add web server sample

README.md

@@ -1,7 +1,7 @@
 go-chart
 ========
 
-This project starts from a full copy from [https://github.com/wcharczuk/go-chart](https://github.com/wcharczuk/go-chart). 28 Oct 2024.
+This project starts from a full copy from [https://git.smarteching.com/zeni/go-chart](https://git.smarteching.com/zeni/go-chart). 28 Oct 2024.
 
 -
 
@@ -12,7 +12,7 @@ Master should now be on the v3.x codebase, which overhauls the api significantly
 To install `chart` run the following:
 
 ```bash
-> go get github.com/wcharczuk/go-chart/v2@latest
+> go get git.smarteching.com/zeni/go-chart/v2@latest
 ```
 
 Most of the components are interchangeable so feel free to crib whatever you want.
@@ -21,27 +21,27 @@ Most of the components are interchangeable so feel free to crib whatever you wan
 
 Spark Lines:
 
-![](https://raw.githubusercontent.com/wcharczuk/go-chart/master/_images/tvix_ltm.png)
+![](https://git.smarteching.com/zeni/go-chart/raw/branch/main/_images/tvix_ltm.png)
 
 Single axis:
 
-![](https://raw.githubusercontent.com/wcharczuk/go-chart/master/_images/goog_ltm.png)
+![](https://git.smarteching.com/zeni/go-chart/raw/branch/main/_images/goog_ltm.png)
 
 Two axis:
 
-![](https://raw.githubusercontent.com/wcharczuk/go-chart/master/_images/two_axis.png)
+![](https://git.smarteching.com/zeni/go-chart/raw/branch/main/_images/two_axis.png)
 
 # Other Chart Types
 
 Pie Chart:
 
-![](https://raw.githubusercontent.com/wcharczuk/go-chart/master/_images/pie_chart.png)
+![](https://git.smarteching.com/zeni/go-chart/raw/branch/main/_images/pie_chart.png)
 
 The code for this chart can be found in `examples/pie_chart/main.go`.
 
 Stacked Bar:
 
-![](https://raw.githubusercontent.com/wcharczuk/go-chart/master/_images/stacked_bar.png)
+![](https://git.smarteching.com/zeni/go-chart/raw/branch/main/_images/stacked_bar.png)
 
 The code for this chart can be found in `examples/stacked_bar/main.go`.
 
@@ -49,6 +49,8 @@ The code for this chart can be found in `examples/stacked_bar/main.go`.
 
 Actual chart configurations and examples can be found in the `./examples/` directory. They are simple CLI programs that write to `output.png` (they are also updated with `go generate`.
 
+If folder ends in "web", has web servers, so start them with `go run main.go` then access `http://localhost:8080` to see the output.
+
 # Usage
 
 Everything starts with the `chart.Chart` object. The bare minimum to draw a chart would be the following:
@@ -59,7 +61,7 @@ import (
     ...
     "bytes"
     ...
-    "github.com/wcharczuk/go-chart/v2" //exposes "chart"
+    "git.smarteching.com/zeni/go-chart/v2" //exposes "chart"
 )
 
 graph := chart.Chart{

examples/bar_chart_web/main.go

@@ -0,0 +1,55 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	graph := chart.BarChart{
+		Title: "Test Bar Chart",
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top: 40,
+			},
+		},
+		Height:   512,
+		BarWidth: 60,
+		Bars: []chart.Value{
+			{Value: 5.25, Label: "Blue"},
+			{Value: 4.88, Label: "Green"},
+			{Value: 4.74, Label: "Gray"},
+			{Value: 3.22, Label: "Orange"},
+			{Value: 3, Label: "Test"},
+			{Value: 2.27, Label: "??"},
+			{Value: 1, Label: "!!"},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	err := graph.Render(chart.PNG, res)
+	if err != nil {
+		fmt.Printf("Error rendering chart: %v\n", err)
+	}
+
+}
+
+func port() string {
+	if len(os.Getenv("PORT")) > 0 {
+		return os.Getenv("PORT")
+	}
+	return "8080"
+}
+
+func main() {
+	listenPort := fmt.Sprintf(":%s", port())
+	fmt.Printf("Listening on %s\n", listenPort)
+	http.HandleFunc("/", drawChart)
+	log.Fatal(http.ListenAndServe(listenPort, nil))
+}

examples/pie_chart_web/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	pie := chart.PieChart{
+		Width:  512,
+		Height: 512,
+		Values: []chart.Value{
+			{Value: 5, Label: "Blue"},
+			{Value: 5, Label: "Green"},
+			{Value: 4, Label: "Gray"},
+			{Value: 4, Label: "Orange"},
+			{Value: 3, Label: "Deep Blue"},
+			{Value: 3, Label: "??"},
+			{Value: 1, Label: "!!"},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	err := pie.Render(chart.PNG, res)
+	if err != nil {
+		fmt.Printf("Error rendering pie chart: %v\n", err)
+	}
+}
+
+func drawChartRegression(res http.ResponseWriter, req *http.Request) {
+	pie := chart.PieChart{
+		Width:  512,
+		Height: 512,
+		Values: []chart.Value{
+			{Value: 5, Label: "Blue"},
+			{Value: 2, Label: "Two"},
+			{Value: 1, Label: "One"},
+		},
+	}
+
+	res.Header().Set("Content-Type", chart.ContentTypeSVG)
+	err := pie.Render(chart.SVG, res)
+	if err != nil {
+		fmt.Printf("Error rendering pie chart: %v\n", err)
+	}
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.HandleFunc("/reg", drawChartRegression)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}