mirror of
https://github.com/unidoc/unipdf.git
synced 2025-04-26 13:48:55 +08:00
113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
/*
|
|
* This file is subject to the terms and conditions defined in
|
|
* file 'LICENSE.md', which is part of this source code package.
|
|
*/
|
|
|
|
package creator
|
|
|
|
import (
|
|
pdfcontent "github.com/unidoc/unipdf/v3/contentstream"
|
|
"github.com/unidoc/unipdf/v3/contentstream/draw"
|
|
pdfcore "github.com/unidoc/unipdf/v3/core"
|
|
pdf "github.com/unidoc/unipdf/v3/model"
|
|
)
|
|
|
|
// FilledCurve represents a closed path of Bezier curves with a border and fill.
|
|
type FilledCurve struct {
|
|
curves []draw.CubicBezierCurve
|
|
FillEnabled bool // Show fill?
|
|
fillColor *pdf.PdfColorDeviceRGB
|
|
BorderEnabled bool // Show border?
|
|
BorderWidth float64
|
|
borderColor *pdf.PdfColorDeviceRGB
|
|
}
|
|
|
|
// newFilledCurve returns a instance of filled curve.
|
|
func newFilledCurve() *FilledCurve {
|
|
curve := FilledCurve{}
|
|
curve.curves = []draw.CubicBezierCurve{}
|
|
return &curve
|
|
}
|
|
|
|
// AppendCurve appends a Bezier curve to the filled curve.
|
|
func (fc *FilledCurve) AppendCurve(curve draw.CubicBezierCurve) *FilledCurve {
|
|
fc.curves = append(fc.curves, curve)
|
|
return fc
|
|
}
|
|
|
|
// SetFillColor sets the fill color for the path.
|
|
func (fc *FilledCurve) SetFillColor(color Color) {
|
|
fc.fillColor = pdf.NewPdfColorDeviceRGB(color.ToRGB())
|
|
}
|
|
|
|
// SetBorderColor sets the border color for the path.
|
|
func (fc *FilledCurve) SetBorderColor(color Color) {
|
|
fc.borderColor = pdf.NewPdfColorDeviceRGB(color.ToRGB())
|
|
}
|
|
|
|
// draw draws the filled curve. Can specify a graphics state (gsName) for setting opacity etc. Otherwise leave empty ("").
|
|
// Returns the content stream as a byte array, the bounding box and an error on failure.
|
|
func (fc *FilledCurve) draw(gsName string) ([]byte, *pdf.PdfRectangle, error) {
|
|
bpath := draw.NewCubicBezierPath()
|
|
for _, c := range fc.curves {
|
|
bpath = bpath.AppendCurve(c)
|
|
}
|
|
|
|
creator := pdfcontent.NewContentCreator()
|
|
creator.Add_q()
|
|
|
|
if fc.FillEnabled {
|
|
creator.Add_rg(fc.fillColor.R(), fc.fillColor.G(), fc.fillColor.B())
|
|
}
|
|
if fc.BorderEnabled {
|
|
creator.Add_RG(fc.borderColor.R(), fc.borderColor.G(), fc.borderColor.B())
|
|
creator.Add_w(fc.BorderWidth)
|
|
}
|
|
if len(gsName) > 1 {
|
|
// If a graphics state is provided, use it. (can support transparency).
|
|
creator.Add_gs(pdfcore.PdfObjectName(gsName))
|
|
}
|
|
|
|
draw.DrawBezierPathWithCreator(bpath, creator)
|
|
creator.Add_h() // Close the path.
|
|
|
|
if fc.FillEnabled && fc.BorderEnabled {
|
|
creator.Add_B() // fill and stroke.
|
|
} else if fc.FillEnabled {
|
|
creator.Add_f() // Fill.
|
|
} else if fc.BorderEnabled {
|
|
creator.Add_S() // Stroke.
|
|
}
|
|
creator.Add_Q()
|
|
|
|
// Get bounding box.
|
|
pathBbox := bpath.GetBoundingBox()
|
|
if fc.BorderEnabled {
|
|
// Account for stroke width.
|
|
pathBbox.Height += fc.BorderWidth
|
|
pathBbox.Width += fc.BorderWidth
|
|
pathBbox.X -= fc.BorderWidth / 2
|
|
pathBbox.Y -= fc.BorderWidth / 2
|
|
}
|
|
|
|
// Bounding box - global coordinate system.
|
|
bbox := &pdf.PdfRectangle{}
|
|
bbox.Llx = pathBbox.X
|
|
bbox.Lly = pathBbox.Y
|
|
bbox.Urx = pathBbox.X + pathBbox.Width
|
|
bbox.Ury = pathBbox.Y + pathBbox.Height
|
|
return creator.Bytes(), bbox, nil
|
|
}
|
|
|
|
// GeneratePageBlocks draws the filled curve on page blocks.
|
|
func (fc *FilledCurve) GeneratePageBlocks(ctx DrawContext) ([]*Block, DrawContext, error) {
|
|
block := NewBlock(ctx.PageWidth, ctx.PageHeight)
|
|
|
|
contents, _, err := fc.draw("")
|
|
err = block.addContentsByString(string(contents))
|
|
if err != nil {
|
|
return nil, ctx, err
|
|
}
|
|
return []*Block{block}, ctx, nil
|
|
}
|