fix typos

add routine for resizing an image using imagick

magickwand.go

@@ -0,0 +1,54 @@
+// magickwand.go
+package main
+
+import (
+	"math"
+
+	"github.com/gographics/imagick/imagick"
+)
+
+func resizeImage(mw *imagick.MagickWand, newWidth, newHeight int, keepExactSize, center bool) (resmw *imagick.MagickWand) {
+	var (
+		width, height int
+	)
+	origHeight := int(mw.GetImageHeight())
+	origWidth := int(mw.GetImageWidth())
+
+	if (origHeight != newHeight) || (origWidth != newWidth) {
+		if (round((origHeight / origWidth) * newWidth)) <= newHeight {
+			height = round((float64(origHeight) / float64(origWidth))) * newWidth
+			width = newWidth
+		} else {
+			width = round((float64(origWidth) / float64(origHeight))) * newHeight
+			height = newHeight
+		}
+	} else {
+		height = newHeight
+		width = newWidth
+	}
+
+	if !keepExactSize {
+		resmw.SetSize(width, height)
+		center = false
+	} else {
+		resmw.SetSize(newWidth, newHeight)
+		if center {
+			err = mw.ResizeImage(width, height, imagick.FILTER_LANCZOS, 1)
+			if err != nil {
+				panic(err)
+			}
+			resmw.CompositeImage(mw, imagick.COMPOSITE_OP_SRC_OVER, uint((width-newWidth)/2), uint((height-newHeight)/2))
+		} else {
+			resmw.CompositeImage(mw, imagick.COMPOSITE_OP_SRC_OVER, 0, 0)
+		}
+	}
+	mw.Destroy()
+	return
+}
+
+func round(a float64) int {
+	if a < 0 {
+		return int(math.Ceil(a - 0.5))
+	}
+	return int(math.Floor(a + 0.5))
+}

main.go

@@ -53,6 +53,7 @@ func main() {
 }*/
 
 func run() error {
+	var mainQml qml.Object
 
 	engine := qml.NewEngine()
 	path, err = osext.ExecutableFolder()
@@ -142,7 +143,7 @@ func glInit() {
 func setSignals() {
 	textEdit.ObjectByName("textEdit1").On("focusChanged", func(focus bool) {
 		var (
-			tr  string
+			str string
 			cel cell
 		)