testmouse: Allow drawing rectangles as well as lines

test/testmouse.c

@@ -28,16 +28,19 @@
 
 static SDL_Window *window;
 
-typedef struct _Line {
-    struct _Line *next;
+typedef struct _Object {
+    struct _Object *next;
 
     int x1, y1, x2, y2;
     Uint8 r, g, b;
-} Line;
 
-static Line *active = NULL;
-static Line *lines = NULL;
+    SDL_bool isRect;
+} Object;
+
+static Object *active = NULL;
+static Object *objects = NULL;
 static int buttons = 0;
+static SDL_bool isRect = SDL_FALSE;
 
 static SDL_bool wheel_x_active = SDL_FALSE;
 static SDL_bool wheel_y_active = SDL_FALSE;
@@ -47,33 +50,57 @@ static float wheel_y = SCREEN_HEIGHT * 0.5f;
 static SDL_bool done = SDL_FALSE;
 
 void
-DrawLine(SDL_Renderer * renderer, Line * line)
+DrawObject(SDL_Renderer * renderer, Object * object)
 {
-    SDL_SetRenderDrawColor(renderer, line->r, line->g, line->b, 255);
-    SDL_RenderDrawLine(renderer, line->x1, line->y1, line->x2, line->y2);
+    SDL_SetRenderDrawColor(renderer, object->r, object->g, object->b, 255);
+
+    if (object->isRect) {
+        SDL_Rect rect;
+
+        if (object->x1 > object->x2) {
+            rect.x = object->x2;
+            rect.w = object->x1 - object->x2;
+        } else {
+            rect.x = object->x1;
+            rect.w = object->x2 - object->x1;
+        }
+
+        if (object->y1 > object->y2) {
+            rect.y = object->y2;
+            rect.h = object->y1 - object->y2;
+        } else {
+            rect.y = object->y1;
+            rect.h = object->y2 - object->y1;
+        }
+
+        /* SDL_RenderDrawRect(renderer, &rect); */
+        SDL_RenderFillRect(renderer, &rect);
+    } else {
+        SDL_RenderDrawLine(renderer, object->x1, object->y1, object->x2, object->y2);
+    }
 }
 
 void
-DrawLines(SDL_Renderer * renderer)
+DrawObjects(SDL_Renderer * renderer)
 {
-    Line *next = lines;
+    Object *next = objects;
     while (next != NULL) {
-        DrawLine(renderer, next);
+        DrawObject(renderer, next);
         next = next->next;
     }
 }
 
 void
-AppendLine(Line *line)
+AppendObject(Object *object)
 {
-    if (lines) {
-        Line *next = lines;
+    if (objects) {
+        Object *next = objects;
         while (next->next != NULL) {
             next = next->next;
         }
-        next->next = line;
+        next->next = object;
     } else {
-        lines = line;
+        objects = object;
     }
 }
 
@@ -118,6 +145,7 @@ loop(void *arg)
                 active = SDL_calloc(1, sizeof(*active));
                 active->x1 = active->x2 = event.button.x;
                 active->y1 = active->y2 = event.button.y;
+                active->isRect = isRect;
             }
 
             switch (event.button.button) {
@@ -128,6 +156,7 @@ loop(void *arg)
             case SDL_BUTTON_X2:     active->g = 255; active->b = 255; buttons |= SDL_BUTTON_X2MASK; break;
             }
             break;
+
         case SDL_MOUSEBUTTONUP:
             if (!active)
                 break;
@@ -141,11 +170,23 @@ loop(void *arg)
             }
 
             if (buttons == 0) {
-                AppendLine(active);
+                AppendObject(active);
                 active = NULL;
             }
             break;
 
+        case SDL_KEYDOWN:
+        case SDL_KEYUP:
+            switch (event.key.keysym.sym) {
+            case SDLK_LSHIFT:
+                isRect = (event.key.state == SDL_PRESSED);
+                if (active) {
+                    active->isRect = isRect;
+                }
+                break;
+            }
+            break;
+
         case SDL_QUIT:
             done = SDL_TRUE;
             break;
@@ -167,10 +208,10 @@ loop(void *arg)
             SDL_RenderDrawLine(renderer, 0, wheel_y, SCREEN_WIDTH, wheel_y);
     }
 
-    /* Lines from mouse clicks */
-    DrawLines(renderer);
+    /* Objects from mouse clicks */
+    DrawObjects(renderer);
     if (active)
-        DrawLine(renderer, active);
+        DrawObject(renderer, active);
 
     SDL_RenderPresent(renderer);