feat: support background transparency (#4)

lvisei · Apr 29, 2022 · c129408 · c129408
1 parent 8205c18
commit c129408
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diff --git a/.gitignore b/.gitignore
@@ -20,5 +20,5 @@
 
 out
 image2tiles
-!image2tiles
+!image2tiles/
 
diff --git a/README.md b/README.md
@@ -1,7 +1,13 @@
 # image2tiles
 
+[![GoDoc](https://godoc.org/github.com/lvisei/image2tiles?status.svg)](https://pkg.go.dev/github.com/lvisei/image2tiles)
+[![Go Report Card](https://goreportcard.com/badge/github.com/lvisei/image2tiles)](https://goreportcard.com/report/github.com/lvisei/image2tiles)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
 image2tiles is a tool to cut large image into square tiles, to be used for a interactive tiled viewer.
 
+There are many high-performant viewing of large image available，but cropping and slicing images may be trouble. image2tiles support custom tile size and creates all tiles to be used by map tool like [leaflet](https://lvisei.github.io/image2tiles/leaflet.html), [openlayers](https://lvisei.github.io/image2tiles/openlayers.html) or Other.
+
 ## Command Line
 
 ### How to get
@@ -38,7 +44,7 @@ Usage: image2tiles -f <filename> [-s] [-t] [-b] [-o]
 
 Options:
   -b string
-        The background color to be used for the tiles (default "#FFF")
+        The background color to be used for the tiles (default "#ffffff00")
   -f string
         Image filename to be convert
   -o string
@@ -57,7 +63,7 @@ go get github.com/lvisei/image2tiles
 
 ### Usage
 
-Image into small single tiles
+Image into small single tile
 
 ```go
 package main
@@ -70,7 +76,7 @@ import (
 func main() {
   converter := image2tiles.NewConverter()
 
-  if err := converter.Prepare("image.png", "#ffffff"); err != nil {
+  if err := converter.Prepare("image.png", "#fff"); err != nil {
       fmt.Println(err)
   }
 
@@ -83,7 +89,7 @@ func main() {
 
 ```
 
-Image into small multiple tiles
+Image into multiple small tiles
 
 ```go
 package main
@@ -96,7 +102,7 @@ import (
 func main() {
   converter := image2tiles.NewConverter()
 
-  if err := converter.Prepare("image.png", "#ffffff"); err != nil {
+  if err := converter.Prepare("image.png", "#00000000"); err != nil {
       fmt.Println(err)
   }
 
@@ -109,8 +115,6 @@ func main() {
 
 ```
 
-
-
 ## LICENSE
 
 [MIT](./LICENSE)
diff --git a/cmd/image2tiles/main.go b/cmd/image2tiles/main.go
@@ -20,7 +20,7 @@ var (
 	imageFilename   = flag.String("f", "", "Image file name")
 	tileSize        = flag.Int("s", 512, "The tile height/width")
 	output          = flag.String("o", "out/%d/%d-%d.jpg", "Output file pattern")
-	backgroundColor = flag.String("b", "#FFF", "The background color to be used for the tiles")
+	backgroundColor = flag.String("b", "#ffffff00", "The background color to be used for the tiles")
 )
 
 func main() {

diff --git a/docs/leaflet.html b/docs/leaflet.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <title>leaflet</title>
+    <link
+      rel="stylesheet"
+      href="https://cdn.jsdelivr.net/npm/leaflet@1.8.0/dist/leaflet.css"
+    />
+    <style>
+      * {
+        margin: 0;
+        padding: 0;
+      }
+      #map {
+        width: 100%;
+        height: 100vh;
+      }
+    </style>
+    <script src="https://cdn.jsdelivr.net/npm/leaflet@1.8.0/dist/leaflet-src.min.js"></script>
+  </head>
+  <body>
+    <div id="map"></div>
+    <script type="text/javascript">
+      const map = L.map("map", {
+        crs: L.CRS.Simple,
+        attributionControl: false,
+      });
+
+      map.setView([-130, 130], 3);
+
+      L.tileLayer("tiles/{z}/{x}-{y}.png", { maxZoom: 4 }).addTo(map);
+    </script>
+  </body>
+</html>
diff --git a/docs/openlayers.html b/docs/openlayers.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <title>openlayers</title>
+    <link
+      rel="stylesheet"
+      href="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.14.1/css/ol.css"
+      type="text/css"
+    />
+    <style>
+      * {
+        margin: 0;
+        padding: 0;
+      }
+      #map {
+        width: 100%;
+        height: 100vh;
+      }
+    </style>
+    <script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.14.1/build/ol.js"></script>
+  </head>
+  <body>
+    <div id="map"></div>
+    <script type="text/javascript">
+      const source = new ol.source.Zoomify({
+        url: "tiles/{z}/{x}-{y}.png?",
+        size: [8192, 8192],
+        zDirection: -1, // Ensure we get a tile with the screen resolution or higher
+        tileSize: 512, // from a higher zoom level
+      });
+      const extent = source.getTileGrid().getExtent();
+
+      const layer = new ol.layer.Tile({
+        source: source,
+      });
+
+      const map = new ol.Map({
+        layers: [layer],
+        target: "map",
+        view: new ol.View({
+          // adjust zoom levels to those provided by the source
+          resolutions: layer.getSource().getTileGrid().getResolutions(),
+          // constrain the center: center cannot be set outside this extent
+          extent: extent,
+          constrainOnlyCenter: true,
+        }),
+      });
+
+      map.getView().fit(extent);
+    </script>
+  </body>
+</html>
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