Added animation system

1 files changed, 122 insertions, 0 deletions

@@ -0,0 +1,122 @@
+#include "animation_system.h"
+#include <fstream>
+#include <string>
+#include <list>
+#include "game.h"
+#include "vector.h"
+#include "util.h"
+
+void AnimationSystem::initSprite(int spriteId, std::string_view filename, Renderer& renderer) {
+  std::ifstream datafile(filename.data());
+  if (!datafile.is_open()) {
+    throw std::invalid_argument(std::string("Could not find sprite datafile: ") + std::string(filename));
+  }
+
+  Sprite& sprite = game_.getSprite(spriteId);
+  sprite.isAnimated = true;
+
+  char ch;
+  std::string line;
+
+  std::string imagename;
+  datafile >> imagename;
+  sprite.textureId = renderer.loadImageFromFile(imagename);
+
+  std::string framefilename;
+  datafile >> framefilename;
+
+  std::ifstream framefile(framefilename);
+  if (!framefile.is_open()) {
+    throw std::invalid_argument("Could not find frame datafile: " + framefilename);
+  }
+
+  vec2i cellSize;
+  framefile >> cellSize.w();
+  framefile >> ch; //,
+  framefile >> cellSize.h();
+  std::getline(framefile, line); // cell size
+
+  int framesPerRow;
+  framefile >> framesPerRow;
+  std::getline(framefile, line); // frames per row
+
+  int numFrames;
+  framefile >> numFrames;
+  std::getline(framefile, line); // frames
+  std::getline(framefile, line); // blank
+
+  for (int i=0; i<numFrames; i++) {
+    SpriteFrame f;
+    framefile >> f.size.w();
+    framefile >> ch; //,
+    framefile >> f.size.h();
+    framefile >> ch; //,
+    framefile >> f.center.x();
+    framefile >> ch; //,
+    framefile >> f.center.y();
+    std::getline(framefile, line); // blank
+
+    f.srcRect.x = (i % framesPerRow) * cellSize.w();
+    f.srcRect.y = (i / framesPerRow) * cellSize.h();
+    f.srcRect.w = f.size.w();
+    f.srcRect.h = f.size.h();
+
+    sprite.frames.push_back(std::move(f));
+  }
+
+  std::string animLine;
+  std::getline(datafile, animLine); // blank
+  while (std::getline(datafile, animLine)) {
+    std::regex re(R"(([a-z]+)\[([a-z_]+)\]: ([0-9,]+))");
+    std::smatch m;
+    std::regex_match(animLine, m, re);
+
+    std::vector<int> frames;
+    auto framestrs = splitStr<std::list<std::string>>(m[3], ",");
+    for (const std::string& f : framestrs) {
+      frames.push_back(std::stoi(f));
+    }
+
+    int animId = sprite.animations.size();
+    sprite.animations.push_back(std::move(frames));
+
+    Direction dir = directionFromString(std::string(m[2]));
+    sprite.nameDirToAnim[m[1]][dir] = animId;
+  }
+
+  updateAnimation(spriteId);
+}
+
+void AnimationSystem::tick(double dt) {
+  animTimer_.accumulate(dt);
+  while (animTimer_.step()) {
+    for (Sprite& sprite : game_.getSprites() | game_.spriteView()) {
+      sprite.animationFrame++;
+      if (sprite.animationFrame >= sprite.animations[sprite.animationId].size()) {
+        sprite.animationFrame = 0;
+      }
+    }
+  }
+}
+
+void AnimationSystem::setSpriteDirection(int spriteId, Direction dir) {
+  Sprite& sprite = game_.getSprite(spriteId);
+  if (sprite.dir != dir) {
+    sprite.dir = dir;
+    updateAnimation(spriteId);
+  }
+}
+
+void AnimationSystem::setSpriteAnimation(int spriteId, std::string_view name) {
+  Sprite& sprite = game_.getSprite(spriteId);
+  if (sprite.animationName != name) {
+    sprite.animationName = name;
+    updateAnimation(spriteId);
+  }
+}
+
+void AnimationSystem::updateAnimation(int spriteId) {
+  Sprite& sprite = game_.getSprite(spriteId);
+  sprite.animationId = sprite.nameDirToAnim[sprite.animationName][sprite.dir];
+  sprite.animationFrame = 0;
+}