content_obj.go

package gopdf


import (
	"bytes"
	"strconv"
	"fmt"
)

type ContentObj struct { //impl IObj
	buffer bytes.Buffer
	stream  bytes.Buffer
	
	//text bytes.Buffer
	getRoot func()(*GoPdf)
}

func (me *ContentObj) Init(funcGetRoot func()(*GoPdf)) {
	me.getRoot = funcGetRoot
}

func (me *ContentObj) Build() {

	streamlen := me.stream.Len()
	me.buffer.WriteString("<<\n")
	me.buffer.WriteString("/Length "+strconv.Itoa(streamlen)+"\n")
	me.buffer.WriteString(">>\n")
	me.buffer.WriteString("stream\n")
	me.buffer.Write(me.stream.Bytes())
	me.buffer.WriteString("endstream\n")
}

func (me *ContentObj) GetType() string {
	return "Content"
}

func (me *ContentObj) GetObjBuff() *bytes.Buffer {
	return &(me.buffer)
}


func (me *ContentObj) AppendStream(rectangle *Rect,text string){
	
	
	fontSize := me.getRoot().Curr.Font_Size
	
	x := fmt.Sprintf("%0.2f",me.getRoot().Curr.X)
	y := fmt.Sprintf("%0.2f",me.getRoot().config.PageSize.H  - me.getRoot().Curr.Y - (float64(fontSize) *0.7) )
	
	me.stream.WriteString("BT\n")
	me.stream.WriteString(x+" "+y+" TD\n")
	me.stream.WriteString("/F"+strconv.Itoa( me.getRoot().Curr.Font_FontCount  + 1)+" "+ strconv.Itoa(fontSize)+" Tf\n")
	me.stream.WriteString("("+text+") Tj\n")
	me.stream.WriteString("ET\n")
	if rectangle == nil {
		me.getRoot().Curr.X += StrHelper_GetStringWidth(text,fontSize,me.getRoot().Curr.Font_IFont)
	}else{
		me.getRoot().Curr.X += rectangle.W
	}
	
}

func (me *ContentObj) AppendStreamLine(x1 float64 , y1 float64, x2 float64 , y2 float64){

	h := me.getRoot().config.PageSize.H
	me.stream.WriteString( fmt.Sprintf("%0.2f %0.2f m %0.2f %0.2f l s\n",x1,h - y1,x2,h - y2))
}

func (me *ContentObj) AppendUnderline(startX float64 , y float64,endX float64,endY float64, text string){

	h   := me.getRoot().config.PageSize.H
	ut  := me.getRoot().Curr.Font_IFont.GetUt()
	//up := me.getRoot().Curr.Font_IFont.GetUp()
	textH :=  ContentObj_CalTextHeight( me.getRoot().Curr.Font_Size)
	arg3 := float64(h) - float64( y) - textH  - textH*0.07
	arg4 := (float64(ut)/1000.00) * float64(me.getRoot().Curr.Font_Size)
	me.stream.WriteString(fmt.Sprintf("%0.2f %0.2f %0.2f -%0.2f re f\n",startX,arg3,endX - startX ,arg4))

	//fmt.Printf(" ut : %d  arg4 : -%0.2f", ut,arg4)
}

func (me *ContentObj) AppendStreamSetLineWidth(w float64){
	
	me.stream.WriteString(fmt.Sprintf("%.2f w\n",w))
	
}

func (me *ContentObj) AppendStreamImage(index int,x float64,y float64,rect *Rect){
	//fmt.Printf("index = %d",index)
	h := me.getRoot().config.PageSize.H
	me.stream.WriteString(fmt.Sprintf("q %0.2f 0 0 %0.2f %0.2f %0.2f cm /I%d Do Q\n", rect.W, rect.H , x , h - ( y + rect.H)  ,index+1))
}

//cal text height
func ContentObj_CalTextHeight(fontsize int) float64{
	return (float64(fontsize) *0.7)
}