Modified colors, window and ball size and have keypress detection to prevent key spam for toggling on and off features

Cargo.lock

@@ -2,13 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "Test_SDL"
-version = "0.1.0"
-dependencies = [
- "sdl2",
-]
-
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -56,6 +49,13 @@ dependencies = [
  "version-compare",
 ]
 
+[[package]]
+name = "test_sdl"
+version = "0.1.0"
+dependencies = [
+ "sdl2",
+]
+
 [[package]]
 name = "version-compare"
 version = "0.1.0"

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "Test_SDL"
+name = "test_sdl"
 version = "0.1.0"
 edition = "2021"
 

ReadMe.md

@@ -0,0 +1,31 @@
+# test_sdl
+
+It is just a playground for me to test SDL2 features
+
+## Run it
+
+You need to download Rust
+
+Then you clone this repository
+
+And laucnh it with :
+
+```Bash
+cargo build --release
+
+cargo run --release
+```
+
+## Controls
+
+W,A,S,D and Arrow Keys are for moving around the ball.
+
+Left Click teleports the ball to the cursors location.
+
+Right Click cancels any velocity of the ball.
+
+Tab toggles a debug mode where you can see the actual vector applied to the ball wich is render as a cube to see its hitbox (maybe even more in the futur)
+
+Spacebar doubles the acceleration (to use with moderation)
+
+Bonus: Maintain the left click and moving(s) key(s) at the same time and it will store some momentum wich you can use when you release the click. Enjoy :)

src/main.rs

@@ -1,150 +1,284 @@
 use sdl2::pixels::Color;
 use sdl2::event::Event;
 use sdl2::keyboard::Keycode;
+use sdl2::keyboard::Scancode;
 use std::time::Duration;
 use sdl2::rect::Point;
 use sdl2::rect::Rect;
 
-const WINDOW_HEIGHT:i32 = 600;
-const WINDOW_WIDTH:i32 = 800;
-const BLOC_SPEED:f32 = 3.0;
-const MAX_SPEED:f32 = 20.0;
+const WINDOW_HEIGHT:i32 = 800;
+const WINDOW_WIDTH:i32 = 500;
+const BALL_SPEED:f32 = 3.0;
+const MAX_SPEED:f32 = 60.0;
+const DEBUG_FX_SIZE_RATIO:i32 = 2;
+const BOUNCE_RATIO:f32 = 60.0;
+
+const DEFAULT_BALL_WIDTH:i32 = 20;
+const DEFAULT_START_BALL_LOCATION_X:i32 = WINDOW_WIDTH / 2 - DEFAULT_BALL_WIDTH / 2;
+const DEFAULT_START_BALL_LOCATION_Y:i32 = (WINDOW_HEIGHT / 5) * 4 - DEFAULT_BALL_WIDTH / 2;
 
 pub struct Game{
-    main_bloc:Entity,
+    main_ball:Entity,
+    draw_debug:bool,
+    ball_released:bool,
 }   
 impl Game{
     pub fn render(&mut self,ctx:&mut sdl2::render::Canvas<sdl2::video::Window>){
-        ctx.set_draw_color(Color::RGB(0x6D, 0x6D, 0x64));
+        let main_ball_color:Color = Color::RGB(0xFA, 0xFD, 0xF6);
+        let main_ball_outline:Color = Color::RGB(0x17, 0x2A, 0x33);
+        let background_color:Color = Color::RGB(0x6A,0x9A,0x1D);
+        ctx.set_draw_color(background_color);
         ctx.clear();
-
-        //Rendering main_bloc
-        ctx.set_draw_color(Color::RGB(0x33, 0x33, 0x33));
-        ctx.fill_rect(self.main_bloc.shape).expect("Could not fill the rectangle");
-        //ctx.set_draw_color(Color::RGB(0xFF, 0xFF, 0xFF));
-        //ctx.draw_rect(self.main_bloc.shape).expect("Could not outline the rectangle");
+        let center:Point = Point::new(self.main_ball.shape.x + (self.main_ball.shape.width() / 2) as i32,self.main_ball.shape.y + (self.main_ball.shape.width() / 2) as i32);
+        if self.draw_debug {
+            ctx.set_draw_color(main_ball_color);
+            ctx.fill_rect(self.main_ball.shape).expect("Could not fill the rectangle");
+            ctx.set_draw_color(main_ball_outline);
+            ctx.draw_rect(self.main_ball.shape).expect("Could not ouline the rectangle");
+            let apex:Point = Point::new(center.x + (self.main_ball.velocity.x * DEBUG_FX_SIZE_RATIO) as i32,center.y + (self.main_ball.velocity.y * DEBUG_FX_SIZE_RATIO) as i32);
+            ctx.draw_line(center,apex).expect("Could not render the Debug FX");
+        }else{
+            fill_circle(ctx, center.x, center.y,self.main_ball.shape.width() as i32 / 2, main_ball_color);
+            draw_circle(ctx,center.x,center.y,self.main_ball.shape.width() as i32 / 2, main_ball_outline);
+            draw_circle(ctx,center.x,center.y,self.main_ball.shape.width() as i32 / 2 + 1, main_ball_outline);
+        }
     }
     pub fn up(&mut self){
-        // 'w' or the up arrow has been pressed
-        //println!("DEBUG: Up is pressed");
-        self.main_bloc.velocity.y -= BLOC_SPEED as i32;
-        if self.main_bloc.velocity.y < -MAX_SPEED as i32{
-            self.main_bloc.velocity.y = -MAX_SPEED as i32;
+        self.main_ball.velocity.y -= BALL_SPEED as i32;
+        if self.main_ball.velocity.y < -MAX_SPEED as i32{
+            self.main_ball.velocity.y = -MAX_SPEED as i32;
         }
     }
     pub fn down(&mut self){
-        // 's' or the down arrow has been pressed
-        //println!("DEBUG: Down is pressed");
-        self.main_bloc.velocity.y += BLOC_SPEED as i32;
-        if self.main_bloc.velocity.y > MAX_SPEED as i32{
-            self.main_bloc.velocity.y = MAX_SPEED as i32;
+        self.main_ball.velocity.y += BALL_SPEED as i32;
+        if self.main_ball.velocity.y > MAX_SPEED as i32{
+            self.main_ball.velocity.y = MAX_SPEED as i32;
         }
     }
     pub fn left(&mut self){
-        // 'a' or the left arrow has been pressed
-        //println!("DEBUG: Left is pressed");
-        self.main_bloc.velocity.x -= BLOC_SPEED as i32;
-        if self.main_bloc.velocity.x < -MAX_SPEED as i32{
-            self.main_bloc.velocity.x = -MAX_SPEED as i32;
+        self.main_ball.velocity.x -= BALL_SPEED as i32;
+        if self.main_ball.velocity.x < -MAX_SPEED as i32{
+            self.main_ball.velocity.x = -MAX_SPEED as i32;
         }
     }
     pub fn right(&mut self){
-        // 'd' or the right arrow has been pressed
-        //println!("DEBUG: Right is pressed");
-        self.main_bloc.velocity.x += BLOC_SPEED as i32;
-        if self.main_bloc.velocity.y > MAX_SPEED as i32{
-            self.main_bloc.velocity.y = MAX_SPEED as i32;
+        self.main_ball.velocity.x += BALL_SPEED as i32;
+        if self.main_ball.velocity.y > MAX_SPEED as i32{
+            self.main_ball.velocity.y = MAX_SPEED as i32;
         }
     }
+    pub fn toggle_debug(&mut self){
+        self.draw_debug = !self.draw_debug;
+    }
+    pub fn release(&mut self){
+        if self.ball_released{
+            self.main_ball.shape.set_x(DEFAULT_START_BALL_LOCATION_X);
+            self.main_ball.shape.set_y(DEFAULT_START_BALL_LOCATION_Y);
+        }
+        self.ball_released = !self.ball_released;
+    }
+    pub fn left_click(&mut self,mouse_position:Point){
+        // moves the bloc at the cursor position
+        self.main_ball.shape.set_x(mouse_position.x - (self.main_ball.shape.width() / 2) as i32);
+        self.main_ball.shape.set_y(mouse_position.y - (self.main_ball.shape.height() / 2) as i32);
+    }
+    pub fn right_click(&mut self,_mouse_position:Point){
+        // Removes any vectors
+        self.main_ball.velocity = Point::new(0,0);
+    }
     pub fn update(&mut self){
-        let mut posx = self.main_bloc.shape.x;
-        let mut posy = self.main_bloc.shape.y;
-        posx += self.main_bloc.velocity.x;
-        posy += self.main_bloc.velocity.y;
-        let bloc_width:i32 = self.main_bloc.shape.width() as i32;
-        let bloc_height:i32 = self.main_bloc.shape.height() as i32;
+        let bloc = &mut self.main_ball;
+        let mut posx = bloc.shape.x;
+        let mut posy = bloc.shape.y;
+        let width = bloc.shape.width() as i32;
+        let height = bloc.shape.height() as i32;
 
-        if posx + bloc_width > WINDOW_WIDTH{
-            posx = WINDOW_WIDTH - bloc_width as i32;
-            self.main_bloc.velocity.x = 0;
-        }else{
-            if posx < 0{
-                posx = 0;
-                self.main_bloc.velocity.x = 0;
-            }
+        if posy + height >= WINDOW_HEIGHT{
+            //we hit rock bottom
+            posy = WINDOW_HEIGHT - height;
+            bloc.velocity.y = -(bloc.velocity.y as f32 / 100.0 * BOUNCE_RATIO) as i32;
         }
-        if posy + bloc_height > WINDOW_HEIGHT{
-            posy = WINDOW_HEIGHT - bloc_height as i32;
-            self.main_bloc.velocity.y = 0;
-        }else{
-            if posy < 0{
-                posy = 0;
-                self.main_bloc.velocity.y = 0;
-            }
+        if posy <= 0{
+            //we hit top
+            posy = 0;
+            bloc.velocity.y = -(bloc.velocity.y as f32 / 100.0 * BOUNCE_RATIO) as i32;
+        }
+        if posx + width >= WINDOW_WIDTH{
+            //we hit right
+            posx = WINDOW_WIDTH - width;
+            bloc.velocity.x = -(bloc.velocity.x as f32 / 100.0 * BOUNCE_RATIO) as i32;
+        }
+        if posx <= 0{
+            //we hit left
+            posx = 0;
+            bloc.velocity.x = -(bloc.velocity.x as f32 / 100.0 * BOUNCE_RATIO) as i32;
         }
 
-        if self.main_bloc.velocity.x > 0{
-            if self.main_bloc.velocity.x < BLOC_SPEED as i32{
-                self.main_bloc.velocity.x = 0;
-            }else{
-                self.main_bloc.velocity.x -= (BLOC_SPEED / 2.0) as i32;
-            }
-        }else{
-            if self.main_bloc.velocity.x > -BLOC_SPEED as i32{
-                self.main_bloc.velocity.x = 0;
-            }else{
-                self.main_bloc.velocity.x += (BLOC_SPEED / 2.0) as i32;
-            }
+        if bloc.velocity.x > MAX_SPEED as i32{
+            bloc.velocity.x = MAX_SPEED as i32;
+        }
+        if bloc.velocity.x < -MAX_SPEED as i32{
+            bloc.velocity.x = -MAX_SPEED as i32;
+        }
+        if bloc.velocity.y > MAX_SPEED as i32{
+            bloc.velocity.y = MAX_SPEED as i32;
+        }
+        if bloc.velocity.y < -MAX_SPEED as i32{
+            bloc.velocity.y = -MAX_SPEED as i32;
         }
 
-        if self.main_bloc.velocity.y > 0{
-            if self.main_bloc.velocity.y < BLOC_SPEED as i32{
-                self.main_bloc.velocity.y = 0;
-            }else{
-                self.main_bloc.velocity.y -= (BLOC_SPEED / 2.0) as i32;
-            }
-        }else{
-            if self.main_bloc.velocity.y > -BLOC_SPEED as i32{
-                self.main_bloc.velocity.y = 0;
-            }else{
-                self.main_bloc.velocity.y += (BLOC_SPEED / 2.0) as i32;
-            }
+        if self.ball_released {
+            posx += bloc.velocity.x;
+            posy += bloc.velocity.y;
         }
+        bloc.shape.set_x(posx);
+        bloc.shape.set_y(posy);
         
-        self.main_bloc.shape.set_x(posx);
-        self.main_bloc.shape.set_y(posy);
     }
 }
+//https://stackoverflow.com/questions/65723827/sdl2-function-to-draw-a-filled-circle ## Translated to Rust
+pub fn fill_circle(ctx:&mut sdl2::render::Canvas<sdl2::video::Window>, x:i32, y:i32, radius:i32, color:Color)
+{
+    ctx.set_draw_color(color);
+    let diameter = radius * 2;
+    for w in 0..diameter{
+        for h in 0..diameter{
+            let dx = radius - w; // horizontal offset
+            let dy = radius - h; // vertical offset
+            if (dx*dx + dy*dy) <= (radius * radius)
+            {
+                ctx.draw_point(Point::new(x + dx, y + dy)).expect("Trouble rendering the circle");
+            }
+        }
+    }
+}
+// https://stackoverflow.com/questions/38334081/howto-draw-circles-arcs-and-vector-graphics-in-sdl ## Translated to Rust
+pub fn draw_circle(ctx:&mut sdl2::render::Canvas<sdl2::video::Window>, centre_x:i32, centre_y:i32, radius:i32, color:Color)
+{
+    ctx.set_draw_color(color);
+    let diameter = radius * 2;
+    let mut x:i32 = radius - 1;
+    let mut y:i32 = 0;
+    let mut tx:i32 = 1;
+    let mut ty:i32 = 1;
+    let mut error:i32 = tx - diameter;
 
+    while x >= y
+    {
+        //  Each of the following renders an octant of the circle
+        ctx.draw_point(Point::new(centre_x + x, centre_y - y)).expect("Trouble rendering the circle");
+        ctx.draw_point(Point::new(centre_x + x, centre_y + y)).expect("Trouble rendering the circle");
+        ctx.draw_point(Point::new(centre_x - x, centre_y - y)).expect("Trouble rendering the circle");
+        ctx.draw_point(Point::new(centre_x - x, centre_y + y)).expect("Trouble rendering the circle");
+        ctx.draw_point(Point::new(centre_x + y, centre_y - x)).expect("Trouble rendering the circle");
+        ctx.draw_point(Point::new(centre_x + y, centre_y + x)).expect("Trouble rendering the circle");
+        ctx.draw_point(Point::new(centre_x - y, centre_y - x)).expect("Trouble rendering the circle");
+        ctx.draw_point(Point::new(centre_x - y, centre_y + x)).expect("Trouble rendering the circle");
+
+        if error <= 0{
+            y+= 1;
+            error += ty;
+            ty += 2;
+        }
+        if error > 0{
+            x -= 1;
+            tx += 2;
+            error += tx - diameter;
+        }
+    }
+}
 pub struct Entity{
     shape:Rect,
     velocity:Point,
 }
-
+fn is_up_pressed(e: &sdl2::EventPump) -> bool {
+    e.keyboard_state().is_scancode_pressed(Scancode::W) || e.keyboard_state().is_scancode_pressed(Scancode::Up)
+}
+fn is_down_pressed(e: &sdl2::EventPump)-> bool{
+    e.keyboard_state().is_scancode_pressed(Scancode::S) || e.keyboard_state().is_scancode_pressed(Scancode::Down)
+}
+fn is_left_pressed(e: &sdl2::EventPump)-> bool{
+    e.keyboard_state().is_scancode_pressed(Scancode::A) || e.keyboard_state().is_scancode_pressed(Scancode::Left)
+}
+fn is_right_pressed(e: &sdl2::EventPump)-> bool{
+    e.keyboard_state().is_scancode_pressed(Scancode::D) || e.keyboard_state().is_scancode_pressed(Scancode::Right)
+}
+fn is_tab_pressed(e: &sdl2::EventPump)-> bool{
+    e.keyboard_state().is_scancode_pressed(Scancode::Tab)
+}
+fn is_space_pressed(e: &sdl2::EventPump)-> bool{
+    e.keyboard_state().is_scancode_pressed(Scancode::Space)
+}
+fn check_mouse_left_pressed(e: &sdl2::EventPump) -> Point{
+    if e.mouse_state().left(){
+        return Point::new(e.mouse_state().x(),e.mouse_state().y());
+    }else{
+        return Point::new(-1,-1);
+    }
+}
+fn check_mouse_right_pressed(e: &sdl2::EventPump) -> Point{
+    if e.mouse_state().right(){
+        return Point::new(e.mouse_state().x(),e.mouse_state().y());
+    }else{
+        return Point::new(-1,-1);
+    }
+}
 pub fn main_loop(canvas: &mut sdl2::render::Canvas<sdl2::video::Window>,event_pump:&mut sdl2::EventPump,game:&mut Game){
-    'running: loop {
-        canvas.clear();
+    //let (mut up_state,mut down_state,mut left_state,mut right_state) = (false,false,false,false);
+    let (mut tab_state,mut space_state) = (false,false);
+    let mut quit = false;
+    loop{
+        if is_up_pressed(event_pump){
+            game.up();
+        }
+        if is_down_pressed(event_pump){
+            game.down();
+        }
+        if is_left_pressed(event_pump){
+            game.left();
+        }
+        if is_right_pressed(event_pump){
+            game.right();
+        }
+        if is_tab_pressed(event_pump){
+            if tab_state == false{
+                //Keydown
+                tab_state = true;
+                game.toggle_debug();
+            }
+        }else{
+            if tab_state == true{
+                //keyUp
+                tab_state = false
+            }
+        }
+        if is_space_pressed(event_pump){
+            if space_state == false{
+                //KeyDown
+                space_state = true;
+                game.release();
+            }
+        }else{
+            if space_state == true{
+                //KeyDown
+                space_state = false;
+            }
+        }
+        let mut mouse_position:Point = check_mouse_left_pressed(event_pump);
+        if mouse_position.x >=0 && mouse_position.y >= 0{
+            game.left_click(mouse_position);
+        }
+        mouse_position = check_mouse_right_pressed(event_pump);
+        if mouse_position.x >=0 && mouse_position.y >= 0{
+            game.right_click(mouse_position);
+        }
+
         for event in event_pump.poll_iter() {
             match event {
                 Event::Quit {..} |
                 Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
-                    break 'running
-                },
-                Event::KeyDown { keycode: Some(Keycode::W), .. } | Event::KeyDown {keycode: Some(Keycode::Up), ..} => {
-                    //pressed up
-                    game.up();
-                },
-                Event::KeyDown { keycode: Some(Keycode::S), .. } | Event::KeyDown { keycode: Some(Keycode::Down), .. } => {
-                    //pressed up
-                    game.down();
-                },
-                Event::KeyDown { keycode: Some(Keycode::A), .. } | Event::KeyDown { keycode: Some(Keycode::Left), .. } => {
-                    //pressed up
-                    game.left();
-                },
-                Event::KeyDown { keycode: Some(Keycode::D), .. } | Event::KeyDown { keycode: Some(Keycode::Right), .. } => {
-                    //pressed up
-                    game.right();
+                    quit = true;
+                    break 
                 },
                 _ => {}
             }
@@ -157,6 +291,10 @@ pub fn main_loop(canvas: &mut sdl2::render::Canvas<sdl2::video::Window>,event_pu
 
         canvas.present();
         ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
+
+        if quit{
+            break;
+        }
     }
 }
 
@@ -164,7 +302,7 @@ pub fn main() {
     let sdl_context = sdl2::init().unwrap();
     let video_subsystem = sdl_context.video().unwrap();
 
-    let window = video_subsystem.window("Test SDL Rust", WINDOW_WIDTH as u32, WINDOW_HEIGHT as u32)
+    let window = video_subsystem.window("Rusty Golfy", WINDOW_WIDTH as u32, WINDOW_HEIGHT as u32)
         .position_centered()
         .build()
         .unwrap();
@@ -174,15 +312,13 @@ pub fn main() {
 
     canvas.set_draw_color(Color::RGB(0x6D, 0x6D, 0x64));
 
-    let main_bloc_width:i32 = 50;
-    let main_bloc_height:i32 = 50;
-    let main_bloc_position:Point = Point::new(WINDOW_WIDTH / 2 - main_bloc_width / 2,WINDOW_HEIGHT / 2 - main_bloc_height / 2);
-    let main_bloc_rectangle = Rect::new(main_bloc_position.x,main_bloc_position.y, main_bloc_width as u32, main_bloc_height as u32);
-    let main_bloc_velocity = Point::new(0,0);
+    let main_ball_rectangle = Rect::new(
+        DEFAULT_START_BALL_LOCATION_X,DEFAULT_START_BALL_LOCATION_Y, DEFAULT_BALL_WIDTH as u32, DEFAULT_BALL_WIDTH as u32);
+    let main_ball_velocity = Point::new(0,0);
     let main_entity = Entity{
-        shape:main_bloc_rectangle,
-        velocity:main_bloc_velocity
+        shape:main_ball_rectangle,
+        velocity:main_ball_velocity
     };
-    let mut game = Game{main_bloc:main_entity};
+    let mut game = Game{main_ball:main_entity,draw_debug:false,ball_released:false};
     main_loop(&mut canvas,&mut event_pump,&mut game);
 }