From fb6af5ef1b0c9d4adcd6aac785742f4e4106c0c8 Mon Sep 17 00:00:00 2001
From: Martin Preuss <martin@aquamaniac.de>
Date: Tue, 30 Dec 2025 10:44:57 +0100
Subject: [PATCH] implemented vertical bars graph.

---
 src/lib/aqdiagram/graph/w_viewport.c | 98 +++++++++++++++++++++++-----
 1 file changed, 83 insertions(+), 15 deletions(-)

diff --git a/src/lib/aqdiagram/graph/w_viewport.c b/src/lib/aqdiagram/graph/w_viewport.c
index 8ab492c..eb612a0 100644
--- a/src/lib/aqdiagram/graph/w_viewport.c
+++ b/src/lib/aqdiagram/graph/w_viewport.c
@@ -40,6 +40,7 @@ static int _screenDistBetweenLevelTicksX(const AQDG_GRAPH_TICK_LIST *tickList, i
                                          int contentSize, double minValue, double maxValue);
 static int _screenDistBetweenLevelTicksY(const AQDG_GRAPH_TICK_LIST *tickList, int lvl,
                                          int contentSize, double minValue, double maxValue);
+static int _distToScreenDist(int contentSize, double minValue, double maxValue, double value);
 
 static void _drawCurveLines(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc, const AQDG_GRAPH_CURVE *curve,
                             double minValueX, double maxValueX, double minValueY, double maxValueY,
@@ -50,6 +51,9 @@ static void _drawCurvePoints(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc, const AQDG_G
 static void _drawCurveStepLines(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc, const AQDG_GRAPH_CURVE *curve,
                                 double minValueX, double maxValueX, double minValueY, double maxValueY,
                                 int pen);
+static void _drawCurveVertBars(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc, const AQDG_GRAPH_CURVE *curve,
+			       double minValueX, double maxValueX, double minValueY, double maxValueY,
+			       int pen);
 
 
 
@@ -193,6 +197,8 @@ void _drawCurve(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc, const AQDG_GRAPH_CURVE *c
     _drawCurveStepLines(o, dc, curve, minValueX, maxValueX, minValueY, maxValueY, pen);
     break;
   case AQDG_GRAPH_TYPE_BARS:
+    _drawCurveVertBars(o, dc, curve, minValueX, maxValueX, minValueY, maxValueY, pen);
+    break;
   default:
     break;
   }
@@ -327,12 +333,7 @@ void _drawHorizontalGrid(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc)
 int _screenDistBetweenLevelTicksX(const AQDG_GRAPH_TICK_LIST *tickList, int lvl,
                                  int contentSize, double minValue, double maxValue)
 {
-  double v;
-  int pts;
-
-  v=AQDG_Graph_Tick_List_DistanceBetweenTicks(tickList, lvl);
-  pts=(v*(contentSize/(maxValue-minValue)));
-  return pts;
+  return _distToScreenDist(contentSize, minValue, maxValue, AQDG_Graph_Tick_List_DistanceBetweenTicks(tickList, lvl));
 }
 
 
@@ -343,20 +344,23 @@ int _screenDistBetweenLevelTicksY(const AQDG_GRAPH_TICK_LIST *tickList, int lvl,
   const AQDG_GRAPH_TICK *firstLevelTick;
 
   firstLevelTick=AQDG_Graph_Tick_List_GetFirstTickForLevel(tickList, lvl);
-  if (firstLevelTick) {
-    double v;
-    int pts;
-
-    v=AQDG_Graph_Tick_GetLevelDist(firstLevelTick);
-    pts=(v*(contentSize/(maxValue-minValue)));
-    DBG_ERROR(NULL, "Level dist %d: %d", lvl, pts);
-    return pts;
-  }
+  if (firstLevelTick)
+    return _distToScreenDist(contentSize, minValue, maxValue, AQDG_Graph_Tick_GetLevelDist(firstLevelTick));
   return 0;
 }
 
 
 
+int _distToScreenDist(int contentSize, double minValue, double maxValue, double value)
+{
+  int pts;
+
+  pts=(value*(contentSize/(maxValue-minValue)));
+  return pts;
+}
+
+
+
 
 
 
@@ -489,6 +493,70 @@ void _drawCurveStepLines(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc, const AQDG_GRAPH
 
 
 
+void _drawCurveVertBars(AQDG_OBJECT *o, AQDG_DRAW_CONTEXT *dc, const AQDG_GRAPH_CURVE *curve,
+                        double minValueX, double maxValueX, double minValueY, double maxValueY,
+                        int pen)
+{
+  const AQDG_GRAPH_DATAPAIR_LIST *dpList;
+  const AQDG_GRAPH_DATAPAIR *dp;
+
+  dpList=AQDG_Graph_Curve_GetDataPairs(curve);
+  dp=dpList?AQDG_Graph_DataPair_List_First(dpList):NULL;
+  if (dp) {
+    int width;
+    int height;
+    int absX;
+    int absY;
+    double valueMinDist;
+    int barWidth;
+    double baseLineValueY;
+    int baseLinePosY;
+
+    absX=AQDG_Object_GetAbsoluteX(o);
+    absY=AQDG_Object_GetAbsoluteY(o);
+    width=AQDG_Object_GetWidth(o);
+    height=AQDG_Object_GetHeight(o);
+    valueMinDist=AQDG_Graph_DataPair_List_GetMinDiffX(dpList);
+    barWidth=_distToScreenDist(width, minValueX, maxValueX, (valueMinDist*5.0)/6.0);
+
+    if (maxValueY<0.0)
+      baseLineValueY=maxValueY;
+    else if (minValueY>0.0)
+      baseLineValueY=minValueY;
+    else
+      baseLineValueY=0.0;
+    baseLinePosY=_calcVerticalPos(baseLineValueY, height, minValueY, maxValueY);
+
+#if 0
+    DBG_ERROR(NULL,
+	      "valueMinDist=%.2f, barWidth=%d, baseLineValueY=%.2f, baseLinePosY=%d",
+	      valueMinDist, barWidth, baseLineValueY, baseLinePosY);
+#endif
+    while(dp) {
+      int xPos;
+      int yPos;
+      int h;
+      double xValue;
+      double yValue;
+
+      xValue=AQDG_Graph_DataPair_GetValueX(dp);
+      yValue=AQDG_Graph_DataPair_GetValueY(dp);
+
+      xPos=_calcHorizontalPos(xValue, width, minValueX, maxValueX)-barWidth/2;
+      yPos=_calcVerticalPos(yValue, height, minValueY, maxValueY);
+      h=baseLinePosY-yPos;
+      if (h<0) {
+	yPos+=h;
+	h=-h;
+      }
+      AQDG_Draw_Context_DrawFilledRect(dc, pen, absX+xPos, absY+yPos, barWidth, h);
+      dp=AQDG_Graph_DataPair_List_Next(dp);
+    }
+  }
+}
+
+
+