From 937fe8f62ce4eb75a01bd740ed6fe9c71532bb63 Mon Sep 17 00:00:00 2001
From: Ivan Mahonin <bh@icystar.com>
Date: Aug 18 2023 06:47:55 +0000
Subject: #assistants: improve ruler marks


---

diff --git a/toonz/sources/tnztools/assistants/assistantline.cpp b/toonz/sources/tnztools/assistants/assistantline.cpp
index a306f7b..1b464aa 100644
--- a/toonz/sources/tnztools/assistants/assistantline.cpp
+++ b/toonz/sources/tnztools/assistants/assistantline.cpp
@@ -159,13 +159,14 @@ public:
 private:
   void drawRuler(const TPointD &a, const TPointD &b, double pixelSize, bool perspective) const {
     double minStep = 10.0*pixelSize;
-    double alpha = getDrawingGridAlpha();
+    double alpha = getDrawingAlpha();
 
     TPointD direction = b - a;
     double l2 = norm2(direction);
     if (l2 <= TConsts::epsilon*TConsts::epsilon) return;
     double dirLen = sqrt(l2);
     TPointD dirProj = direction*(1.0/l2);
+    TPointD markOffset = TPointD(-direction.y, direction.x)*(5*pixelSize/dirLen);
 
     double xg0 = dirProj*(m_grid0.position - a);
     double xg1 = dirProj*(m_grid1.position - a);
@@ -175,14 +176,18 @@ private:
       double xa0 = dirProj*(m_a.position - a);
       double k = 0.0, begin = 0.0, end = 0.0;
       if (!calcPerspectiveStep(minStep/dirLen, 0.0, 1.0, xa0, xg0, xg1, k, begin, end)) return;
-      for(double x = begin; fabs(x) < fabs(end); x *= k)
-        drawDot(a + direction*(xa0 + x), alpha);
+      for(double x = begin; fabs(x) < fabs(end); x *= k) {
+        TPointD p = a + direction*(xa0 + x);
+        drawSegment(p - markOffset, p + markOffset, pixelSize, alpha);
+      }
     } else {
       // draw linear
       double dx = fabs(xg1 - xg0);
       if (dx*dirLen < minStep) return;
-      for(double x = xg0 - floor(xg0/dx)*dx; x < 1.0; x += dx)
-        drawDot(a + direction*x, alpha);
+      for(double x = xg0 - floor(xg0/dx)*dx; x < 1.0; x += dx) {
+        TPointD p = a + direction*x;
+        drawSegment(p - markOffset, p + markOffset, pixelSize, alpha);
+      }
     }
   }