New base class: Sprite #8

src/sprite.cpp

@@ -0,0 +1,65 @@
+/* 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_image.h>
+#include "sprite.hpp"
+using namespace std;
+
+Sprite::Sprite(const std::string filename, const int width, const int height, const Uint16 duration) {
+
+	surface = IMG_Load(filename.c_str());
+	SDL_SetColorKey(surface, SDL_RLEACCEL, SDL_MapRGB(surface->format, 0xff, 0, 0xff));
+
+	nbStates = surface->h / height;
+	nbSteps = surface->w / width;
+	currentState = 0;
+	stepDuration = duration;
+
+	currentRect.x = 0;
+	currentRect.y = 0;
+	currentRect.h = height;
+	currentRect.w = width;
+
+	creationTS = SDL_GetTicks();
+}
+
+Sprite::~Sprite() {
+	SDL_FreeSurface(surface);
+}
+
+/**
+ * Get the rectangle corresponding to the current animation step for this sprite
+ * Used in conjunction with getSurface() to actually draw it to the screen
+ */
+SDL_Rect & Sprite::getRect() {
+	currentRect.y = currentState * currentRect.h;
+	// Find, given current time, at which step we are
+	Uint32 current = (SDL_GetTicks() - creationTS) % (stepDuration * nbSteps);
+	currentRect.x = currentRect.w * (current / nbSteps);
+
+	return currentRect;
+}
+
+/**
+ * Get the underlying SDL_Surface
+ */
+SDL_Surface * Sprite::getSurface() {
+	return surface;
+}
+
+/**
+ * Change the state of this Sprite
+ */
+void Sprite::setState(const int newState) {
+	if (newState >= 0 && newState < nbStates) {
+		currentState = newState;
+	}
+	else {
+		currentState = 0;
+	}
+}

src/sprite.hpp

@@ -0,0 +1,35 @@
+/* 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.
+ */
+
+#ifndef _H_SPRITE_
+#define _H_SPRITE_
+
+#include <string>
+#include <SDL2/SDL.h>
+
+class Sprite {
+public:
+	Sprite(const std::string filename, const int width, const int height, const Uint16 duration);
+	~Sprite();
+
+	SDL_Rect & getRect();
+	SDL_Surface* getSurface();
+	void setState(const int newState);
+
+private:
+	SDL_Rect currentRect;
+	SDL_Surface *surface = nullptr;
+	int nbSteps;
+	int nbStates;
+	int currentState;
+	Uint16 stepDuration;
+	Uint32 creationTS;  //! timestamp of creation
+};
+
+#endif // ! _H_SPRITE_
+