Improve financial and park history graphs

distribution/changelog.txt

@@ -1,8 +1,11 @@
 0.4.14 (in development)
 ------------------------------------------------------------------------
 - Feature: [#15750] Allow using different types of park entrance in one park.
+- Feature: [#22414] Finance graphs can be resized.
 - Change: [#21659] Increase the Hybrid Roller Coaster’s maximum lift speed to 17 km/h (11 mph).
 - Change: [#22466] The Clear Scenery tool now uses a bulldozer cursor instead of a generic crosshair.
+- Fix: [#22307] Hover tooltips in financial charts are not invalidated properly.
+- Fix: [#22395, #22396] Misaligned tick marks in financial and guest count graphs (original bug).
 
 0.4.13 (2024-08-04)
 ------------------------------------------------------------------------

src/openrct2-ui/interface/Graph.h

@@ -9,14 +9,62 @@
 
 #pragma once
 
+#include <openrct2/Context.h>
 #include <openrct2/core/Money.hpp>
 #include <openrct2/drawing/Drawing.h>
 #include <openrct2/world/Location.hpp>
 
 namespace OpenRCT2::Graph
 {
-    void Draw(DrawPixelInfo& dpi, uint8_t* history, int32_t count, const ScreenCoordsXY& screenPos);
-    void Draw(
-        DrawPixelInfo& dpi, const money64* history, const int32_t count, const ScreenCoordsXY& coords, const int32_t modifier,
-        const int32_t offset);
+    template<typename T> struct GraphProperties
+    {
+        ScreenRect internalBounds;
+        const T* series;
+        T min;
+        T max;
+        int32_t hoverIdx;
+        int32_t numPoints;
+        int32_t numYLabels;
+        int32_t xStepPx;
+        int32_t yLabelStepPx;
+        ColourWithFlags lineCol;
+
+        void RecalculateLayout(const ScreenRect newBounds, const int32_t newNumYLabels, const int32_t newNumPoints)
+        {
+            yLabelStepPx = (newBounds.GetBottom() - newBounds.GetTop()) / (newNumYLabels - 1);
+            xStepPx = (newBounds.GetRight() - newBounds.GetLeft()) / (newNumPoints - 1);
+            // adjust bounds to be exact multiples of the steps.
+            internalBounds = { newBounds.Point1,
+                               newBounds.Point1
+                                   + ScreenCoordsXY{ xStepPx * (newNumPoints - 1), yLabelStepPx * (newNumYLabels - 1) } };
+            numPoints = newNumPoints;
+            numYLabels = newNumYLabels;
+        }
+
+        bool UpdateHoverIndex()
+        {
+            const ScreenCoordsXY cursorPos = ContextGetCursorPositionScaled();
+
+            int32_t i = -1;
+            if (internalBounds.Contains(cursorPos))
+            {
+                i = (numPoints - 1) - (cursorPos.x - internalBounds.GetLeft() + (xStepPx / 2)) / xStepPx;
+                if (i < 0)
+                    i = 1;
+                if (i > numPoints - 1)
+                    i = numPoints - 1;
+            }
+
+            if (hoverIdx != i)
+            {
+                hoverIdx = i;
+                return true;
+            }
+            return false;
+        }
+    };
+
+    void DrawFinanceGraph(DrawPixelInfo& dpi, const GraphProperties<money64>& p);
+    void DrawRatingGraph(DrawPixelInfo& dpi, const GraphProperties<uint8_t>& p);
+    void DrawGuestGraph(DrawPixelInfo& dpi, const GraphProperties<uint32_t>& p);
 } // namespace OpenRCT2::Graph