Fix a bug + add changelog + change tests

Author: schaumb

CHANGELOG.md

@@ -10,6 +10,10 @@
   - Axis: line, title, labels, guides, interlacing, ticks
   - Legend: title, dimension markers, measure extrema labels
   - Marker: line with connections
+- Fix negative ranges on x, y, color (measure) and lightness.
+- Fix axis step parameter if not match with the range sign (neg/pos).
+- Fix axis interpolation. From now the axis and axis labels are following the markers.
+- Fix measure axis labels when the range started after the 2000th step value from origo. 
 
 ### Added
 

src/chart/generator/axis.cpp

@@ -1,6 +1,8 @@
 #include "axis.h"
 
 #include <algorithm>
+#include <cmath>
+#include <limits>
 #include <map>
 #include <optional>
 #include <string>

src/chart/rendering/drawinterlacing.cpp

@@ -10,6 +10,7 @@
 #include "base/geom/rect.h"
 #include "base/gfx/colortransform.h"
 #include "base/gfx/font.h"
+#include "base/math/floating.h"
 #include "base/math/range.h"
 #include "base/math/renard.h"
 #include "base/text/smartstring.h"
@@ -140,9 +141,11 @@ void DrawInterlacing::draw(
 
 		auto axisBottom = axis.origo() + stripWidth;
 
-		auto iMin = axisBottom > 0 ? static_cast<int>(
-		                std::floor(-axis.origo() / (2 * stripWidth)))
-		                           : 0;
+		auto iMin =
+		    axisBottom > 0 ? static_cast<int>(
+		        std::floor(-axis.origo() / (2 * stripWidth)))
+		                   : static_cast<int>(
+		                       (axis.range.getMin() - stepSize) / 2);
 
 		if (stripWidth <= 0) return;
 		auto interlaceCount = 0U;