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another code example

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Martin Preuss
2026-01-04 19:17:49 +01:00
parent 9d010c254c
commit aefbc413a6
1 changed files with 42 additions and 2 deletions
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README.md
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@@ -25,8 +25,9 @@ sudo gwbuild -i
```
## Code Example
## Code Examples
### Simple Graph with a Single Curve
```
AQDG_GRAPH *g;
@@ -36,12 +37,51 @@ sudo gwbuild -i
g=AQDG_TimeGraph_new("Title", "Subtitle", "Value", "mm", 0);
/* get data to be shown (insert your function here) */
dpList=CREATE_DATA_FOR_GRAPH();
/* add single curve as line graph */
AQDG_TimeGraph_AddCurve(g, "Testdata", AQDG_GRAPH_TYPE_LINE, dpList);
/* setup ticks for X and Y axis (use auto-calculated upper and lower limit) */
AQDG_TimeGraph_SetupTicks(g, 0, 0.0, 0.0);
/* draw graph as PNG file (here with 800x600 pixels) */
dc=AQDG_Draw_ContextCairo_Png_new("/tmp/testgraph.png", 800, 600);
graphObject=AQDG_GraphWidget_new(NULL, AQDG_OBJECT_OPTIONS_STRETCHX | AQDG_OBJECT_OPTIONS_STRETCHY, dc);
AQDG_Object_SetWidth(graphObject, 800);
AQDG_Object_SetHeight(graphObject, 600);
/* use default pens and graphs */
AQDG_GraphWidget_SetupDefaultPens(graphObject);
AQDG_GraphWidget_SetupDefaultFonts(graphObject);
/* finish creating the PNG file */
AQDG_GraphWidget_FinishWithGraph(graphObject, g);
return 0;
```
### Graph with a Bar Graph and a Derived Line Curve
```
AQDG_GRAPH *g;
AQDG_GRAPH_DATAPAIR_LIST *dpList;
AQDG_GRAPH_DATAPAIR_LIST *derivedDpList;
AQDG_DRAW_CONTEXT *dc;
AQDG_OBJECT *graphObject;
g=AQDG_TimeGraph_new("Title", "Subtitle", "Value", "mm", 0);
/* get data to be shown (insert your function here) */
dpList=CREATE_DATA_FOR_GRAPH();
/* add first curve as bar graph */
AQDG_TimeGraph_AddCurve(g, "Testdata", AQDG_GRAPH_TYPE_BARS, dpList);
/* use a data modification function on initial data (hee: accumulate) */
/* use a data modification function on initial data (here: accumulate) */
derivedDpList=AQDG_Data_Accumulate(dpList);
/* add 2nd curve with accumulated data as line graph */