From bfe6a86bd5b1d02988dbd9a3bb5759854d76a050 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Mon, 24 May 2021 22:27:41 +0530
Subject: basic primitives to repeat last paint op

---
 src/app.rs | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'src/app.rs')

diff --git a/src/app.rs b/src/app.rs
index 3e7ac0f..d8a6132 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -257,6 +257,40 @@ impl<'ctx> AppState<'ctx> {
         }
     }
 
+    pub fn repeat_last_paint(&mut self, target: MapPoint) {
+        self.commit_operation();
+        if let Some(ModifyRecord::Paint(records)) = self
+            .undo_stack
+            .operations
+            .iter()
+            .rev()
+            .find(|&o| matches!(o, ModifyRecord::Paint(_)))
+        {
+            dbg!(target);
+            // find center of paint cluster
+            let centroid: MapPoint = records
+                .iter()
+                .fold(MapPoint { x: 0, y: 0 }, |acc, x| acc + x.point)
+                .reduce(records.len() as u32);
+            dbg!(centroid);
+            // re-center cluster around target
+            let centered_op = records
+                .iter()
+                .map(|x| PaintRecord {
+                    point: x.point + target - centroid,
+                    ..*x
+                })
+                .collect::<Vec<_>>();
+            let mut ud = Vec::new();
+            for r in &centered_op {
+                let p = r.point;
+                let v = r.new;
+                ud.push(PaintRecord::new(p, self.pixmap.set(p, v), v));
+            }
+            self.undo_stack.push(ModifyRecord::Paint(ud));
+        }
+    }
+
     pub fn zoom_in(&mut self, p: (i32, i32)) {
         // attempt to center around cursor
         if let Some(p) = self.idx_at_coord(p) {
@@ -774,6 +808,11 @@ impl<'ctx> AppState<'ctx> {
                                         let cursor = (mouse.x(), mouse.y());
                                         self.zoom_out(cursor);
                                     }
+                                    Keycode::Period => {
+                                        if let Some(contact) = self.idx_at_coord(self.mouse) {
+                                            self.repeat_last_paint(contact.into());
+                                        }
+                                    }
                                     // brush ops
                                     Keycode::Q => self.brush.shrink(),
                                     Keycode::E => self.brush.grow(),
-- 
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