Merge pull request #159 from Kethku/framerate-independent-cursor

Framerate independent cursor

.github/workflows/rust.yml

@@ -55,7 +55,7 @@ jobs:
       run:  |
         curl -sL "http://packages.lunarg.com/lunarg-signing-key-pub.asc" | sudo apt-key add -
         sudo curl -sLo "/etc/apt/sources.list.d/lunarg-vulkan-1.2.131-bionic.list" "http://packages.lunarg.com/vulkan/1.2.131/lunarg-vulkan-1.2.131-bionic.list"
-        sudo apt-get update -y
+        sudo apt-get update -y --ignore-missing
         sudo apt-get install -y vulkan-sdk
 
     - name: Install dependencies

src/main.rs

@@ -25,6 +25,7 @@ pub const INITIAL_DIMENSIONS: (u64, u64) = (100, 50);
 fn main() {
     window::initialize_settings();
     redraw_scheduler::initialize_settings();
+    renderer::cursor_renderer::initialize_settings();
 
     initialize(&BRIDGE);
     ui_loop();

src/renderer/cursor_renderer/animation_utils.rs

@@ -0,0 +1,81 @@
+use skulpin::skia_safe::Point;
+
+#[allow(dead_code)]
+pub fn ease_linear(t: f32) -> f32 {
+    t
+}
+
+#[allow(dead_code)]
+pub fn ease_in_quad(t: f32) -> f32 {
+    t * t
+}
+
+#[allow(dead_code)]
+pub fn ease_out_quad(t: f32) -> f32 {
+    -t * (t - 2.0)
+}
+
+#[allow(dead_code)]
+pub fn ease_in_out_quad(t: f32) -> f32 {
+    if t < 0.5 {
+        2.0 * t * t
+    } else {
+        let n = t * 2.0 - 1.0;
+        -0.5 * (n * (n - 2.0) - 1.0)
+    }
+}
+
+#[allow(dead_code)]
+pub fn ease_in_cubic(t: f32) -> f32 {
+    t * t * t
+}
+
+#[allow(dead_code)]
+pub fn ease_out_cubic(t: f32) -> f32 {
+    let n = t - 1.0;
+    n * n * n + 1.0
+}
+
+#[allow(dead_code)]
+pub fn ease_in_out_cubic(t: f32) -> f32 {
+    let n = 2.0 * t;
+    if n < 1.0 {
+        0.5 * n * n * n
+    } else {
+        let n = n - 2.0;
+        0.5 * (n * n * n + 2.0)
+    }
+}
+
+#[allow(dead_code)]
+pub fn ease_in_expo(t: f32) -> f32 {
+    if t == 0.0 {
+        0.0
+    } else {
+        2.0f32.powf(10.0 * (t - 1.0))
+    }
+}
+
+#[allow(dead_code)]
+pub fn ease_out_expo(t: f32) -> f32 {
+    if t == 1.0 {
+        1.0
+    } else {
+        1.0 - 2.0f32.powf(-10.0 * t)
+    }
+}
+
+pub fn lerp(start: f32, end: f32, t: f32) -> f32 {
+    start + (end - start) * t
+}
+
+pub fn ease(ease_func: fn(f32) -> f32, start: f32, end: f32, t: f32) -> f32 {
+    lerp(start, end, ease_func(t))
+}
+
+pub fn ease_point(ease_func: fn(f32) -> f32, start: Point, end: Point, t: f32) -> Point {
+    Point {
+        x: ease(ease_func, start.x, end.x, t),
+        y: ease(ease_func, start.y, end.y, t),
+    }
+}

src/renderer/cursor_renderer/cursor_vfx.rs

@@ -0,0 +1,401 @@
+use log::error;
+use skulpin::skia_safe::{paint::Style, BlendMode, Canvas, Color, Paint, Point, Rect};
+
+use super::animation_utils::*;
+use super::CursorSettings;
+use crate::editor::{Colors, Cursor};
+use crate::settings::*;
+
+pub trait CursorVfx {
+    fn update(
+        &mut self,
+        settings: &CursorSettings,
+        current_cursor_destination: Point,
+        font_size: (f32, f32),
+        dt: f32,
+    ) -> bool;
+    fn restart(&mut self, position: Point);
+    fn render(
+        &self,
+        settings: &CursorSettings,
+        canvas: &mut Canvas,
+        cursor: &Cursor,
+        colors: &Colors,
+        font_size: (f32, f32),
+    );
+}
+
+#[derive(Clone, PartialEq)]
+pub enum HighlightMode {
+    SonicBoom,
+    Ripple,
+    Wireframe,
+}
+
+#[derive(Clone, PartialEq)]
+pub enum TrailMode {
+    Railgun,
+    Torpedo,
+    PixieDust,
+}
+
+#[derive(Clone, PartialEq)]
+pub enum VfxMode {
+    Highlight(HighlightMode),
+    Trail(TrailMode),
+    Disabled,
+}
+
+impl FromValue for VfxMode {
+    fn from_value(&mut self, value: Value) {
+        if value.is_str() {
+            *self = match value.as_str().unwrap() {
+                "sonicboom" => VfxMode::Highlight(HighlightMode::SonicBoom),
+                "ripple" => VfxMode::Highlight(HighlightMode::Ripple),
+                "wireframe" => VfxMode::Highlight(HighlightMode::Wireframe),
+                "railgun" => VfxMode::Trail(TrailMode::Railgun),
+                "torpedo" => VfxMode::Trail(TrailMode::Torpedo),
+                "pixiedust" => VfxMode::Trail(TrailMode::PixieDust),
+                "" => VfxMode::Disabled,
+                value => {
+                    error!("Expected a VfxMode name, but received {:?}", value);
+                    return;
+                }
+            };
+        } else {
+            error!("Expected a VfxMode string, but received {:?}", value);
+        }
+    }
+}
+
+impl From<VfxMode> for Value {
+    fn from(mode: VfxMode) -> Self {
+        match mode {
+            VfxMode::Highlight(HighlightMode::SonicBoom) => Value::from("sonicboom"),
+            VfxMode::Highlight(HighlightMode::Ripple) => Value::from("ripple"),
+            VfxMode::Highlight(HighlightMode::Wireframe) => Value::from("wireframe"),
+            VfxMode::Trail(TrailMode::Railgun) => Value::from("railgun"),
+            VfxMode::Trail(TrailMode::Torpedo) => Value::from("torpedo"),
+            VfxMode::Trail(TrailMode::PixieDust) => Value::from("pixiedust"),
+            VfxMode::Disabled => Value::from(""),
+        }
+    }
+}
+
+pub fn new_cursor_vfx(mode: &VfxMode) -> Option<Box<dyn CursorVfx>> {
+    match mode {
+        VfxMode::Highlight(mode) => Some(Box::new(PointHighlight::new(mode))),
+        VfxMode::Trail(mode) => Some(Box::new(ParticleTrail::new(mode))),
+        VfxMode::Disabled => None,
+    }
+}
+
+pub struct PointHighlight {
+    t: f32,
+    center_position: Point,
+    mode: HighlightMode,
+}
+
+impl PointHighlight {
+    pub fn new(mode: &HighlightMode) -> PointHighlight {
+        PointHighlight {
+            t: 0.0,
+            center_position: Point::new(0.0, 0.0),
+            mode: mode.clone(),
+        }
+    }
+}
+
+impl CursorVfx for PointHighlight {
+    fn update(
+        &mut self,
+        _settings: &CursorSettings,
+        _current_cursor_destination: Point,
+        _font_size: (f32, f32),
+        dt: f32,
+    ) -> bool {
+        self.t = (self.t + dt * 5.0).min(1.0); // TODO - speed config
+        self.t < 1.0
+    }
+
+    fn restart(&mut self, position: Point) {
+        self.t = 0.0;
+        self.center_position = position;
+    }
+
+    fn render(
+        &self,
+        settings: &CursorSettings,
+        canvas: &mut Canvas,
+        cursor: &Cursor,
+        colors: &Colors,
+        font_size: (f32, f32),
+    ) {
+        if self.t == 1.0 {
+            return;
+        }
+        let mut paint = Paint::new(skulpin::skia_safe::colors::WHITE, None);
+        paint.set_blend_mode(BlendMode::SrcOver);
+
+        let base_color: Color = cursor.background(&colors).to_color();
+        let alpha = ease(ease_in_quad, settings.vfx_opacity, 0.0, self.t) as u8;
+        let color = Color::from_argb(alpha, base_color.r(), base_color.g(), base_color.b());
+        paint.set_color(color);
+
+        let size = 3.0 * font_size.1;
+        let radius = self.t * size;
+        let hr = radius * 0.5;
+        let rect = Rect::from_xywh(
+            self.center_position.x - hr,
+            self.center_position.y - hr,
+            radius,
+            radius,
+        );
+
+        match self.mode {
+            HighlightMode::SonicBoom => {
+                canvas.draw_oval(&rect, &paint);
+            }
+            HighlightMode::Ripple => {
+                paint.set_style(Style::Stroke);
+                paint.set_stroke_width(font_size.1 * 0.2);
+                canvas.draw_oval(&rect, &paint);
+            }
+            HighlightMode::Wireframe => {
+                paint.set_style(Style::Stroke);
+                paint.set_stroke_width(font_size.1 * 0.2);
+                canvas.draw_rect(&rect, &paint);
+            }
+        }
+    }
+}
+
+#[derive(Clone)]
+struct ParticleData {
+    pos: Point,
+    speed: Point,
+    lifetime: f32,
+}
+
+pub struct ParticleTrail {
+    particles: Vec<ParticleData>,
+    previous_cursor_dest: Point,
+    trail_mode: TrailMode,
+    rng: RngState,
+}
+
+impl ParticleTrail {
+    pub fn new(trail_mode: &TrailMode) -> ParticleTrail {
+        ParticleTrail {
+            particles: vec![],
+            previous_cursor_dest: Point::new(0.0, 0.0),
+            trail_mode: trail_mode.clone(),
+            rng: RngState::new(),
+        }
+    }
+
+    fn add_particle(&mut self, pos: Point, speed: Point, lifetime: f32) {
+        self.particles.push(ParticleData {
+            pos,
+            speed,
+            lifetime,
+        });
+    }
+
+    // Note this method doesn't keep particles in order
+    fn remove_particle(&mut self, idx: usize) {
+        self.particles[idx] = self.particles[self.particles.len() - 1].clone();
+        self.particles.pop();
+    }
+}
+
+impl CursorVfx for ParticleTrail {
+    fn update(
+        &mut self,
+        settings: &CursorSettings,
+        current_cursor_dest: Point,
+        font_size: (f32, f32),
+        dt: f32) -> bool {
+        // Update lifetimes and remove dead particles
+        let mut i = 0;
+        while i < self.particles.len() {
+            let particle: &mut ParticleData = &mut self.particles[i];
+            particle.lifetime -= dt;
+            if particle.lifetime <= 0.0 {
+                self.remove_particle(i);
+            } else {
+                i += 1;
+            }
+        }
+
+        // Update particle positions
+        for i in 0..self.particles.len() {
+            let particle = &mut self.particles[i];
+            particle.pos += particle.speed * dt;
+        }
+
+        // Spawn new particles
+        if current_cursor_dest != self.previous_cursor_dest {
+            let travel = current_cursor_dest - self.previous_cursor_dest;
+            let travel_distance = travel.length();
+            // Increase amount of particles when cursor travels further
+            let particle_count =
+                ((travel_distance / font_size.0).powf(1.5) * settings.vfx_particle_density * 0.01) as usize;
+
+            let prev_p = self.previous_cursor_dest;
+
+            for i in 0..particle_count {
+                let t = i as f32 / (particle_count as f32);
+
+                let speed = match self.trail_mode {
+                    TrailMode::Railgun => {
+                        let phase = t * 60.0; // TODO -- Hardcoded spiral curl
+                        Point::new(phase.sin(), phase.cos()) * 20.0 // TODO -- Hardcoded spiral outward speed
+                    }
+                    TrailMode::Torpedo => {
+                        self.rng.rand_dir_normalized() * 10.0 // TODO -- Hardcoded particle speed
+                    }
+                    TrailMode::PixieDust => {
+                        let base_dir = self.rng.rand_dir_normalized();
+                        let dir = Point::new(base_dir.x * 0.5, 0.4 + base_dir.y.abs());
+                        dir * 30.0 // TODO -- hardcoded particle speed
+                    }
+                };
+
+                // Distribute particles along the travel distance, with a random offset to make it
+                // look random
+
+                let pos = match self.trail_mode {
+                    TrailMode::Railgun => prev_p + travel * t,
+                    TrailMode::PixieDust | TrailMode::Torpedo => {
+                        prev_p + travel * self.rng.next_f32() + Point::new(0.0, font_size.1 * 0.5)
+                    }
+                };
+
+                self.add_particle(pos, speed, t * settings.vfx_particle_lifetime);
+            }
+
+            self.previous_cursor_dest = current_cursor_dest;
+        }
+
+        // Keep animating as long as there are particles alive
+        !self.particles.is_empty()
+    }
+
+    fn restart(&mut self, _position: Point) {}
+
+    fn render(
+        &self,
+        settings: &CursorSettings,
+        canvas: &mut Canvas,
+        cursor: &Cursor,
+        colors: &Colors,
+        font_size: (f32, f32),
+    ) {
+        let mut paint = Paint::new(skulpin::skia_safe::colors::WHITE, None);
+        match self.trail_mode {
+            TrailMode::Torpedo | TrailMode::Railgun => {
+                paint.set_style(Style::Stroke);
+                paint.set_stroke_width(font_size.1 * 0.2);
+            }
+            _ => {}
+        }
+
+        let base_color: Color = cursor.background(&colors).to_color();
+
+        paint.set_blend_mode(BlendMode::SrcOver);
+
+        self.particles.iter().for_each(|particle| {
+            let l = particle.lifetime / settings.vfx_particle_lifetime;
+            let alpha = (l * settings.vfx_opacity) as u8;
+            let color = Color::from_argb(alpha, base_color.r(), base_color.g(), base_color.b());
+            paint.set_color(color);
+
+            let radius = match self.trail_mode {
+                TrailMode::Torpedo | TrailMode::Railgun => font_size.0 * 0.5 * l,
+                TrailMode::PixieDust => font_size.0 * 0.2,
+            };
+
+            let hr = radius * 0.5;
+            let rect = Rect::from_xywh(particle.pos.x - hr, particle.pos.y - hr, radius, radius);
+
+            match self.trail_mode {
+                TrailMode::Torpedo | TrailMode::Railgun => {
+                    canvas.draw_oval(&rect, &paint);
+                }
+                TrailMode::PixieDust => {
+                    canvas.draw_rect(&rect, &paint);
+                }
+            }
+        });
+    }
+}
+
+// Random number generator based on http://www.pcg-random.org/
+struct RngState {
+    state: u64,
+    inc: u64,
+}
+
+impl RngState {
+    fn new() -> RngState {
+        RngState {
+            state: 0x853C49E6748FEA9Bu64,
+            inc: (0xDA3E39CB94B95BDBu64 << 1) | 1,
+        }
+    }
+    fn next(&mut self) -> u32 {
+        let old_state = self.state;
+
+        // Implementation copied from:
+        // https://rust-random.github.io/rand/src/rand_pcg/pcg64.rs.html#103
+        let new_state = old_state
+            .wrapping_mul(6_364_136_223_846_793_005u64)
+            .wrapping_add(self.inc);
+
+        self.state = new_state;
+
+        const ROTATE: u32 = 59; // 64 - 5
+        const XSHIFT: u32 = 18; // (5 + 32) / 2
+        const SPARE: u32 = 27; // 64 - 32 - 5
+
+        let rot = (old_state >> ROTATE) as u32;
+        let xsh = (((old_state >> XSHIFT) ^ old_state) >> SPARE) as u32;
+        xsh.rotate_right(rot)
+    }
+
+    fn next_f32(&mut self) -> f32 {
+        let v = self.next();
+
+        // In C we'd do ldexp(v, -32) to bring a number in the range [0,2^32) down to [0,1) range.
+        // But as we don't have ldexp in Rust, we're implementing the same idea (subtracting 32
+        // from the floating point exponent) manually.
+
+        // First, extract exponent bits
+        let float_bits = (v as f64).to_bits();
+        let exponent = (float_bits >> 52) & ((1 << 11) - 1);
+
+        // Set exponent for [0-1) range
+        let new_exponent = exponent.max(32) - 32;
+
+        // Build the new f64 value from the old mantissa and sign, and the new exponent
+        let new_bits = (new_exponent << 52) | (float_bits & 0x801F_FFFF_FFFF_FFFFu64);
+
+        f64::from_bits(new_bits) as f32
+    }
+
+    // Produces a random vector with x and y in the [-1,1) range
+    // Note: Vector is not normalized.
+    fn rand_dir(&mut self) -> Point {
+        let x = self.next_f32();
+        let y = self.next_f32();
+
+        Point::new(x * 2.0 - 1.0, y * 2.0 - 1.0)
+    }
+
+    fn rand_dir_normalized(&mut self) -> Point {
+        let mut v = self.rand_dir();
+        v.normalize();
+        v
+    }
+}

src/renderer/cursor_renderer/mod.rs

@@ -2,17 +2,54 @@ use std::time::{Duration, Instant};
 
 use skulpin::skia_safe::{Canvas, Paint, Path, Point};
 
+use crate::settings::*;
 use crate::renderer::CachingShaper;
 use crate::editor::{EDITOR, Colors, Cursor, CursorShape};
 use crate::redraw_scheduler::REDRAW_SCHEDULER;
 
-const AVERAGE_MOTION_PERCENTAGE: f32 = 0.7;
-const MOTION_PERCENTAGE_SPREAD: f32 = 0.5;
+mod animation_utils;
+use animation_utils::*;
+
+mod cursor_vfx;
+
 const COMMAND_LINE_DELAY_FRAMES: u64 = 5;
 const DEFAULT_CELL_PERCENTAGE: f32 = 1.0 / 8.0;
 
 const STANDARD_CORNERS: &[(f32, f32); 4] = &[(-0.5, -0.5), (0.5, -0.5), (0.5, 0.5), (-0.5, 0.5)];
 
+// ----------------------------------------------------------------------------
+
+#[derive(Clone)]
+pub struct CursorSettings {
+    animation_length: f32,
+    trail_size: f32,
+    vfx_mode: cursor_vfx::VfxMode,
+    vfx_opacity: f32,
+    vfx_particle_lifetime: f32,
+    vfx_particle_density: f32,
+}
+
+pub fn initialize_settings() {
+    
+    SETTINGS.set(&CursorSettings {
+        animation_length: 0.13,
+        trail_size: 0.7,
+        vfx_mode: cursor_vfx::VfxMode::Disabled,
+        vfx_opacity: 200.0,
+        vfx_particle_lifetime: 1.2,
+        vfx_particle_density: 7.0,
+    });
+    
+    register_nvim_setting!("cursor_animation_length", CursorSettings::animation_length);
+    register_nvim_setting!("cursor_trail_size", CursorSettings::trail_size);
+    register_nvim_setting!("cursor_vfx_mode", CursorSettings::vfx_mode);
+    register_nvim_setting!("cursor_vfx_opacity", CursorSettings::vfx_opacity);
+    register_nvim_setting!("cursor_vfx_particle_lifetime", CursorSettings::vfx_particle_lifetime);
+    register_nvim_setting!("cursor_vfx_particle_density", CursorSettings::vfx_particle_density);
+}
+
+// ----------------------------------------------------------------------------
+
 enum BlinkState {
     Waiting,
     On,
@@ -85,47 +122,89 @@ impl BlinkStatus {
 
 #[derive(Debug, Clone)]
 pub struct Corner {
-    pub current_position: Point,
-    pub relative_position: Point,
+    start_position: Point,
+    current_position: Point,
+    relative_position: Point,
+    previous_destination: Point, 
+    t: f32,
 }
 
 impl Corner {
-    pub fn new(relative_position: Point) -> Corner {
+    pub fn new() -> Corner {
         Corner {
+            start_position: Point::new(0.0, 0.0),
             current_position: Point::new(0.0, 0.0),
-            relative_position
+            relative_position: Point::new(0.0, 0.0),
+            previous_destination: Point::new(-1000.0, -1000.0),
+            t: 0.0,
         }
     }
 
-    pub fn update(&mut self, font_dimensions: Point, destination: Point) -> bool {
-        let relative_scaled_position: Point = 
-            (self.relative_position.x * font_dimensions.x, self.relative_position.y * font_dimensions.y).into();
+    pub fn update(&mut self, settings: &CursorSettings, font_dimensions: Point, destination: Point, dt: f32) -> bool {
+        // Update destination if needed
+        let mut immediate_movement = false;
+        if destination != self.previous_destination {
+            let travel_distance = destination - self.previous_destination;
+            let chars_travel_x = travel_distance.x / font_dimensions.x;
+            if travel_distance.y == 0.0 && (chars_travel_x - 1.0).abs() < 0.1 {
+                // We're moving one character to the right. Make movement immediate to avoid lag
+                // while typing
+                immediate_movement = true;
+            }
+            self.t = 0.0;
+            self.start_position = self.current_position;
+            self.previous_destination = destination;
+        }
+
+        // Check first if animation's over
+        if self.t > 1.0 {
+            return false;
+        }
+
+        // Calculate window-space destination for corner
+        let relative_scaled_position: Point = (
+            self.relative_position.x * font_dimensions.x,
+            self.relative_position.y * font_dimensions.y,
+        ).into();
+
         let corner_destination = destination + relative_scaled_position;
 
-        let delta = corner_destination - self.current_position;
+        if immediate_movement {
+            self.t = 1.0;
+            self.current_position = corner_destination;
+            return true;
+        }
+
+        // Calculate how much a corner will be lagging behind based on how much it's aligned
+        // with the direction of motion. Corners in front will move faster than corners in the
+        // back
+        let travel_direction = {
+            let mut d = destination - self.current_position;
+            d.normalize();
+            d
+        };
 
-        if delta.length() > 0.0 {
-            // Project relative_scaled_position (actual possition of the corner relative to the
-            // center of the cursor) onto the remaining distance vector. This gives us the relative
-            // distance to the destination along the delta vector which we can then use to scale the
-            // motion_percentage.
-            let motion_scale = delta.dot(relative_scaled_position) / delta.length() / font_dimensions.length();
+        let corner_direction = {
+            let mut d = self.relative_position;
+            d.normalize();
+            d
+        };
 
-            // The motion_percentage is then equal to the motion_scale factor times the
-            // MOTION_PERCENTAGE_SPREAD and added to the AVERAGE_MOTION_PERCENTAGE. This way all of
-            // the percentages are positive and spread out by the spread constant.
-            let motion_percentage = motion_scale * MOTION_PERCENTAGE_SPREAD + AVERAGE_MOTION_PERCENTAGE;
+        let direction_alignment = travel_direction.dot(corner_direction);
 
-            // Then the current_position is animated by taking the delta vector, multiplying it by
-            // the motion_percentage and adding the resulting value to the current position causing
-            // the cursor to "jump" toward the target destination. Since further away corners jump
-            // slower, the cursor appears to smear toward the destination in a satisfying and
-            // visually trackable way.
-            let delta = corner_destination - self.current_position;
-            self.current_position += delta * motion_percentage;
+
+        if self.t == 1.0 {
+            // We are at destination, move t out of 0-1 range to stop the animation
+            self.t = 2.0;
+        } else {
+            let corner_dt = dt * lerp(1.0, 1.0 - settings.trail_size, -direction_alignment);
+            self.t = (self.t + corner_dt / settings.animation_length).min(1.0)
         }
         
-        delta.length() > 0.001
+        self.current_position =
+            ease_point(ease_out_expo, self.start_position, corner_destination, self.t);
+
+        true
     }
 }
 
@@ -133,16 +212,23 @@ pub struct CursorRenderer {
     pub corners: Vec<Corner>,
     pub previous_position: (u64, u64),
     pub command_line_delay: u64,
-    blink_status: BlinkStatus
+    blink_status: BlinkStatus,
+    previous_cursor_shape: Option<CursorShape>,
+    cursor_vfx: Option<Box<dyn cursor_vfx::CursorVfx>>,
+    previous_vfx_mode: cursor_vfx::VfxMode,
 }
 
 impl CursorRenderer {
     pub fn new() -> CursorRenderer {
         let mut renderer = CursorRenderer {
-            corners: vec![Corner::new((0.0, 0.0).into()); 4],
+            corners: vec![Corner::new(); 4],
             previous_position: (0, 0),
             command_line_delay: 0,
-            blink_status: BlinkStatus::new()
+            blink_status: BlinkStatus::new(),
+            previous_cursor_shape: None,
+            //cursor_vfx: Box::new(PointHighlight::new(Point{x:0.0, y:0.0}, HighlightMode::Ripple)),
+            cursor_vfx: None,
+            previous_vfx_mode: cursor_vfx::VfxMode::Disabled,
         };
         renderer.set_cursor_shape(&CursorShape::Block, DEFAULT_CELL_PERCENTAGE);
         renderer
@@ -165,7 +251,10 @@ impl CursorRenderer {
                         // instead of the top.
                         CursorShape::Horizontal => (x, -((-y + 0.5) * cell_percentage - 0.5)).into()
                     },
+                    t: 0.0,
+                    start_position: corner.current_position,
                     .. corner
+
                 }
             })
             .collect::<Vec<Corner>>();
@@ -174,10 +263,20 @@ impl CursorRenderer {
     pub fn draw(&mut self, 
             cursor: Cursor, default_colors: &Colors, 
             font_width: f32, font_height: f32,
-            paint: &mut Paint, shaper: &mut CachingShaper, 
-            canvas: &mut Canvas) {
+            shaper: &mut CachingShaper, canvas: &mut Canvas,
+            dt: f32) {
         let render = self.blink_status.update_status(&cursor);
 
+        let settings = SETTINGS.get::<CursorSettings>();
+
+        if settings.vfx_mode != self.previous_vfx_mode {
+            self.cursor_vfx = cursor_vfx::new_cursor_vfx(&settings.vfx_mode);
+            self.previous_vfx_mode = settings.vfx_mode.clone();
+        }
+
+        let mut paint = Paint::new(skulpin::skia_safe::colors::WHITE, None);
+        paint.set_anti_alias(true);
+
         self.previous_position = {
             let editor = EDITOR.lock();
             let (_, grid_y) = cursor.position;
@@ -196,6 +295,7 @@ impl CursorRenderer {
             }
         };
         
+
         let (grid_x, grid_y) = self.previous_position;
 
         let (character, font_dimensions): (String, Point) = {
@@ -219,14 +319,31 @@ impl CursorRenderer {
         let destination: Point = (grid_x as f32 * font_width, grid_y as f32 * font_height).into();
         let center_destination = destination + font_dimensions * 0.5;
 
+        let new_cursor = Some(cursor.shape.clone());
+
+        if self.previous_cursor_shape != new_cursor {
+            self.previous_cursor_shape = new_cursor;
             self.set_cursor_shape(&cursor.shape, cursor.cell_percentage.unwrap_or(DEFAULT_CELL_PERCENTAGE)); 
        
+            if let Some(vfx) = self.cursor_vfx.as_mut() {
+                vfx.restart(center_destination);
+            }
+        }
+
         let mut animating = false;
         if !center_destination.is_zero() {
             for corner in self.corners.iter_mut() {
-                let corner_animating = corner.update(font_dimensions, center_destination);
-                animating = animating || corner_animating;
+                let corner_animating = corner.update(&settings, font_dimensions, center_destination, dt);
+                animating |= corner_animating;
             }
+
+            let vfx_animating = if let Some(vfx) = self.cursor_vfx.as_mut() {
+                vfx.update(&settings, center_destination, (font_width, font_height), dt)
+            }else{
+                false
+            };
+
+            animating |= vfx_animating;
         }
 
         if animating || self.command_line_delay != 0 {
@@ -257,6 +374,10 @@ impl CursorRenderer {
                 canvas.draw_text_blob(&blob, destination, &paint);
             }
             canvas.restore();
+            if let Some(vfx) = self.cursor_vfx.as_ref() {
+                vfx.render(&settings, canvas, &cursor, &default_colors, (font_width, font_height));
+            }
+
         }
     }
 }

src/renderer/mod.rs

@@ -6,13 +6,14 @@ use skulpin::skia_safe::gpu::SurfaceOrigin;
 use log::trace;
 
 mod caching_shaper;
-mod cursor_renderer;
+pub mod cursor_renderer;
 
 pub use caching_shaper::CachingShaper;
 
 use cursor_renderer::CursorRenderer;
 use crate::editor::{EDITOR, Style};
 
+
 pub struct Renderer {
     surface: Option<Surface>,
     paint: Paint,
@@ -107,7 +108,9 @@ impl Renderer {
         canvas.restore();
     }
 
-    pub fn draw(&mut self, gpu_canvas: &mut Canvas, coordinate_system_helper: &CoordinateSystemHelper) -> bool {
+    pub fn draw(&mut self, gpu_canvas: &mut Canvas, 
+        coordinate_system_helper: &CoordinateSystemHelper,
+        dt: f32) -> bool {
         trace!("Rendering");
         let ((draw_commands, should_clear), default_style, cursor, font_name, font_size) = {
             let mut editor = EDITOR.lock();
@@ -162,8 +165,7 @@ impl Renderer {
         self.cursor_renderer.draw(
             cursor, &default_style.colors, 
             self.font_width, self.font_height, 
-            &mut self.paint, &mut self.shaper,
-            gpu_canvas);
+            &mut self.shaper, gpu_canvas, dt);
 
         font_changed
     }

src/settings.rs

@@ -26,12 +26,15 @@ pub trait FromValue {
 // FromValue implementations for most typical types
 impl FromValue for f32 {
     fn from_value(&mut self, value: Value) {
-        if value.is_f32() {
+        if value.is_f64() {
             *self = value.as_f64().unwrap() as f32; 
+        }else if value.is_i64() {
+            *self = value.as_i64().unwrap() as f32; 
+        }else if value.is_u64() {
+            *self = value.as_u64().unwrap() as f32; 
         }else{
             error!("Setting expected an f32, but received {:?}", value);
         }
-
     }
 }
 
@@ -81,6 +84,8 @@ impl FromValue for bool {
     fn from_value(&mut self, value: Value) {
         if value.is_bool() {
             *self = value.as_bool().unwrap();
+        }else if value.is_u64() {
+            *self = value.as_u64().unwrap() != 0;
         }else{
             error!("Setting expected a string, but received {:?}", value);
         }

src/window.rs

@@ -244,7 +244,9 @@ impl WindowWrapper {
         if REDRAW_SCHEDULER.should_draw() || SETTINGS.get::<WindowSettings>().no_idle {
             let renderer = &mut self.renderer;
             if self.skulpin_renderer.draw(&self.window, |canvas, coordinate_system_helper| {
-                if renderer.draw(canvas, coordinate_system_helper) {
+                let dt = 1.0 / (SETTINGS.get::<WindowSettings>().refresh_rate as f32);
+
+                if renderer.draw(canvas, coordinate_system_helper, dt) {
                     handle_new_grid_size(current_size, &renderer)
                 }
             }).is_err() {