Created maze program

.vscode/launch.json

@@ -9,7 +9,7 @@
 			"type": "cppdbg",
 			"request": "launch",
 			"program": "${workspaceFolder}/program",
-			"args": [],
+			"args": ["examples/maze3.txt"],
 			"stopAtEntry": false,
 			"cwd": "${fileDirname}",
 			"environment": [],

examples/maze1.txt

@@ -0,0 +1,5 @@
+XXXXXXX
+X     X
+X  X  X
+X     X
+XXXXXXX

examples/maze2.txt

@@ -0,0 +1,9 @@
+XXXXXXXXXXXXXX
+X            X
+XXXXXXXXXXXX X
+X            X
+XXXXX XXXXXXXX
+X            X
+XXXXXXXXXXX  X
+X            X
+XXXXXXXXXXXXXX

examples/maze3.txt

@@ -0,0 +1,7 @@
+XXXXXXX
+X     X
+X  X  X
+X XXX X
+X  X  X
+X     X
+XXXXXXX

src/drawable.h

@@ -1,6 +0,0 @@
-#pragma once
-
-class Drawable {
-public:
-	virtual void draw() = 0;
-};

src/glut_events.h

@@ -0,0 +1,16 @@
+#pragma once
+
+struct GlutEvents {
+	virtual void display() {}
+	virtual void overlayDisplay() {}
+	virtual void reshape(int width, int height) {}
+	virtual void keyboard(unsigned char key, int x, int y) {}
+	virtual void keyboardUp(unsigned char key, int x, int y) {}
+	virtual void mouse(int button, int state, int x, int y) {}
+	virtual void motion(int x, int y) {}
+	virtual void passiveMotion(int x, int y) {}
+	virtual void visibility(int state) {}
+	virtual void entry(int state) {}
+	virtual void special(int key, int x, int y) {}
+	virtual void idle() {}
+};

src/main.cpp

@@ -1,243 +1,158 @@
-#include <iostream>
-#include <functional>
+#include <fstream>
+#include <vector>
+#include <memory>
 #include <string>
-#include <cmath>
 
 #include <GL/gl.h>
 #include <GL/glu.h>
 #include <GL/glut.h>
 
-#include "pixel_wise.h"
-#include "drawable.h"
+#include "glut_events.h"
 #include "utils.hpp"
+#include "no_maze.h"
+#include "maze.h"
 
-GLfloat deltaTime;
+std::vector<std::vector<int>> maze;
+std::unique_ptr<GlutEvents> events;
 
-bool gameRunning = false;
-
-bool mouseDown = false;
-int leftScore = 0;
-int rightScore = 0;
-
-int leftMove = 0;
-int rightMove = 0;
-
-void mouse(int button, int state, int x, int y) {
-	if (state == GLUT_DOWN) {
-		gameRunning = true;
+void display(void) {
+	if (events) {
+		events->display();
 	}
 }
-
-class BoardMiddle : public Drawable {
-public:
-	virtual void draw() {
-		glBegin(GL_POLYGON);
-		glColor3ub(0xBD, 0xBD, 0xBD);
-		glVertex2fv(PW::nm(-2, -1).data());
-		glVertex2fv(PW::nm(2, -1).data());
-		glVertex2fv(PW::nm(2, 1).data());
-		glVertex2fv(PW::nm(-2, 1).data());
-		glEnd();
-	}
-} bm;
-
-class Ball : public Drawable {
-public:
-	static constexpr GLfloat defaultVeloX = 0.5;
-
-	GLfloat radius;
-	GLfloat x, y;
-	GLfloat veloX, veloY;
-
-	Ball(GLfloat x, GLfloat y) : x(x), y(y), radius(0.025), veloX(defaultVeloX) {
-
+void overlayDisplay(void) {
+	if (events) {
+		events->overlayDisplay();
 	}
-
-	virtual void draw() {
-		glBegin(GL_POLYGON);
-		glColor3ub(0xFF, 0xEE, 0x58);
-		for (float i = 0; i < 360; i += 0.5) {
-			const auto rad = Utils::toRad(i);
-			glVertex2f(x + radius * cos(rad), y + radius * sin(rad));
+}
+void reshape(int width, int height) {
+	if (events) {
+		events->reshape(width, height);
 	}
-		glEnd();
+}
+void keyDown(unsigned char key, int x, int y) {
+	if (events) {
+		events->keyboard(key, x, y);
 	}
-
-	void update() {
-		x += veloX * deltaTime;
-		y += veloY * deltaTime;
+}
+void keyUp(unsigned char key, int x, int y) {
+	if (events) {
+		events->keyboardUp(key, x, y);
 	}
-} ball {0, 0};
-
-class Text : public Drawable {
-	std::function<std::string()> strObtainer;
-public:
-	std::function<GLfloat()> x, y;
-	void *font;
-	Text(std::function<std::string()> strObtainer, GLfloat x, GLfloat y) : strObtainer(strObtainer), x([=](){return x;}), y([=](){return y;}), font(GLUT_BITMAP_HELVETICA_18) {}
-	Text(std::function<std::string()> strObtainer, std::function<GLfloat()> x, std::function<GLfloat()> y) : strObtainer(strObtainer), x(x), y(y), font(GLUT_BITMAP_HELVETICA_18) {}
-	Text(std::function<std::string()> strObtainer, std::array<GLfloat, 2> pos) : strObtainer(strObtainer), x([=](){return pos[0];}), y([=](){return pos[1];}), font(GLUT_BITMAP_HELVETICA_18) {}
-	Text(std::function<std::string()> strObtainer, std::function<std::array<GLfloat, 2>()> pos) : strObtainer(strObtainer), x([=](){return pos()[0];}), y([=](){return pos()[1];}), font(GLUT_BITMAP_HELVETICA_18) {}
-
-	virtual void draw() {
-		glRasterPos2f(x(), y());
-		for (const auto& c: strObtainer()) {
-			glutBitmapCharacter(font, c);
+}
+void mouse(int button, int state, int x, int y) {
+	if (events) {
+		events->mouse(button, state, x, y);
 	}
+}
+void motion(int x, int y) {
+	if (events) {
+		events->motion(x, y);
 	}
-} leftScoreText{[](){ return std::to_string(leftScore); }, [](){return PW::tm(-100, 20);}},
- rightScoreText{[](){ return std::to_string(rightScore); }, [](){return PW::tm(100, 20);}};
-
-class Paddle : public Drawable {
-public:
-	GLfloat height, width;
-	GLfloat x, y;
-
-	Paddle(GLfloat x, GLfloat y) : x(x), y(y), height(0.4), width(0.02) {}
-
-	virtual void draw() {
-		glBegin(GL_POLYGON);
-		glVertex2f(x, y);
-		glVertex2f(x + width, y);
-		glVertex2f(x + width, y + height);
-		glVertex2f(x, y + height);
-		glEnd();
-	}
-} leftPaddle{-0.9, -0.2}, rightPaddle{0.9 - 0.02, -0.2};
-
-void display(void) {
-	glClear(GL_COLOR_BUFFER_BIT);
-
-	bm.draw();
-	ball.draw();
-
-	glColor3ub(0x66, 0xBB, 0x6A);
-	leftScoreText.draw();
-	leftPaddle.draw();
-
-	glColor3ub(0x42, 0xA5, 0xF5);
-	rightScoreText.draw();
-	rightPaddle.draw();
-
-	glFlush();
 }
-
-int gameTime;
-
-const GLfloat paddleMoveSpeed = 0.8;
-
-void idle() {
-	int newTime = glutGet(GLUT_ELAPSED_TIME);
-	deltaTime = (newTime - gameTime) / 1000.0;
-	gameTime = newTime;
-
-	if (gameRunning) {
-		ball.update();
-
-		// Detect ball collission
-		if (leftPaddle.x <= (ball.x + ball.radius) && (ball.x - ball.radius) <= (leftPaddle.x + leftPaddle.width)) {
-			// Ball inside left-right area of left paddle
-			if (leftPaddle.y <= ball.y && ball.y <= leftPaddle.y + leftPaddle.height) {
-				// Ball inside up-down area of left paddle
-				ball.veloX = ball.defaultVeloX;
-				ball.veloY = Utils::nummap(ball.y, leftPaddle.y, leftPaddle.y + leftPaddle.height, (GLfloat)-1, (GLfloat)1);
-			}
-		}
-		else if (rightPaddle.x <= (ball.x + ball.radius) && (ball.x - ball.radius) <= (rightPaddle.x + rightPaddle.width)) {
-			// Ball inside left-right area of right paddle
-			if (rightPaddle.y <= ball.y && ball.y <= rightPaddle.y + rightPaddle.height) {
-				// Ball inside up-down area of right paddle
-				ball.veloX = -ball.defaultVeloX;
-				ball.veloY = Utils::nummap(ball.y, rightPaddle.y, rightPaddle.y + rightPaddle.height, (GLfloat)-1, (GLfloat)1);
-			}
-		}
-		else if (ball.x + ball.radius < -1) {
-			// Ball exited board on the left side
-			rightScore += 1;
-			ball.x = ball.y = 0;
-			ball.veloY = 0;
-			gameRunning = false;
-		}
-		else if (ball.x - ball.radius > 1) {
-			// Ball exited board on the right side
-			leftScore += 1;
-			ball.x = ball.y = 0;
-			ball.veloY = 0;
-			gameRunning = false;
-		}
-		else if (ball.y - ball.radius < -1) {
-			// Ball touched bottom side
-			ball.veloY *= -1;
-		}
-		else if (ball.y + ball.radius > 1) {
-			// Ball touched top side
-			ball.veloY *= -1;
+void passiveMotion(int x, int y) {
+	if (events) {
+		events->passiveMotion(x, y);
 	}
+}
+void visibility(int state) {
+	if (events) {
+		events->visibility(state);
+	}
+}
+void entry(int state) {
+	if (events) {
+		events->entry(state);
+	}
+}
+void special(int key, int x, int y) {
+	if (events) {
+		events->special(key, x, y);
+	}
+}
+void idle() {
+	if (events) {
+		events->idle();
 	}
-
-	// Move paddle
-	leftPaddle.y += leftMove * paddleMoveSpeed * deltaTime;
-	rightPaddle.y += rightMove * paddleMoveSpeed * deltaTime;
-
-	// Clamp paddle to stay on screen
-	if (leftPaddle.y < -1) leftPaddle.y = -1;
-	if (rightPaddle.y < -1) rightPaddle.y = -1;
-	if (leftPaddle.y > 1 - leftPaddle.height) leftPaddle.y = 1 - leftPaddle.height;
-	if (rightPaddle.y > 1 - rightPaddle.height) rightPaddle.y = 1 - rightPaddle.height;
-
-	glutPostRedisplay();
 }
 
-void keyDown(unsigned char key, int x, int y) {
-	switch(key) {
-		case 'w':
-		case 'W':
-			leftMove = 1;
-			break;
-		case 's':
-		case 'S':
-			leftMove = -1;
-			break;
-		case 'p':
-		case 'P':
-			rightMove = 1;
-			break;
-		case ';':
-		case ':':
-			rightMove = -1;
+void load_maze(const std::string& path) {
+	std::ifstream f{path};
+	std::string line;
+
+	while(true) {
+		std::getline(f, line);
+		if (!f) {
 			break;
 		}
-}
 
-void keyUp(unsigned char key, int x, int y) {
-	switch(key) {
-		case 'w':
-		case 'W':
-		case 's':
-		case 'S':
-			leftMove = 0;
+		std::vector<int> row;
+		for (const auto& c: line) {
+			switch(c) {
+			case ' ':
+				row.push_back(0);
 				break;
-		case 'p':
-		case 'P':
-		case ';':
-		case ':':
-			rightMove = 0;
+			case 'X':
+				row.push_back(1);
 				break;
+			default:
+				row.push_back(-1);
+			}
+		}
+		if (row.size() > 0) {
+			maze.push_back(row);
+		}
 	}
 }
 
 int main(int argc, char** argv)
 {
+	std::string maze_file;
+	if (argc < 2) {
+		events = std::make_unique<NoMazeScreen>();
+	}
+	else {
+		maze_file = std::string{argv[1]};
+		load_maze(maze_file);
+		events = std::make_unique<MazeScreen>(maze);
+	}
+
 	glutInit(&argc, argv);
-	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
-	glutInitWindowSize(600, 600);
-	glutInitWindowPosition(glutGet(GLUT_SCREEN_WIDTH) * 0.6, (glutGet(GLUT_SCREEN_HEIGHT) - 600) * 0.5);
-	glutCreateWindow("Pong");
+
+	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
+	glClearDepth(1.0f);
+	glDepthFunc(GL_LEQUAL);
+
+
+	glutInitWindowSize(640, 480);
+	glutInitWindowPosition((glutGet(GLUT_SCREEN_WIDTH) - 640) * 0.5, (glutGet(GLUT_SCREEN_HEIGHT) - 480) * 0.5);
+	if (maze_file.size() > 0) {
+		glutCreateWindow((std::string{"Maze - "} + maze_file).c_str());
+	}
+	else {
+		glutCreateWindow("Maze");
+	}
+
+	if (maze_file.size() > 0) {
+		glEnable(GL_DEPTH_TEST);
+		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+		glMatrixMode(GL_PROJECTION);
+		glLoadIdentity();
+		gluPerspective(60, 1, 0.1, 100);
+	}
+
+	glutDisplayFunc(display);
+	glutOverlayDisplayFunc(overlayDisplay);
+	glutReshapeFunc(reshape);
 	glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF);
 	glutKeyboardFunc(keyDown);
 	glutKeyboardUpFunc(keyUp);
-	glutDisplayFunc(display);
 	glutMouseFunc(mouse);
+	glutMotionFunc(motion);
+	glutPassiveMotionFunc(passiveMotion);
+	glutVisibilityFunc(visibility);
+	glutEntryFunc(entry);
+	glutSpecialFunc(special);
 	glutIdleFunc(idle);
 	glutMainLoop();
 	return 0;

src/maze.cpp

@@ -0,0 +1,153 @@
+#include "maze.h"
+
+#include <cmath>
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+
+#include "utils.hpp"
+
+constexpr double PI = 3.14159265358979;
+
+MazeScreen::MazeScreen(const std::vector<std::vector<int>>& maze): 
+	maze(maze), 
+	angleX(0), 
+	mouseCapture(false),
+	posX(1),
+	posZ(1) {}
+
+void MazeScreen::display() {
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+
+	//configures the camera with the position_x and position_z variables
+	gluLookAt(
+		posX, 
+		0, 
+		posZ, 
+		posX + cos((angleX * PI) / 180) * 3, 
+		0, 
+		posZ - sin((angleX * PI) / 180) * 3, 
+		0, 
+		1, 
+		0
+	);
+
+	for (int i = 0; i < maze.size(); i++) {
+		for (int j = 0; j < maze[i].size(); j++) {
+			switch (maze[i][j]) {
+			case -1:
+				glPushMatrix();
+				glColor3f(1, 0, 0);
+				glTranslatef(i, 0, j);
+				glutWireCube(1);
+				glPopMatrix();
+				break;
+			case 1:
+				glPushMatrix();
+				// Scale green by X
+				auto green = Utils::clamp<float>(Utils::nummap<float>(abs(i - posX), 0, 3, 0, 1), 0, 1);
+				// Scale blue by Z
+				auto blue = Utils::clamp<float>(Utils::nummap<float>(abs(j - posZ), 0, 3, 0, 1), 0, 1);
+				glColor3f(1, green, blue);
+				glTranslatef(i, 0, j);
+				if (solid) {
+					glutSolidCube(1);
+				}
+				else {
+					glutWireCube(1);
+				}
+				glPopMatrix();
+				break;
+			}
+		}
+	}
+
+	glFlush();
+	glutSwapBuffers();
+}
+
+void MazeScreen::keyboard(unsigned char key, int x, int y) {
+	if (key == '\e') {
+		mouseCapture = false;
+		glutSetCursor(GLUT_CURSOR_INHERIT);
+	}
+	else if (key == ' ') {
+		solid = !solid;
+	} 
+	else if (key == 'w') {
+		forceX += 1;
+	}
+	else if (key == 's') {
+		forceX -= 1;
+	}
+	else if (key == 'a') {
+		forceZ -= 1;
+	}
+	else if (key == 'd') {
+		forceZ += 1;
+	}
+	glutPostRedisplay();
+}
+
+void MazeScreen::keyboardUp(unsigned char key, int x, int y) {
+	if (key == 'w') {
+		forceX -= 1;
+	}
+	else if (key == 's') {
+		forceX += 1;
+	}
+	else if (key == 'a') {
+		forceZ += 1;
+	}
+	else if (key == 'd') {
+		forceZ -= 1;
+	}
+}
+
+int gameTime;
+
+void MazeScreen::idle() {
+	int newTime = glutGet(GLUT_ELAPSED_TIME);
+	auto deltaTime = (newTime - gameTime) / 1000.0;
+	gameTime = newTime;
+
+	posX += forceX * deltaTime * cos(angleX * PI / 180) + forceZ * deltaTime * sin(angleX * PI / 180);
+	posZ += forceZ * deltaTime * cos(angleX * PI / 180) - forceX * deltaTime * sin(angleX * PI / 180);
+
+	glutPostRedisplay();
+}
+
+void MazeScreen::passiveMotion(int x, int y) {
+	if (mouseCapture) {
+		auto centerX = glutGet(GLUT_WINDOW_WIDTH) / 2;
+		auto centerY = glutGet(GLUT_WINDOW_HEIGHT) / 2;
+
+		auto diffX = x - centerX;
+		auto diffY = x - centerY;
+
+		// only left-right movement
+		angleX -= diffX;
+
+		if (x != centerX || y != centerY) {
+			glutWarpPointer(centerX, centerY);
+		}
+		glutPostRedisplay();
+	}
+}
+
+void MazeScreen::mouse(int button, int state, int x, int y) {
+	if (button == GLUT_LEFT_BUTTON) {
+		auto centerX = glutGet(GLUT_WINDOW_WIDTH) / 2;
+		auto centerY = glutGet(GLUT_WINDOW_HEIGHT) / 2;
+		glutWarpPointer(centerX, centerY);
+		mouseCapture = true;
+		glutSetCursor(GLUT_CURSOR_NONE);
+	} 
+	else if (button == GLUT_RIGHT_BUTTON) {
+		mouseCapture = false;
+		glutSetCursor(GLUT_CURSOR_INHERIT);
+	}
+}

src/maze.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "glut_events.h"
+
+#include <vector>
+
+class MazeScreen : public GlutEvents {
+private:
+	std::vector<std::vector<int>> maze;
+	int angleX;
+	bool mouseCapture;
+	float posX;
+	float posZ;
+	bool solid;
+	float forceX;
+	float forceZ;
+
+public:
+	MazeScreen(const std::vector<std::vector<int>> &maze);
+
+	virtual void display();
+	virtual void keyboard(unsigned char key, int x, int y);
+	virtual void keyboardUp(unsigned char key, int x, int y);
+	virtual void idle();
+	virtual void passiveMotion(int x, int y);
+	virtual void mouse(int button, int state, int x, int y);
+};

src/no_maze.cpp

@@ -0,0 +1,22 @@
+#include "no_maze.h"
+
+#include <string>
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+
+#include "pixel_wise.h"
+
+void NoMazeScreen::display() {
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glColor3ub(0xFF, 0x00, 0x00);
+	glRasterPos2fv(PW::tm(-100, 20).data());
+	for (const auto& c : std::string{"No Maze Loaded"}) {
+		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, c);
+	}
+
+	glFlush();
+	glutSwapBuffers();
+}

src/no_maze.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "glut_events.h"
+
+struct NoMazeScreen : public GlutEvents {
+	virtual void display();
+};

src/utils.hpp

@@ -9,6 +9,19 @@ namespace Utils {
 		return (input - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
 	}
 
+	template <typename T>
+	T clamp(T input, T min, T max) {
+		if (input < min) {
+			return min;
+		}
+		else if (input > max) {
+			return max;
+		}
+		else {
+			return input;
+		}
+	}
+
 	template <typename T>
 	constexpr T toRad(T deg) {
 		return deg * PI / 180;