Merge branch 'image_tiles' of github.com:AnkurGel/markpdf into AnkurG…

…el-image_tiles

README.md

@@ -56,7 +56,17 @@ markpdf "path/to/source.pdf" "img/logo.png" "path/to/output.pdf" -Wo 0.3
 # stretch full with of page at page bottom
 markpdf "path/to/source.pdf" "img/logo.png" "path/to/output.pdf" --scale-width --offset-y=-10
 markpdf "path/to/source.pdf" "img/logo.png" "path/to/output.pdf" -wy -10
-```
+
+# Scale the image to desired percentage
+markpdf "path/to/source.pdf" "img/logo.png" "path/to/output.pdf" --scale=30
+
+# Add image as tiles all over the page
+markpdf "path/to/source.pdf" "img/logo.png" "path/to/output.pdf" --tiles
+
+# Add image as tiles with interleaved spacing
+markpdf "path/to/source.pdf" "img/logo.png" "path/to/output.pdf" --tiles --spacing=20
+``
+
 
 ### Text watermarking
 
@@ -100,7 +110,7 @@ Currently the following font names are supported:
 - **Specifying Colors**: write them as 6 or 3 digit hexadecilal as used in CSS, without the #
 
 - `--color`, `--font` and `--font-size` flag has no impact for Image watermarking
-- `--scale-*` and `--opacity` flag has no impact for Text watermarking
+- `--scale-*`, `--tiles` and `--opacity` flag has no impact for Text watermarking
 - Negative offset will set content positioning from opposite side (right for offsetX and botom from offsetY)
 - Text with opacity is not supported at this moment. Instead, you can [create a transperent background PNG image](http://www.picturetopeople.org/text_generator/others/transparent/transparent-text-generator.html) with your text and then use it for watermarking.
 
@@ -114,7 +124,7 @@ Currently the following font names are supported:
 ✅ Configure image rotation angle  
 ✅ Options to Stretch watermark to page width or height, proportionately  
 ✅ Options to Stretch watermark to page width or height at the middle of page  
-◻️ Tile Image all over the page  
+✅ Tile Image all over the page  
 ✅ Render text on every page  
 ✅ Configure text color, style and font  
 ◻️ Configure text opacity  

img_watermark.go

@@ -8,9 +8,13 @@ import (
 )
 
 func drawImage(watermarkImg *creator.Image, c *creator.Creator) {
-	watermarkImg.SetPos(offsetX, offsetY)
 	watermarkImg.SetOpacity(opacity)
 	watermarkImg.SetAngle(angle)
+	if tiles {
+		repeatTiles(watermarkImg, c)
+		return
+	}
+	watermarkImg.SetPos(offsetX, offsetY)
 	_ = c.Draw(watermarkImg)
 }
 
@@ -20,9 +24,13 @@ func adjustImagePosition(watermarkImg *creator.Image, c *creator.Creator) {
 
 
 	if scaleImage != 100 {
-		debugInfo(fmt.Sprintf("Scaling to %v", scaleImage))
+		debugInfo(fmt.Sprintf("Scaling to %v%%", scaleImage))
 		watermarkImg.ScaleToHeight(scaleImage * watermarkImg.Width() / 100)
 	}
+	if tiles {
+		offsetX, offsetY = 0, 0
+		return
+	}
 	if scaleWCenter {
 		watermarkImg.ScaleToWidth(c.Context().PageWidth)
 		offsetX = 0

main.go

@@ -11,8 +11,8 @@ import (
 	"text/template"
 )
 
-var offsetX, offsetY, scaleImage, fontSize float64
-var scaleH, scaleW, scaleHCenter, scaleWCenter, center, verbose, version bool
+var offsetX, offsetY, scaleImage, fontSize, spacing float64
+var scaleH, scaleW, scaleHCenter, scaleWCenter, center, tiles, verbose, version bool
 var opacity, angle float64
 var font, color string
 
@@ -37,6 +37,9 @@ func init() {
 	flag.Float64VarP(&opacity, "opacity", "o", 0.5, "Opacity of watermark. float between 0 to 1.")
 	flag.Float64VarP(&angle, "angle", "a", 0, "Angle of rotation. between 0 to 360, counter clock-wise.")
 
+	flag.BoolVarP(&tiles, "tiles", "t", false, "Repeat watermark as tiles on page. All offsets will be ignored.")
+	flag.Float64VarP(&spacing, "spacing", "z", 0, "Repeat watermark as tiles on page. All offsets will be ignored.")
+
 	flag.BoolVarP(&verbose, "verbose", "v", false, "Display debug information.")
 	flag.BoolVarP(&version, "version", "V", false, "Display Version information.")
 

text_watermark.go

@@ -24,14 +24,24 @@ func drawText(p *creator.Paragraph, c *creator.Creator) {
 	p.SetColor(creator.ColorRGBFromHex("#" + color))
 	p.SetAngle(angle)
 
+	// Encountering problem with tiles and text watermark. Contributions welcome.
+	//if tiles {
+	//	repeatTiles(p, c)
+	//	return
+	//}
+
 	_ = c.Draw(p)
 }
 
 func adjustTextPosition(p *creator.Paragraph, c *creator.Creator) {
 	p.SetTextAlignment(creator.TextAlignmentLeft)
 	p.SetEnableWrap(false)
 
-	if center {
+	if tiles {
+		p.SetWidth(p.Width()) // Not working without setting it manually
+		p.SetTextAlignment(creator.TextAlignmentCenter)
+		offsetX, offsetY = 0, 0
+	} else if center {
 		p.SetWidth(p.Width()) // Not working without setting it manually
 		p.SetTextAlignment(creator.TextAlignmentCenter)
 

tiles.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"github.com/unidoc/unidoc/pdf/creator"
+	"math"
+)
+
+// Watermarkable is a common interface for watermarkable image or paragraph
+type Watermarkable interface {
+	creator.VectorDrawable
+	SetPos(x, y float64)
+}
+
+func repeatTiles(watermark Watermarkable, c *creator.Creator) {
+	w := watermark.Width()
+	h := watermark.Height()
+	pw := c.Context().PageWidth
+	ph := c.Context().PageHeight
+
+	nw := math.Ceil(pw / w)
+	nh := math.Ceil(ph / h)
+
+	debugInfo(fmt.Sprintf("Settings tiles of %v x %v", nw, nh))
+	for i := 0; i < int(nw); i++ {
+		x := w * float64(i)
+		for j := 0; j < int(nh); j++ {
+			y := h * float64(j)
+			watermark.SetPos(x + spacing * float64(i), y + spacing * float64(j))
+			err := c.Draw(watermark)
+			if err != nil {
+				fatalIfError(err, fmt.Sprintf("Error %s", err))
+			}
+		}
+	}
+}