill_rect(i, j, 0 + i + 7, j + 7, clr);
-        }
-    }
-    clr = COLOR_GREY;
-    for (size_t j = 8; j < SCREEN_HEIGHT - 8; j += 8) {
-        for (size_t i = 8; i < SCREEN_WIDTH - 8; i += 8) {
-            draw_rect(i, j, 0 + i + 8, j + 8, clr);
+    // Draw a grid pattern.
+    for (size_t j = 30; j < SCREEN_HEIGHT - 30; j += 8) {
+        for (size_t i = 30; i < 50; i += 8) {
+            draw_rect(i, j, 0 + i + 8, j + 8, COLOR_RED);
         }
     }
 
-    // Bresenham's testing
+    // Draw the text line.
     for (size_t i = 0; i < SCREEN_WIDTH; i += 8) {
         draw_fill_rect(i, 7, 0 + i + 7, 16, COLOR_RED);
     }
-    put_text(8, 8, COLOR_BLACK, "Lines and rectangles");
+    put_text(8, 8, COLOR_BLACK, "Testing other patterns");
 
+    // Test line drawings.
     draw_fill_rect(69, 29, SCREEN_WIDTH - 69, SCREEN_HEIGHT - 29, COLOR_BLACK);
-    for (size_t i = 70; i <= SCREEN_WIDTH - 70; i += 5) {
-        int x0 = i;
-        int y0 = 30;
-        int x1 = SCREEN_WIDTH - i;
-        int y1 = SCREEN_HEIGHT - 30;
-        draw_line(x0, y0, x1, y1, COLOR_BLUE);
-    }
-    for (size_t i = 30; i <= SCREEN_HEIGHT - 30; i += 5) {
+    int step = 10;
+    for (size_t k = 0; k < (SCREEN_WIDTH - 70 - 70) / step; k++) {
         int x0 = 70;
-        int y0 = i;
-        int x1 = SCREEN_WIDTH - 70;
-        int y1 = SCREEN_HEIGHT - i;
+        int y0 = 30 + k * step;
+        int x1 = x0 + k * step + step;
+        int y1 = SCREEN_HEIGHT - 30;
         draw_line(x0, y0, x1, y1, COLOR_BLUE);
     }
-    for (size_t i = 70; i <= SCREEN_WIDTH - 70; i += 10) {
-        int x0 = i;
+    for (size_t k = 0; k < (SCREEN_WIDTH - 70 - 70) / step; k++) {
+        int x0 = 70 + k * step;
         int y0 = 30;
-        int x1 = SCREEN_WIDTH - i;
-        int y1 = SCREEN_HEIGHT - 30;
-        draw_line(x0, y0, x1, y1, COLOR_CYAN);
-    }
-    for (size_t i = 30; i <= SCREEN_HEIGHT - 30; i += 10) {
-        int x0 = 70;
-        int y0 = i;
         int x1 = SCREEN_WIDTH - 70;
-        int y1 = SCREEN_HEIGHT - i;
-        draw_line(x0, y0, x1, y1, COLOR_CYAN);
+        int y1 = y0 + k * step + step;
+        draw_line(x0, y0, x1, y1, COLOR_RED);
     }
 
     while(true) {