Draw rays from camera and call ray casting stub function.

camera.cpp

@@ -1,24 +1,57 @@
 #include "camera.h"
-#include <cmath>
 
-#include <SFML/Graphics/Color.hpp>
+#include <cmath>
+#include "level.h"
 
 #define PI 3.14159265
+#define DEG_RAD PI/180.f
+#define ROTATION_SPEED 180
+#define TRANSLATIONAL_SPEED 100.f
 
+static void draw(Camera* camera, sf::RenderWindow* window);
+static void drawRays(Camera* camera, sf::RenderWindow* window);
 static void drawLine(sf::RenderWindow* window, sf::Vector2f pos, float angle, float length, sf::Color color);
+static void move(Camera* camera, float t);
 
-void camera_update(Camera* camera, sf::RenderWindow* window)
+void camera_update(Camera* camera, sf::RenderWindow* window, float t)
 {
 	if (!camera || !window) return; 
 
+	draw(camera, window);
+	move(camera, t);
+}
+
+static void draw(Camera* camera, sf::RenderWindow* window)
+{
+	const float circleRadius = 5.f;
+	sf::CircleShape circle(circleRadius);
+	circle.setPosition(camera->pos);
+	circle.setOrigin(circleRadius, circleRadius);
+	circle.setFillColor(sf::Color::Green);
+
+	drawRays(camera, window);
 	drawLine(window, camera->pos, camera->direction, 100, sf::Color::Red);
+	window->draw(circle);
+}
+
+static void drawRays(Camera* camera, sf::RenderWindow* window)
+{
+	float halfFOV = camera->fov/2.f;
+	float rayDirection = camera->direction - halfFOV;
+	float rayDirectionStep = camera->fov / (float)camera->resolution;
+
+	for (unsigned int i = 0; i < camera->resolution; i++) {
+		float distance = level_rayCastDistance(camera->pos, rayDirection);
+		drawLine(window, camera->pos, rayDirection, distance, sf::Color::Blue);
+		rayDirection += rayDirectionStep;
+	}
 }
 
 static void drawLine(sf::RenderWindow* window, sf::Vector2f pos, float angle, float length, sf::Color color)
 {
 	if (!window) return;
 
-	sf::Vector2f endOffset(length * cos(angle * PI/180.f), length * sin(angle * PI/180.3));
+	sf::Vector2f endOffset(length * cos(angle * DEG_RAD), length * sin(angle * DEG_RAD));
 	sf::Vertex start(pos);
 	sf::Vertex end(pos + endOffset);
 
@@ -29,3 +62,23 @@ static void drawLine(sf::RenderWindow* window, sf::Vector2f pos, float angle, fl
 
 	window->draw(line, 2, sf::Lines);
 }
+
+static void move(Camera* camera, float t)
+{
+	int forward = 0;
+	int rotation = 0;
+	if (sf::Keyboard::isKeyPressed(sf::Keyboard::F))
+		forward += 1;
+	if (sf::Keyboard::isKeyPressed(sf::Keyboard::S))
+		forward -= 1;
+	if (sf::Keyboard::isKeyPressed(sf::Keyboard::T))
+		rotation +=1;
+	if (sf::Keyboard::isKeyPressed(sf::Keyboard::R))
+		rotation -=1;
+
+	float magnitude = forward * t * TRANSLATIONAL_SPEED;
+	sf::Vector2f offset(magnitude * cos(camera->direction * DEG_RAD), magnitude *sin(camera->direction * DEG_RAD));
+
+	camera->pos += offset;
+	camera->direction += rotation * t * ROTATION_SPEED;
+}

camera.h

@@ -1,17 +1,16 @@
 #ifndef CAMERA_H
 #define CAMERA_H
 
-#include <SFML/Graphics/RenderWindow.hpp>
-#include <SFML/System/Vector2.hpp>
+#include <SFML/Graphics.hpp>
 
 typedef struct
 {
 	sf::Vector2f pos;
 	float direction;
-	float resolution;
+	unsigned int resolution;
 	float fov;
 } Camera;
 
-void camera_update(Camera* camera, sf::RenderWindow* window);
+void camera_update(Camera* camera, sf::RenderWindow* window, float t);
 
 #endif

level.cpp

@@ -12,9 +12,9 @@ static sf::RenderWindow* window = nullptr;
 
 static unsigned int level[WIDTH * HEIGHT] = {
 	1, 1, 1, 1, 1,
-	0, 0, 0, 0, 0,
+	1, 0, 0, 0, 0,
 	1, 0, 1, 0, 1,
-	0, 0, 0, 0, 0,
+	1, 0, 0, 0, 0,
 	1, 0, 1, 0, 1,
 };
 
@@ -38,26 +38,30 @@ void level_end()
 	return;
 }
 
+float level_rayCastDistance(sf::Vector2f point, float direction)
+{
+	return 100.f;
+}
+
 static void drawGrid()
 {
 	const sf::Vector2u windowSize = window->getSize();
-	unsigned int padding = 5;
 	unsigned int stepX = windowSize.x/WIDTH;
 	unsigned int stepY = windowSize.y/HEIGHT;
 
-	drawGridLine(stepX, true);
-	drawGridLine(stepY, false);
-
 	for (unsigned int x = 0; x < WIDTH; x++) {
 		for (unsigned int y = 0; y < HEIGHT; y++) {
 			if (!level[y * HEIGHT + x]) continue;
 
-			sf::RectangleShape rectangle(sf::Vector2f(stepY - padding*2, stepY - padding*2));
-			rectangle.setPosition(x * stepX + padding, y * stepY + padding);
+			sf::RectangleShape rectangle(sf::Vector2f(stepY, stepY));
+			rectangle.setPosition(x * stepX, y * stepY);
 
 			window->draw(rectangle);
 		}
 	}
+
+	drawGridLine(stepX, true);
+	drawGridLine(stepY, false);
 }
 
 static void drawGridLine(unsigned int step, bool isHorizontal)
@@ -92,5 +96,7 @@ static sf::Vertex getGridLineVertex(unsigned int offset, unsigned int maxDimensi
 		end   = sf::Vertex(sf::Vector2f(maxDimension, offset));
 	}
 
+	start.color = sf::Color(100, 100, 100);
+	end.color = sf::Color(100, 100, 100);
 	return isStart? start : end;
 }

level.h

@@ -6,5 +6,6 @@
 int level_init(sf::RenderWindow* renderWindow);
 int level_update();
 void level_end();
+float level_rayCastDistance(sf::Vector2f point, float direction);
 
 #endif

makefile

@@ -9,9 +9,9 @@ OBJS := $(SRCS:%.cpp=$(OBJD)/%.o)
 CCFLAGS = -Wall
 LDFLAGS = -lsfml-graphics -lsfml-window -lsfml-system
 
-.PHONY: all run clean
+.PHONY: all run clean tags 
 
-all: $(TARGET)
+all: $(TARGET) tags
 
 $(TARGET): $(OBJS)
 	$(CC) $^ -o $(TARGET) $(LDFLAGS) $(CCFLAGS)
@@ -23,6 +23,8 @@ $(OBJS): $(OBJD)/%.o: %.cpp
 clean:
 	rm -r $(TARGET) $(OBJD)
 
-run: main
+run: $(TARGET) tags
 	./$(TARGET)
 
+tags:
+	ctags -R

view.cpp

@@ -9,8 +9,9 @@ static int handleKeyCode(sf::Keyboard::Key key);
 
 static sf::Uint32 style = sf::Style::Titlebar;
 static sf::RenderWindow window(sf::VideoMode(500, 500), "Raycasting", style);
+static sf::Clock timer;
 
-static Camera camera = { sf::Vector2f(300.f, 250.f), 0.f, 1.f, 70.f };
+static Camera camera = { sf::Vector2f(300.f, 250.f), 0.f, 20, 360.f };
 
 int view_init()
 {
@@ -37,8 +38,10 @@ int view_update()
 	}
 
 	window.clear();
+	
+	sf::Time t = timer.restart();
 	if (!level_update()) return 0;
-	camera_update(&camera, &window);
+	camera_update(&camera, &window, t.asSeconds());
 	window.display();
 
 	return 1;