From 9b07407593412629a887e3cfc5c53b471b910d59 Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuelfadel@gmail.com>
Date: Fri, 15 Jan 2016 13:54:31 +0100
Subject: Scatterplot: visual update.

* Selection is now indicated with outline (black for selected
  points; white otherwise)
* Circle geometry now takes diameter as input (more related to
  glyph size)
---
 geometry.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'geometry.cpp')

diff --git a/geometry.cpp b/geometry.cpp
index 3a4a861..4ed01ee 100644
--- a/geometry.cpp
+++ b/geometry.cpp
@@ -2,20 +2,20 @@
 
 static const float PI = 3.1415f;
 
-int calculateCircleVertexCount(float radius)
+int calculateCircleVertexCount(float diameter)
 {
     // 10 * sqrt(r) \approx 2*pi / acos(1 - 1 / (4*r))
-    return int(10.0 * sqrt(radius));
+    return int(10.0 * sqrt(diameter / 2));
 }
 
-void updateCircleGeometry(QSGGeometry *geometry, float radius, float cx, float cy)
+void updateCircleGeometry(QSGGeometry *geometry, float diameter, float cx, float cy)
 {
     int vertexCount = geometry->vertexCount();
 
     float theta = 2 * PI / float(vertexCount);
     float c = cosf(theta);
     float s = sinf(theta);
-    float x = radius;
+    float x = diameter / 2;
     float y = 0;
 
     QSGGeometry::Point2D *vertexData = geometry->vertexDataAsPoint2D();
-- 
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