go-vector-tiler/recipe_example_test.go at main · flywave/go-vector-tiler · GitHub

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package tile

import (
	"fmt"
	"os"
	"path/filepath"
)

// ExampleMetadataGenerator 演示如何使用元数据生成器
func Example_metadataGenerator() {
	config := &Config{
		MinZoom: 0,
		MaxZoom: 14,
	}

	outputPath := filepath.Join(os.TempDir(), "metadata.json")
	generator := NewMetadataGenerator(config, outputPath)
	generator.SetSourceURL("http://example.com/tiles/{z}/{x}/{y}.mvt")

	schemas := []LayerSchema{
		{
			Name:      "buildings",
			Fields:    []FieldInfo{{Name: "id", Type: "int"}, {Name: "name", Type: "string"}, {Name: "height", Type: "float"}},
			FeatureID: "id",
			MinZoom:   10,
			MaxZoom:   14,
		},
		{
			Name:      "roads",
			Fields:    []FieldInfo{{Name: "id", Type: "int"}, {Name: "type", Type: "string"}},
			FeatureID: "id",
			MinZoom:   5,
			MaxZoom:   14,
		},
	}

	if err := generator.GenerateToFile(schemas); err != nil {
		fmt.Printf("生成元数据失败: %v\n", err)
		return
	}

	fmt.Printf("元数据已生成到: %s\n", outputPath)
}

// ExampleMVTExporterWithMetadata 演示如何使用带元数据生成的MVT导出器
func Example_mvtExporterWithMetadata() {
	options := MVTOptions{
		FileMode:         0644,
		DirMode:          0755,
		Proto:            0,
		UseEmptyTile:     true,
		SkipEmptyTiles:   false,
		BufferSize:       16384,
		GenerateMetadata: true,
		MetadataPath:     "metadata.json",
		SourceURL:        "http://example.com/tiles/{z}/{x}/{y}.mvt",
	}

	exporter := NewMVTExporterWithOptions(options)

	schemas := []LayerSchema{
		{
			Name:      "pois",
			Fields:    []FieldInfo{{Name: "id", Type: "int"}, {Name: "name", Type: "string"}, {Name: "category", Type: "string"}},
			FeatureID: "id",
		},
	}

	config := &Config{
		MinZoom: 0,
		MaxZoom: 14,
	}

	outputDir := filepath.Join(os.TempDir(), "tiles")
	if err := exporter.GenerateMetadata(schemas, config, outputDir); err != nil {
		fmt.Printf("生成元数据失败: %v\n", err)
		return
	}

	fmt.Printf("元数据已生成到: %s\n", filepath.Join(outputDir, "metadata.json"))
}

// ExampleTilerWithMetadata 演示如何在Tiler中使用元数据生成
func Example_tilerWithMetadata() {
	options := MVTOptions{
		GenerateMetadata: true,
		MetadataPath:     "metadata.json",
		SourceURL:        "http://example.com/tiles/{z}/{x}/{y}.mvt",
	}

	exporter := NewMVTExporterWithOptions(options)

	config := &Config{
		Provider:    nil,
		MinZoom:     0,
		MaxZoom:     14,
		Concurrency: 4,
		OutputDir:   "./tiles",
		Exporter:    exporter,
	}

	tiler, err := NewTiler(config)
	if err != nil {
		fmt.Printf("创建Tiler失败: %v\n", err)
		return
	}

	if err := tiler.Tiler(); err != nil {
		fmt.Printf("生成瓦片失败: %v\n", err)
		return
	}

	fmt.Println("瓦片和元数据生成完成")
}

// ExampleLayerMetaBuilder 演示如何使用LayerMeta构建器模式
func Example_layerMetaBuilder() {
	layer := NewLayerMeta(5, 14).
		SetSource("http://example.com/tiles").
		SetIDField("id").
		AddFields("id", "name", "category", "value").
		SetFilter([]interface{}{"==", "type", "building"})

	meta := NewMetadataConfig()
	meta.AddLayer("buildings", *layer)

	jsonStr, err := meta.ToJSON()
	if err != nil {
		fmt.Printf("生成JSON失败: %v\n", err)
		return
	}

	fmt.Println("生成的元数据JSON:")
	fmt.Println(jsonStr)
}