Created a more fluid makefile. Added documentation through doxygen.

Makefile

@@ -1,33 +1,97 @@
-# Makefile do projeto de processamento de imagem - ITP 2019.1   
+# Note:
+# Copied from: https://gist.github.com/maurizzzio/de8908f67923091982c8c8136a063ea6
+# Generic Makefile example for a C++ project
+#
+CXX ?= gcc
 
-# pastas do projeto
-SRCDIR = ./src
-INCDIR = ./include
-BINDIR = ./bin
+# path #
+SRC_PATH = src
+BUILD_PATH = build
+BIN_PATH = $(BUILD_PATH)/bin
+DOCS_PATH = docs
 
-#  compilador e flags
-CC = gcc
-CFLAGS = -Wall -lm
+# executable #
+BIN_NAME = proj
 
-# nome do projeto (executavel)
-PROJ_NAME = proj
+# extensions #
+SRC_EXT = cpp
 
-all: proj
+# code lists #
+# Find all source files in the source directory, sorted by
+# most recently modified
+SOURCES = $(shell find $(SRC_PATH) -name '*.$(SRC_EXT)' | sort -k 1nr | cut -f2-)
+# Set the object file names, with the source directory stripped
+# from the path, and the build path prepended in its place
+OBJECTS = $(SOURCES:$(SRC_PATH)/%.$(SRC_EXT)=$(BUILD_PATH)/%.o)
+# Set the dependency files that will be used to add header dependencies
+DEPS = $(OBJECTS:.o=.d)
 
-proj: bin_folder
-	$(CC) $(SRCDIR)/*.c $(CFLAGS) -I $(INCDIR) -o $(BINDIR)/$(PROJ_NAME)
-	@ln -sfv $(BINDIR)/$(PROJ_NAME) $(PROJ_NAME) # cria um link simbólico
-	@echo "Compilado com sucesso! Para executar digite ./$(PROJ_NAME) imagem.ppm"
+# flags #
+OPTIMIZE = -O03
+DEBUG = -g -D BACKTRACKING_PLAYER
+COMPILE_FLAGS = -Wall -Wextra -g -lm
+INCLUDES = -I include/
+#INCLUDES = -I include/ -I /usr/local/include
+# Space-separated pkg-config libraries used by this project
+LIBS =
+
+.PHONY: default_target
+default_target: release
+
+.PHONY: debug
+debug: export CXXFLAGS := $(CXXFLAGS) $(COMPILE_FLAGS) $(DEBUG)
+debug: dirs
+	@$(MAKE) all
 
-bin_folder:
-	@mkdir -p $(BINDIR)
+.PHONY: release
+release: export CXXFLAGS := $(CXXFLAGS) $(COMPILE_FLAGS) $(OPTIMIZE)
+release: dirs
+	@$(MAKE) all
 
+.PHONY: dirs
+dirs:
+	@echo "Creating directories"
+	@mkdir -p $(dir $(OBJECTS))
+	@mkdir -p $(BIN_PATH)
+
+.PHONY: clean
 clean:
-	@rm -f $(PROJ_NAME)
-	@rm -rf $(BINDIR)
+	@echo "Deleting $(BIN_NAME) symlink"
+	@$(RM) $(BIN_NAME)
+	@echo "Deleting directories"
+	@$(RM) -r $(BUILD_PATH)
+	@$(RM) -r $(BIN_PATH)
+	@$(RM) -r $(DOCS_PATH)
 	@echo "Binários excluidos com sucesso!"
 
+# checks the executable and symlinks to the output
+.PHONY: all
+all: project docs
+
+.PHONY: project
+project: $(BIN_PATH)/$(BIN_NAME)
+	@echo "Making symlink: $(BIN_NAME) -> $<"
+	@$(RM) $(BIN_NAME)
+	@ln -s $(BIN_PATH)/$(BIN_NAME) $(BIN_NAME)
+	@echo "Compilado com sucesso! Para executar digite ./$(PROJ_NAME) imagem.ppm"
 
+# Creation of the executable
+$(BIN_PATH)/$(BIN_NAME): $(OBJECTS)
+	@echo " "
+	@echo "Linking: $@"
+	$(CXX) $(OBJECTS) -o $@
 
+# Add dependency files, if they exist
+-include $(DEPS)
 
+# Creates a Doxygen file
+docs:
+	@echo "Generating Documentation"
+	@doxygen config
 
+# Source file rules
+# After the first compilation they will be joined with the rules from the
+# dependency files to provide header dependencies
+$(BUILD_PATH)/%.o: $(SRC_PATH)/%.$(SRC_EXT)
+	@echo "Compiling: $< -> $@"
+	$(CXX) $(CXXFLAGS) $(INCLUDES) -MP -MMD -c $< -o $@