Introducing ChatBalloon #13 [ci skip]

src/ui/chatballoon.cpp

@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+ * If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This Source Code Form is "Incompatible With Secondary Licenses",
+ * as defined by the Mozilla Public License, v. 2.0.
+ */ 
+
+#include <SDL2/SDL_ttf.h>
+#include <SDL2/SDL2_gfxPrimitives.h>
+#include "chatballoon.hpp"
+using namespace std;
+
+/**
+ * Constructor
+ * \param text message to display
+ * \param x x coord of the tip (bottom) of the balloon
+ * \param y y coord of the tip (bottom) of the balloon
+ */
+ChatBalloon::ChatBalloon(const string &text, const int x, const int y) : message(text), 
+_x(x), _y(y), nbCharsDisplayed(1), creationTime(SDL_GetTicks()) {
+    if(message.size() == 0) {
+        message = " ";
+    }
+}
+
+ChatBalloon::~ChatBalloon() {
+
+}
+
+void ChatBalloon::draw(SDL_Renderer *renderer) {
+    if(nbCharsDisplayed < message.size()) {
+        Uint32 delta = SDL_GetTicks() - creationTime;
+        nbCharsDisplayed = 1 + delta / (1000 / CHARACTERS_PER_SECOND);
+    }
+
+    int textWidth = nbCharsDisplayed >= BALLOON_WIDTH ? BALLOON_WIDTH : nbCharsDisplayed;
+    int nbLines = 1 + nbCharsDisplayed / BALLOON_WIDTH;
+    if(nbCharsDisplayed % BALLOON_WIDTH == 0) {
+        nbLines -= 1;
+    }
+
+    // Draw tip
+    filledTrigonRGBA(renderer, _x, _y, _x + 10, _y - 10, _x - 10, _y - 10, 0xff, 0xff, 0xff, 0xff);
+
+    // Draw balloon
+
+    // Draw text, line by line
+
+}
+
+bool ChatBalloon::isVisible() const {
+    return SDL_Ticks() <= creationTime + FULL_DELAY + (message.size() - 1) * 1000 / CHARACTERS_PER_SECOND;
+}

src/ui/chatballoon.hpp

@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+ * If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This Source Code Form is "Incompatible With Secondary Licenses",
+ * as defined by the Mozilla Public License, v. 2.0.
+ */
+
+#include <SDL2/SDL.h>
+#include <string>
+
+#ifndef _H_CHATBALLOON_
+#define _H_CHATBALLOON_
+
+class ChatBalloon final {
+public:
+    const int BALLOON_WIDTH = 20; //! in characters
+    const int CHARACTERS_PER_SECOND = 10; //! used when deploying the balloon
+    const Uint32 FULL_DELAY = 5000; //! time to leave the full balloon visible
+
+    ChatBalloon(const std::string &text, const int x, const int y);
+    ~ChatBalloon();
+
+    void draw(SDL_Renderer *renderer);
+    bool isVisible() const;
+
+private:
+    std::string message;
+    int _x;
+    int _y;
+    int nbCharsDisplayed;
+    Uint32 creationTime;
+
+    const int PADDING = 5; //! in pixels
+};
+
+#endif // _H_CHATBALLOON_