feat: place brick on previews

1 files changed, 63 insertions, 32 deletions

diff --git a/game.c b/game.c
index a34aafc..cf6a394 100644
--- a/game.c
+++ b/game.c
@@ -23,6 +23,9 @@ size_t hand_count = 0;
 struct brick active = {0};
 int has_active = 0;
 
+struct brick preview[256] = {0};
+size_t preview_count = 0;
+
 struct eye direction[4] = {
   {.x =  0, .y = -1},
   {.x = -2, .y =  0},
@@ -30,6 +33,39 @@ struct eye direction[4] = {
   {.x =  0, .y =  1},
 };
 
+void get_prewiews() {
+  preview_count = 0;
+  for (size_t i = 0; i < bricks.count * 2; i++) {
+    struct eye e = bricks.items.eye[i];
+    if (e.val != active.front.val) continue;
+
+    struct brick p = active;
+    p.front.x = e.x;
+    p.front.y = e.y;
+    p.back.x = e.x + 1;
+    p.back.y = e.y;
+    struct brick previews[4] = {p, p, p, p};
+    for (size_t ii = 0; ii < 4; ii++) {
+      previews[ii].front.x += direction[ii].x;
+      previews[ii].front.y += direction[ii].y;
+      previews[ii].front.val = 0;
+
+      previews[ii].back.x += direction[ii].x;
+      previews[ii].back.y += direction[ii].y;
+
+      for (size_t iii = 0; iii < bricks.count * 2; iii++) {
+        previews[ii].front.val |= ((bricks.items.eye[iii].x == previews[ii].back.x && bricks.items.eye[iii].y == previews[ii].back.y) ||
+            (bricks.items.eye[iii].x == previews[ii].front.x && bricks.items.eye[iii].y == previews[ii].front.y));
+      }
+    }
+
+    for (size_t ii = 0; ii < 4; ii++) {
+      if (!previews[ii].front.val)
+        preview[preview_count++] = previews[ii];
+    }
+  }
+}
+
 void key_callback(int key, int scancode, int action, int mods) {
   if (action != GLFW_PRESS) return;
   switch (key) {
@@ -47,6 +83,7 @@ void cursor_position_callback(int xpos, int ypos) {
 
 void mouse_button_callback(int button, int action, int mods) {
   if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_PRESS) {
+    // pick up brick from hand
     for (size_t i = 0; i < hand_count; i++) {
       struct brick *b = &hand[i];
       if (!has_active) {
@@ -62,14 +99,36 @@ void mouse_button_callback(int button, int action, int mods) {
         hand[i - 1] = hand[i];
       }
     }
-    if (has_active) hand_count--;
+    if (has_active) {
+      hand_count--;
+      get_prewiews();
+    }
   }
 
   printf("click!\n");
   if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_RELEASE) {
     if (has_active) {
       has_active = 0;
-      hand[hand_count++] = active;
+
+      size_t min_dist = -1;
+      for (size_t i = 0; i < preview_count; i++) {
+        int active_x = active.front.x + mouse_x + DOMINO_WIDTH / 2;
+        int active_y = active.front.y + mouse_y + DOMINO_HEIGHT / 2;
+        int preview_x = preview[i].front.x * EYE_SIZE + DOMINO_WIDTH / 2;
+        int preview_y = preview[i].front.y * EYE_SIZE + DOMINO_HEIGHT / 2;
+        preview[i].front.val = (active_x - preview_x) * (active_x - preview_x) + (active_y - preview_y) * (active_y - preview_y);
+        if (min_dist == (size_t)-1) min_dist = 1;
+        if (preview[i].front.val < preview[min_dist].front.val) min_dist = i;
+      }
+
+      if (preview[min_dist].front.val < EYE_SIZE * EYE_SIZE && preview_count) {
+        preview[min_dist].front.val = active.front.val;
+        preview[min_dist].back.val = active.back.val;
+        bricks_append(&bricks, preview[min_dist]);
+      } else {
+        hand[hand_count++] = active;
+      }
+      preview_count = 0;
     }
   }
 
@@ -160,36 +219,8 @@ void render(struct image canvas) {
     draw(canvas, red_and_peach_dominoes[b->back.val][b->front.val], b->front.x * EYE_SIZE, b->front.y * EYE_SIZE);
   }
 
-  if (has_active) {
-    for (size_t i = 0; i < bricks.count * 2; i++) {
-      struct eye e = bricks.items.eye[i];
-      if (e.val != active.front.val) continue;
-
-      struct brick p = active;
-      p.front.x = e.x;
-      p.front.y = e.y;
-      p.back.x = e.x + 1;
-      p.back.y = e.y;
-      struct brick previews[4] = {p, p, p, p};
-      for (size_t ii = 0; ii < 4; ii++) {
-        previews[ii].front.x += direction[ii].x;
-        previews[ii].front.y += direction[ii].y;
-        previews[ii].front.val = 0;
-
-        previews[ii].back.x += direction[ii].x;
-        previews[ii].back.y += direction[ii].y;
-
-        for (size_t iii = 0; iii < bricks.count * 2; iii++) {
-          previews[ii].front.val |= ((bricks.items.eye[iii].x == previews[ii].back.x && bricks.items.eye[iii].y == previews[ii].back.y) ||
-              (bricks.items.eye[iii].x == previews[ii].front.x && bricks.items.eye[iii].y == previews[ii].front.y));
-        }
-      }
-
-      for (size_t ii = 0; ii < 4; ii++) {
-        if (!previews[ii].front.val)
-          draw(canvas, white_and_blue_dominoes[active.back.val][active.front.val], previews[ii].front.x * EYE_SIZE, previews[ii].front.y * EYE_SIZE);
-      }
-    }
+  for (size_t i = 0; i < preview_count; i++) {
+    draw(canvas, white_and_blue_dominoes[active.back.val][active.front.val], preview[i].front.x * EYE_SIZE, preview[i].front.y * EYE_SIZE);
   }
 
   // hand