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Sample Swift code for using PDFTron SDK to create various patterns and shadings in PDF files. Learn more about our Swift PDF Library and PDF Editing & Manipulation Library.
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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
import PDFNet
import Foundation
func CreateTilingPattern(doc: PTPDFDoc) -> PTObj {
let writer: PTElementWriter = PTElementWriter()
let eb: PTElementBuilder = PTElementBuilder()
// Create a new pattern content stream - a heart. ------------
writer.writerBegin(with: doc.getSDFDoc(), compress: true)
eb.pathBegin()
eb.move(to: 0, y: 0)
eb.curve(to: 500, cy1: 500, cx2: 125, cy2: 625, x2: 0, y2: 500)
eb.curve(to: -125, cy1: 625, cx2: -500, cy2: 500, x2: 0, y2: 0)
let heart: PTElement = eb.pathEnd()
heart.setPathFill(true)
// Set heart color to red.
heart.getGState().setFill(PTColorSpace.createDeviceRGB())
heart.getGState().setFillColor(with: PTColorPt(x: 1, y: 0, z: 0, w: 0))
writer.write(heart)
let pattern_dict: PTObj = writer.end()
// Initialize pattern dictionary. For details on what each parameter represents please
// refer to Table 4.22 (Section '4.6.2 Tiling Patterns') in PDF Reference Manual.
pattern_dict.putName("Type", name: "Pattern")
pattern_dict.putNumber("PatternType", value: 1)
// TilingType - Constant spacing.
pattern_dict.putNumber("TilingType", value: 1)
// This is a Type1 pattern - A colored tiling pattern.
pattern_dict.putNumber("PaintType", value: 1)
// Set bounding box
pattern_dict.putRect("BBox", x1: -253, y1: 0, x2: 253, y2: 545)
// Create and set the matrix
let pattern_mtx: PTMatrix2D = PTMatrix2D(a: 0.04, b: 0, c: 0, d: 0.04, h: 0, v: 0)
pattern_dict.putMatrix("Matrix", value: pattern_mtx)
// Set the desired horizontal and vertical spacing between pattern cells,
// measured in the pattern coordinate system.
pattern_dict.putNumber("XStep", value: 1000)
pattern_dict.putNumber("YStep", value: 1000)
return pattern_dict // finished creating the Pattern resource
}
func CreateImageTilingPattern(doc: PTPDFDoc) -> PTObj {
let writer: PTElementWriter = PTElementWriter()
let eb: PTElementBuilder = PTElementBuilder()
// Create a new pattern content stream - a single bitmap object ----------
writer.writerBegin(with: doc.getSDFDoc(), compress: true)
let image: PTImage = PTImage.create(doc.getSDFDoc(), filename: Bundle.main.path(forResource: "dice", ofType: "jpg"))
let img_element: PTElement = eb.createImage(withCornerAndScale: image, x: 0, y: 0, hscale: Double(image.getWidth()), vscale: Double(image.getHeight()))
writer.writePlacedElement(img_element)
let pattern_dict: PTObj = writer.end()
// Initialize pattern dictionary. For details on what each parameter represents please
// refer to Table 4.22 (Section '4.6.2 Tiling Patterns') in PDF Reference Manual.
pattern_dict.putName("Type", name: "Pattern")
pattern_dict.putNumber("PatternType", value: 1)
// TilingType - Constant spacing.
pattern_dict.putNumber("TilingType", value: 1)
// This is a Type1 pattern - A colored tiling pattern.
pattern_dict.putNumber("PaintType", value: 1)
// Set bounding box
pattern_dict.putRect("BBox", x1: -253, y1: 0, x2: 253, y2: 545)
// Create and set the matrix
let pattern_mtx = PTMatrix2D(a: 0.3, b: 0, c: 0, d: 0.3, h: 0, v: 0)
pattern_dict.putMatrix("Matrix", value: pattern_mtx)
// Set the desired horizontal and vertical spacing between pattern cells,
// measured in the pattern coordinate system.
pattern_dict.putNumber("XStep", value: 300)
pattern_dict.putNumber("YStep", value: 300)
return pattern_dict // finished creating the Pattern resource
}
func CreateAxialShading(doc: PTPDFDoc) -> PTObj {
// Create a new Shading object ------------
let pattern_dict: PTObj = doc.createIndirectDict()
// Initialize pattern dictionary. For details on what each parameter represents
// please refer to Tables 4.30 and 4.26 in PDF Reference Manual
pattern_dict.putName("Type", name: "Pattern")
pattern_dict.putNumber("PatternType", value: 2)
// 2 stands for shading
let shadingDict: PTObj = pattern_dict.putDict("Shading")
shadingDict.putNumber("ShadingType", value: 2)
shadingDict.putName("ColorSpace", name: "DeviceCMYK")
// pass the coordinates of the axial shading to the output
let shadingCoords: PTObj = shadingDict.putArray("Coords")
shadingCoords.pushBackNumber(0)
shadingCoords.pushBackNumber(0)
shadingCoords.pushBackNumber(612)
shadingCoords.pushBackNumber(794)
// pass the function to the axial shading
let function: PTObj = shadingDict.putDict("Function")
let C0: PTObj = function.putArray("C0")
C0.pushBackNumber(1)
C0.pushBackNumber(0)
C0.pushBackNumber(0)
C0.pushBackNumber(0)
let C1: PTObj = function.putArray("C1")
C1.pushBackNumber(0)
C1.pushBackNumber(1)
C1.pushBackNumber(0)
C1.pushBackNumber(0)
let domain: PTObj = function.putArray("Domain")
domain.pushBackNumber(0)
domain.pushBackNumber(1)
function.putNumber("FunctionType", value: 2)
function.putNumber("N", value: 1)
return pattern_dict
}
func runPatternTest() -> Int {
return autoreleasepool {
var ret = 0
do {
try PTPDFNet.catchException {
let doc: PTPDFDoc = PTPDFDoc()
let writer: PTElementWriter = PTElementWriter()
let eb: PTElementBuilder = PTElementBuilder()
// The following sample illustrates how to create and use tiling patterns
var page: PTPage = doc.pageCreate(PTPDFRect(x1: 0, y1: 0, x2: 612, y2: 792))
writer.begin(page, placement: e_ptoverlay, page_coord_sys: true, compress:true)
var element: PTElement = eb.createTextBegin(with: PTFont.create(doc.getSDFDoc(), type: e_pttimes_bold, embed: false), font_sz: 1)
writer.write(element) // Begin the text block
element = eb.createTextRun("G")
element.setTextMatrix(720, b: 0, c: 0, d: 720, h: 20, v: 240)
var gs: PTGState = element.getGState()
gs.setTextRenderMode(e_ptfill_stroke_text)
gs.setLineWidth(4)
// Set the fill color space to the Pattern color space.
gs.setFill(PTColorSpace.createPattern())
gs.setFillColor(withPattern: PTPatternColor(pattern: CreateTilingPattern(doc: doc)))
writer.write(element)
writer.write(eb.createTextEnd()) // Finish the text block
writer.end() // Save the page
doc.pagePushBack(page)
//-----------------------------------------------
/// The following sample illustrates how to create and use image tiling pattern
page = doc.pageCreate(PTPDFRect(x1: 0, y1: 0, x2: 612, y2: 792))
writer.begin(page, placement: e_ptoverlay, page_coord_sys: true, compress: true)
eb.reset(PTGState())
element = eb.createRect(0, y: 0, width: 612, height: 794)
// Set the fill color space to the Pattern color space.
gs = element.getGState()
gs.setFill(PTColorSpace.createPattern())
gs.setFillColor(withPattern: PTPatternColor(pattern: CreateImageTilingPattern(doc: doc)))
element.setPathFill(true)
writer.write(element)
writer.end() // Save the page
doc.pagePushBack(page)
//-----------------------------------------------
/// The following sample illustrates how to create and use PDF shadings
page = doc.pageCreate(PTPDFRect(x1: 0, y1: 0, x2: 612, y2: 792))
writer.begin(page, placement: e_ptoverlay, page_coord_sys: true, compress: true)
eb.reset(PTGState())
element = eb.createRect(0, y: 0, width: 612, height: 794)
// Set the fill color space to the Pattern color space.
gs = element.getGState()
gs.setFill(PTColorSpace.createPattern())
gs.setFillColor(withPattern: PTPatternColor(pattern: CreateAxialShading(doc: doc)))
element.setPathFill(true)
writer.write(element)
writer.end() // Save the page
doc.pagePushBack(page)
//-----------------------------------------------
doc.save(toFile: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("patterns.pdf").path, flags: e_ptremove_unused.rawValue)
print("Done. Result saved in patterns.pdf...")
}
} catch let e as NSError {
print("\(e)")
ret = 1
}
return ret
}
}