1 files changed, 44 insertions(+), 0 deletions(-)

A resize/resize.go

@@ 0,0 1,44 @@
+// The resize package resize the image to expected size
+// base on the ratio, for the most matched display
+package resize
+
+import (
+	"github.com/nfnt/resize"
+	"image"
+	"image/jpeg"
+	"log"
+	"os"
+	"runtime"
+)
+
+// Resize the convert to expected size base on the ratio
+func ScaleImage(image image.Image, ratio float64) (newImage image.Image) {
+	sz := image.Bounds()
+	newWidth := int(float64(sz.Max.X) * ratio)
+	newHeight := int(float64(sz.Max.Y) * ratio * charWidth())
+
+	newImage = resize.Resize(uint(newWidth), uint(newHeight), image, resize.Lanczos3)
+	out, err := os.Create("test_resized.jpg")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer out.Close()
+
+	// write new image to file
+	jpeg.Encode(out, newImage, nil)
+	return
+}
+
+// Get the terminal char width on different system
+func charWidth() float64 {
+	if isWindows() {
+		return 0.714
+	} else {
+		return 0.625
+	}
+}
+
+// Check if current system is windows
+func isWindows() bool {
+	return runtime.GOOS == "windows"
+}