Let's make 16 games in C++(十四)：Tron

1、准备游戏需要的背景图片

//shader.frag
uniform vec2 frag_LightOrigin;
uniform vec3 frag_LightColor;
uniform float frag_LightAttenuation;
uniform vec2 frag_ScreenResolution;
uniform sampler2D texture;
void main()
{       vec2 baseDistance =  gl_FragCoord.xy; baseDistance.y = frag_ScreenResolution.y-baseDistance.y; float d = length(frag_LightOrigin - baseDistance); float a = 1.0/(frag_LightAttenuation * d);    vec4 color = vec4(a,a,a,1.0) * vec4(frag_LightColor, 1.0);  vec4 t = texture2D(texture, gl_TexCoord[0].xy);if (t[0]>color[0]) color[0]=t[0];if (t[1]>color[1]) color[1]=t[1];if (t[2]>color[2]) color[2]=t[2];gl_FragColor=color;
}

2、绘制一个600x400的屏幕

#include<SFML/Graphics.hpp>
#include<time.h>using namespace sf;const int W = 600;
const int H = 400;
int speed = 4;
bool field[W][H] = { 0 };struct player
{int x;int y;int dir;Color color;player(Color c){x = rand() % W;y = rand() % H;color = c;dir = rand() % 4;}void tick(){if (dir == 0){y += 1;}if (dir == 1){x -= 1;}if (dir == 2){x += 1;}if (dir == 3){y -= 1;}}Vector3f getColor(){return Vector3f(color.r, color.g, color.b);}};int main()
{srand(time(0));RenderWindow window(VideoMode(W, H), "The Tron Game!");window.setFramerateLimit(60);Texture texture;texture.loadFromFile("./Resources/images/background.jpg");Sprite sBackground(texture);player p1(Color::Red);player p2(Color::Green);Sprite sprite;RenderTexture t;t.create(W, H);t.setSmooth(true);sprite.setTexture(t.getTexture());t.clear();t.draw(sBackground);bool Game = 1;while (window.isOpen()){Event e;while (window.pollEvent(e)){if (e.type == Event::Closed){window.close();}}if (Keyboard::isKeyPressed(Keyboard::Left)){if (p1.dir != 2){p1.dir = 1;}}if (Keyboard::isKeyPressed(Keyboard::Right)){if (p1.dir != 1){p1.dir = 2;}}if (Keyboard::isKeyPressed(Keyboard::Up)){if (p1.dir != 0){p1.dir = 3;}}if (Keyboard::isKeyPressed(Keyboard::Down)){if (p1.dir != 3){p1.dir = 0;}}if (Keyboard::isKeyPressed(Keyboard::A)){if (p2.dir != 2){p2.dir = 1;}}if (Keyboard::isKeyPressed(Keyboard::D)){if (p2.dir != 1){p2.dir = 2;}}if (Keyboard::isKeyPressed(Keyboard::W)){if (p2.dir != 0){p2.dir = 3;}}if (Keyboard::isKeyPressed(Keyboard::S)){if (p2.dir != 3){p2.dir = 0;}}if (!Game){continue;}for (int i = 0; i < speed; i++){p1.tick();p2.tick();if (field[p1.x][p1.y] == 1){Game = 0;}if (field[p2.x][p2.y] == 1){Game = 0;}field[p1.x][p1.y] = 1;field[p2.x][p2.y] = 1;CircleShape c(3);c.setPosition(p1.x, p2.y);c.setFillColor(p1.color);t.draw(c);c.setPosition(p2.x, p2.y);c.setFillColor(p2.color);t.draw(c);t.display();}//drawwindow.clear();window.draw(sprite);window.display();}return 0;
}

效果图：

3、添加文字：

#include<SFML/Graphics.hpp>
#include<time.h>using namespace sf;const int W = 600;
const int H = 400;
int speed = 4;
bool field[W][H] = { 0 };struct player
{int x;int y;int dir;Color color;player(Color c){x = rand() % W;y = rand() % H;color = c;dir = rand() % 4;}void tick(){if (dir == 0){y += 1;}if (dir == 1){x -= 1;}if (dir == 2){x += 1;}if (dir == 3){y -= 1;}if (x >= W){x = 0;}if (x < 0){x = W - 1;}if (y >= H){y = 0;}if (y < 0){y = H - 1;}}Vector3f getColor(){return Vector3f(color.r, color.g, color.b);}};int main()
{srand(time(0));RenderWindow window(VideoMode(W, H), "The Tron Game!");window.setFramerateLimit(60);Texture texture;texture.loadFromFile("./Resources/images/background.jpg");Sprite sBackground(texture);player p1(Color::Red);player p2(Color::Green);Sprite sprite;RenderTexture t;t.create(W, H);t.setSmooth(true);sprite.setTexture(t.getTexture());t.clear();t.draw(sBackground);Font font;font.loadFromFile("./Resources/font/arial.ttf");Text text("YOU WIN!", font, 35);text.setPosition(W / 2 - 80, 20);bool Game = 1;while (window.isOpen()){Event e;while (window.pollEvent(e)){if (e.type == Event::Closed){window.close();}}if (Keyboard::isKeyPressed(Keyboard::Left)){if (p1.dir != 2){p1.dir = 1;}}if (Keyboard::isKeyPressed(Keyboard::Right)){if (p1.dir != 1){p1.dir = 2;}}if (Keyboard::isKeyPressed(Keyboard::Up)){if (p1.dir != 0){p1.dir = 3;}}if (Keyboard::isKeyPressed(Keyboard::Down)){if (p1.dir != 3){p1.dir = 0;}}if (Keyboard::isKeyPressed(Keyboard::A)){if (p2.dir != 2){p2.dir = 1;}}if (Keyboard::isKeyPressed(Keyboard::D)){if (p2.dir != 1){p2.dir = 2;}}if (Keyboard::isKeyPressed(Keyboard::W)){if (p2.dir != 0){p2.dir = 3;}}if (Keyboard::isKeyPressed(Keyboard::S)){if (p2.dir != 3){p2.dir = 0;}}if (!Game){window.draw(text);window.display();continue;}for (int i = 0; i < speed; i++){p1.tick();p2.tick();if (field[p1.x][p1.y] == 1){Game = 0;text.setColor(p2.color);}if (field[p2.x][p2.y] == 1){Game = 0;text.setColor(p1.color);}field[p1.x][p1.y] = 1;field[p2.x][p2.y] = 1;CircleShape c(3);c.setPosition(p1.x, p2.y);c.setFillColor(p1.color);t.draw(c);c.setPosition(p2.x, p2.y);c.setFillColor(p2.color);t.draw(c);t.display();}//drawwindow.clear();window.draw(sprite);window.display();}return 0;
}

效果图：

4、添加着色器完善游戏逻辑

#include<SFML/Graphics.hpp>
#include<time.h>using namespace sf;const int W = 600;
const int H = 400;
int speed = 4;
bool field[W][H] = { 0 };struct player
{int x;int y;int dir;Color color;player(Color c){x = rand() % W;y = rand() % H;color = c;dir = rand() % 4;}void tick(){if (dir == 0){y += 1;}if (dir == 1){x -= 1;}if (dir == 2){x += 1;}if (dir == 3){y -= 1;}if (x >= W){x = 0;}if (x < 0){x = W - 1;}if (y >= H){y = 0;}if (y < 0){y = H - 1;}}Vector3f getColor(){return Vector3f(color.r, color.g, color.b);}};int main()
{srand(time(0));RenderWindow window(VideoMode(W, H), "The Tron Game!");window.setFramerateLimit(60);Texture texture;texture.loadFromFile("./Resources/images/background.jpg");Sprite sBackground(texture);player p1(Color::Red);player p2(Color::Green);Sprite sprite;RenderTexture t;t.create(W, H);t.setSmooth(true);sprite.setTexture(t.getTexture());t.clear();t.draw(sBackground);Font font;font.loadFromFile("./Resources/font/arial.ttf");Text text("YOU WIN!", font, 35);text.setPosition(W / 2 - 80, 20);Shader *shader = new Shader;shader->loadFromFile("./Resources/files/shader.frag", Shader::Fragment);shader->setParameter("frag_ScreenResolution", Vector2f(W, H));shader->setParameter("frag_LightAttenuation", 100);RenderStates states;states.shader = shader;bool Game = 1;while (window.isOpen()){Event e;while (window.pollEvent(e)){if (e.type == Event::Closed){window.close();}}if (Keyboard::isKeyPressed(Keyboard::Left)){if (p1.dir != 2){p1.dir = 1;}}if (Keyboard::isKeyPressed(Keyboard::Right)){if (p1.dir != 1){p1.dir = 2;}}if (Keyboard::isKeyPressed(Keyboard::Up)){if (p1.dir != 0){p1.dir = 3;}}if (Keyboard::isKeyPressed(Keyboard::Down)){if (p1.dir != 3){p1.dir = 0;}}if (Keyboard::isKeyPressed(Keyboard::A)){if (p2.dir != 2){p2.dir = 1;}}if (Keyboard::isKeyPressed(Keyboard::D)){if (p2.dir != 1){p2.dir = 2;}}if (Keyboard::isKeyPressed(Keyboard::W)){if (p2.dir != 0){p2.dir = 3;}}if (Keyboard::isKeyPressed(Keyboard::S)){if (p2.dir != 3){p2.dir = 0;}}if (!Game){window.draw(text);window.display();continue;}for (int i = 0; i < speed; i++){p1.tick();p2.tick();if (field[p1.x][p1.y] == 1){Game = 0;text.setColor(p2.color);}if (field[p2.x][p2.y] == 1){Game = 0;text.setColor(p1.color);}field[p1.x][p1.y] = 1;field[p2.x][p2.y] = 1;t.display();shader->setParameter("frag_LightOrigin", Vector2f(p1.x, p1.y));shader->setParameter("frag_LightColor", p1.getColor());t.draw(sprite, states);shader->setParameter("frag_LightOrigin", Vector2f(p2.x, p2.y));shader->setParameter("frag_LightColor", p2.getColor());t.draw(sprite, states);}//drawwindow.clear();window.draw(sprite);window.display();}return 0;
}

结果图：

PS：如果出现关于setColor的错误：Project Properties > Configuration Properties > C/C++ > General > SDL checks选否

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Let's make 16 games in C++(十四)：Tron

1、准备游戏需要的背景图片

2、绘制一个600x400的屏幕

3、添加文字：

4、添加着色器完善游戏逻辑

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