use pdf native transforms
This commit is contained in:
Stani
parent
458c46b28c
commit
b3bea4f206
3 changed files with 65 additions and 70 deletions
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@ -10,6 +10,7 @@ import (
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"image/color"
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"image/png"
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"log"
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"math"
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"os"
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"strconv"
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@ -79,18 +80,15 @@ func NewGraphicContext(pdf *gofpdf.Fpdf) *GraphicContext {
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// DrawImage draws an image as PNG
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// TODO: add type (tp) as parameter to argument list?
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func (gc *GraphicContext) DrawImage(image image.Image) {
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// TODO: fix rotation gc.Current.Tr
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name := strconv.Itoa(int(imageCount))
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tp := "PNG" // "JPG", "JPEG", "PNG" and "GIF"
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b := &bytes.Buffer{}
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png.Encode(b, image)
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gc.pdf.RegisterImageReader(name, tp, b)
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bounds := image.Bounds()
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//x0, y0, x1, y1 := float64(bounds.Min.X), float64(bounds.Min.Y), float64(bounds.Dx()), float64(bounds.Dy())
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x0, y0, x1, y1 := float64(bounds.Min.X), float64(bounds.Min.Y), float64(bounds.Max.X), float64(bounds.Max.Y)
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tr := gc.Current.Tr
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tr.TransformRectangle(&x0, &y0, &x1, &y1)
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gc.pdf.Image(name, x0, y0, x1-x0, y1-y0, false, tp, 0, "")
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x0, y0 := float64(bounds.Min.X), float64(bounds.Min.Y)
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w, h := float64(bounds.Dx()), float64(bounds.Dy())
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gc.pdf.Image(name, x0, y0, w, h, false, tp, 0, "")
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}
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// Clear draws a white rectangle over the whole page
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@ -123,13 +121,9 @@ func (gc *GraphicContext) GetStringBounds(s string) (left, top, right, bottom fl
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// CreateStringPath creates a path from the string s at x, y, and returns the string width.
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func (gc *GraphicContext) CreateStringPath(text string, x, y float64) (cursor float64) {
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// TODO: fix rotation of gc.Current.Tr
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_, _, w, h := gc.GetStringBounds(text)
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x1, y1 := x+w, y+h
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tr := gc.Current.Tr
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tr.TransformRectangle(&x, &y, &x1, &y1)
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gc.pdf.MoveTo(x, y)
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gc.pdf.Cell(x1-x, y1-y, text)
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gc.pdf.Cell(w, h, text)
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return w
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}
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@ -175,8 +169,8 @@ var logger = log.New(os.Stdout, "", log.Lshortfile)
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// draw fills and/or strokes paths
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func (gc *GraphicContext) draw(style string, paths ...*draw2d.PathStorage) {
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paths = append(paths, gc.Current.Path)
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pathConverter := NewPathConverter(NewVertexMatrixTransform(gc.Current.Tr, gc.pdf))
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// pathConverter := NewPathConverter(NewVertexMatrixTransform(gc.Current.Tr,NewPathLogger(logger, gc.pdf)))
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pathConverter := NewPathConverter(gc.pdf)
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// pathConverter := NewPathConverter(NewPathLogger(logger, gc.pdf))
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pathConverter.Convert(paths...)
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if gc.Current.FillRule.UseNonZeroWinding() {
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style += "*"
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@ -245,3 +239,59 @@ func (gc *GraphicContext) SetLineCap(Cap draw2d.Cap) {
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gc.StackGraphicContext.SetLineCap(Cap)
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gc.pdf.SetLineCapStyle(caps[Cap])
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}
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// Transformations
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// Scale generally scales the following text, drawings and images.
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// sx and sy are the scaling factors for width and height.
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// This must be placed between gc.Save() and gc.Restore(), otherwise
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// the pdf is invalid.
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func (gc *GraphicContext) Scale(sx, sy float64) {
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gc.StackGraphicContext.Scale(sx, sy)
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gc.pdf.TransformScale(sx*100, sy*100, 0, 0)
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}
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// Rotate rotates the following text, drawings and images.
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// Angle is specified in radians and measured clockwise from the
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// 3 o'clock position.
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// This must be placed between gc.Save() and gc.Restore(), otherwise
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// the pdf is invalid.
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func (gc *GraphicContext) Rotate(angle float64) {
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gc.StackGraphicContext.Rotate(angle)
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gc.pdf.TransformRotate(-angle*180/math.Pi, 0, 0)
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}
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// Translate moves the following text, drawings and images
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// horizontally and vertically by the amounts specified by tx and ty.
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// This must be placed between gc.Save() and gc.Restore(), otherwise
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// the pdf is invalid.
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func (gc *GraphicContext) Translate(tx, ty float64) {
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gc.StackGraphicContext.Translate(tx, ty)
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gc.pdf.TransformTranslate(tx, ty)
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}
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// Save saves the current context stack
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// (transformation, font, color,...).
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func (gc *GraphicContext) Save() {
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gc.StackGraphicContext.Save()
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gc.pdf.TransformBegin()
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}
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// Restore restores the current context stack
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// (transformation, color,...). Restoring the font is not supported.
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func (gc *GraphicContext) Restore() {
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gc.pdf.TransformEnd()
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gc.StackGraphicContext.Restore()
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c := gc.Current
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gc.SetFontSize(c.FontSize)
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// gc.SetFontData(c.FontData) unsupported, causes bug (do not enable)
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gc.SetLineWidth(c.LineWidth)
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gc.SetStrokeColor(c.StrokeColor)
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gc.SetFillColor(c.FillColor)
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gc.SetFillRule(c.FillRule)
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// gc.SetLineDash(c.Dash, c.DashOffset) // TODO
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gc.SetLineCap(c.Cap)
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// gc.SetLineJoin(c.Join) // TODO
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// c.Path unsupported
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// c.Font unsupported
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}
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@ -37,10 +37,12 @@ func main() {
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// Draw image to fit in the frame
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// TODO Seems to have a transform bug here on draw image
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scale := math.Min((dw-margin*2)/sw, (dh-margin*2)/sh)
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gc.Save()
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gc.Translate(margin, margin)
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gc.Scale(scale, scale)
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gc.DrawImage(source)
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gc.Restore()
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// Save to pdf
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pdf2d.SaveToPdfFile("frame-image.pdf", dest)
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@ -1,57 +0,0 @@
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// Copyright 2015 The draw2d Authors. All rights reserved.
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// created: 26/06/2015 by Stani Michiels
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package pdf2d
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import "github.com/stanim/draw2d"
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// VertexMatrixTransform implements Vectorizer and applies the Matrix
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// transformation tr. It is normally wrapped around gofpdf Fpdf
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// or PathLogger.
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type VertexMatrixTransform struct {
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tr draw2d.MatrixTransform
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Next Vectorizer
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}
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// NewVertexMatrixTransform constructs an new VertexMatrixTransform
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func NewVertexMatrixTransform(tr draw2d.MatrixTransform,
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vectorizer Vectorizer) *VertexMatrixTransform {
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return &VertexMatrixTransform{tr, vectorizer}
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}
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// MoveTo creates a new subpath that start at the specified point
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func (vmt *VertexMatrixTransform) MoveTo(x, y float64) {
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vmt.tr.Transform(&x, &y)
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vmt.Next.MoveTo(x, y)
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}
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// LineTo adds a line to the current subpath
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func (vmt *VertexMatrixTransform) LineTo(x, y float64) {
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vmt.tr.Transform(&x, &y)
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vmt.Next.LineTo(x, y)
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}
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// CurveTo adds a quadratic bezier curve to the current subpath
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func (vmt *VertexMatrixTransform) CurveTo(cx, cy, x, y float64) {
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vmt.tr.Transform(&cx, &cy, &x, &y)
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vmt.Next.CurveTo(cx, cy, x, y)
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}
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// CurveBezierCubicTo adds a cubic bezier curve to the current subpath
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func (vmt *VertexMatrixTransform) CurveBezierCubicTo(cx1, cy1,
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cx2, cy2, x, y float64) {
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vmt.tr.Transform(&cx1, &cy1, &cx2, &cy2, &x, &y)
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vmt.Next.CurveBezierCubicTo(cx1, cy1, cx2, cy2, x, y)
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}
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// ArcTo adds an arc to the current subpath
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func (vmt *VertexMatrixTransform) ArcTo(x, y, rx, ry, degRotate, degStart, degEnd float64) {
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vmt.tr.Transform(&x, &y)
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vmt.Next.ArcTo(x, y, rx, ry, degRotate, degStart, degEnd)
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}
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// ClosePath closes the subpath
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func (vmt *VertexMatrixTransform) ClosePath() {
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vmt.Next.ClosePath()
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}
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