working cursor smear

src/renderer/cursor_renderer.rs

@@ -1,17 +1,16 @@
 use std::sync::{Arc, Mutex};
 
-use skulpin::skia_safe::{Canvas, Paint, Point};
-use skulpin::skia_safe::canvas::PointMode;
+use skulpin::skia_safe::{Canvas, Paint, Path, Point};
 
 use crate::renderer::{CachingShaper, FontLookup};
 use crate::editor::{Colors, Cursor, CursorShape, Editor};
 
-const average_motion_percentage: f32 = 0.5;
-const motion_percentage_spread: f32 = 0.3;
+const AVERAGE_MOTION_PERCENTAGE: f32 = 0.8;
+const MOTION_PERCENTAGE_SPREAD: f32 = 0.5;
 
-const bar_width: f32 = 1.0 / 8.0;
+const BAR_WIDTH: 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)];
+const STANDARD_CORNERS: &[(f32, f32); 4] = &[(-0.5, -0.5), (0.5, -0.5), (0.5, 0.5), (-0.5, 0.5)];
 
 #[derive(Debug, Clone)]
 pub struct Corner {
@@ -34,11 +33,13 @@ impl Corner {
 
         let delta = corner_destination - self.current_position;
 
-        let motion_scale = delta.dot(relative_scaled_position) / delta.length() / font_dimensions.length();
-        let motion_percentage = motion_scale * motion_percentage_spread + average_motion_percentage;
+        if delta.length() > 0.0 {
+            let motion_scale = delta.dot(relative_scaled_position) / delta.length() / font_dimensions.length();
+            let motion_percentage = motion_scale * MOTION_PERCENTAGE_SPREAD + AVERAGE_MOTION_PERCENTAGE;
 
-        let delta = corner_destination - self.current_position;
-        self.current_position += delta * motion_percentage;
+            let delta = corner_destination - self.current_position;
+            self.current_position += delta * motion_percentage;
+        }
 
         delta.length() > 0.001
     }
@@ -53,21 +54,21 @@ impl CursorRenderer {
         let mut renderer = CursorRenderer {
             corners: vec![Corner::new((0.0, 0.0).into()); 4]
         };
-        renderer.set_cursor_shape(CursorShape::Block);
+        renderer.set_cursor_shape(&CursorShape::Block);
         renderer
     }
 
-    fn set_cursor_shape(&mut self, cursor_shape: CursorShape) {
+    fn set_cursor_shape(&mut self, cursor_shape: &CursorShape) {
         self.corners = self.corners
             .clone()
             .into_iter().enumerate()
             .map(|(i, corner)| {
-                let (x, y) = standard_corners[i];
+                let (x, y) = STANDARD_CORNERS[i];
                 Corner {
                     relative_position: match cursor_shape {
                         CursorShape::Block => (x, y).into(),
-                        CursorShape::Vertical => ((x + 0.5) * bar_width - 0.5, y).into(),
-                        CursorShape::Horizontal => (x, (y + 0.5) * bar_width - 0.5).into()
+                        CursorShape::Vertical => ((x + 0.5) * BAR_WIDTH - 0.5, y).into(),
+                        CursorShape::Horizontal => (x, (y + 0.5) * BAR_WIDTH - 0.5).into()
                     },
                     .. corner
                 }
@@ -84,33 +85,46 @@ impl CursorRenderer {
         let (grid_x, grid_y) = cursor.position;
         let font_dimensions: Point = (font_width, font_height).into();
         let center_destination: Point = (
-            grid_x as f32 * (font_width * 1.5), 
-            grid_y as f32 * (font_height * 1.5)
+            grid_x as f32 * font_width + font_width / 2.0, 
+            grid_y as f32 * font_height + font_height / 2.0
         ).into();
 
+        self.set_cursor_shape(&cursor.shape);
+
         let mut animating = false;
-        for corner in self.corners.iter_mut() {
-            let corner_animating = corner.update(font_dimensions, center_destination);
-            animating = animating || corner_animating;
+        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;
+            }
         }
 
+
         if cursor.enabled {
             // Draw Background
             paint.set_color(cursor.background(&default_colors).to_color());
-            canvas.draw_points(PointMode::Polygon, &self.corners.iter().map(|corner| corner.current_position).collect::<Vec<_>>(), &paint);
+
+            let mut path = Path::new();
+            path.move_to(self.corners[0].current_position);
+            path.line_to(self.corners[1].current_position);
+            path.line_to(self.corners[2].current_position);
+            path.line_to(self.corners[3].current_position);
+            path.close();
+
+            canvas.draw_path(&path, &paint);
 
             let mut position_sum: Point = (0.0, 0.0).into();
             for i in 0..4 {
                 position_sum += self.corners[i].current_position;
             }
-            let Point { x: cursor_x, y: cursor_y } = position_sum * (1.0 / 4.0);
+            let Point { x: cursor_x, y: cursor_y } = position_sum * (1.0 / 4.0) - font_dimensions * 0.5;
 
             // Draw foreground
             if let CursorShape::Block = cursor.shape {
                 let (cursor_grid_y, cursor_grid_x) = cursor.position;
                 paint.set_color(cursor.foreground(&default_colors).to_color());
                 let editor = editor.lock().unwrap();
-                let character = editor.grid[cursor_grid_y as usize][cursor_grid_x as usize].clone()
+                let character = editor.grid[cursor_grid_x as usize][cursor_grid_y as usize].clone()
                     .map(|(character, _)| character)
                     .unwrap_or(' ');
                 canvas.draw_text_blob(

src/renderer/mod.rs

@@ -2,6 +2,7 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 use skulpin::CoordinateSystemHelper;
 use skulpin::skia_safe::{Canvas, Paint, Surface, Budgeted, Rect, Typeface, Font, FontStyle, colors};
+use skulpin::skia_safe::paint::Style as PaintStyle;
 use skulpin::skia_safe::gpu::SurfaceOrigin;
 
 mod caching_shaper;
@@ -102,6 +103,7 @@ impl Renderer {
         let surface = None;
         let mut paint = Paint::new(colors::WHITE, None);
         paint.set_anti_alias(false);
+        
         let mut fonts_lookup = FontLookup::new(FONT_NAME, FONT_SIZE);
         let shaper = CachingShaper::new();