draw2dbase

package
v0.0.0-...-ee6987b Latest Latest
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 Go to latest Published: Mar 22, 2024 License: BSD-2-Clause Imports: 8 Imported by: 38

README

draw2d/draw2dbase

Coverage GoDoc

Base package implementation that is used by pdf, svg, img, gl implementations.

Documentation

Index

Constants

View Source 
const (
	// CurveRecursionLimit represents the maximum recursion that is really necessary to subsivide a curve into straight lines
	CurveRecursionLimit = 32
)

Variables

View Source 
var DefaultFontData = draw2d.FontData{Name: "luxi", Family: draw2d.FontFamilySans, Style: draw2d.FontStyleNormal}

Functions

func Bresenham 

func Bresenham(img draw.Image, color color.Color, x0, y0, x1, y1 int)

Bresenham draws a line between (x0, y0) and (x1, y1)

func Flatten 

func Flatten(path *draw2d.Path, flattener Flattener, scale float64)

Flatten convert curves into straight segments keeping join segments info

func PolylineBresenham 

func PolylineBresenham(img draw.Image, c color.Color, s ...float64)

PolylineBresenham draws a polyline to an image

func SubdivideCubic 

func SubdivideCubic(c, c1, c2 []float64)

SubdivideCubic a Bezier cubic curve in 2 equivalents Bezier cubic curves. c1 and c2 parameters are the resulting curves length of c, c1 and c2 must be 8 otherwise it panics.

func SubdivideQuad 

func SubdivideQuad(c, c1, c2 []float64)

SubdivideQuad a Bezier quad curve in 2 equivalents Bezier quad curves. c1 and c2 parameters are the resulting curves length of c, c1 and c2 must be 6 otherwise it panics.

func TraceArc 

func TraceArc(t Liner, x, y, rx, ry, start, angle, scale float64) (lastX, lastY float64)

TraceArc trace an arc using a Liner

func TraceCubic 

func TraceCubic(t Liner, cubic []float64, flatteningThreshold float64) error

TraceCubic generate lines subdividing the cubic curve using a Liner flattening_threshold helps determines the flattening expectation of the curve

func TraceQuad 

func TraceQuad(t Liner, quad []float64, flatteningThreshold float64) error

TraceQuad generate lines subdividing the curve using a Liner flattening_threshold helps determines the flattening expectation of the curve

Types

type ContextStack 

type ContextStack struct {
	Tr          draw2d.Matrix
	Path        *draw2d.Path
	LineWidth   float64
	Dash        []float64
	DashOffset  float64
	StrokeColor color.Color
	FillColor   color.Color
	FillRule    draw2d.FillRule
	Cap         draw2d.LineCap
	Join        draw2d.LineJoin
	FontSize    float64
	FontData    draw2d.FontData

	Font *truetype.Font
	// fontSize and dpi are used to calculate scale. scale is the number of
	// 26.6 fixed point units in 1 em.
	Scale float64

	Previous *ContextStack
}

func (*ContextStack) GetFontName 

func (cs *ContextStack) GetFontName() string

GetFontName gets the current FontData with fontSize as a string

type DashVertexConverter 

type DashVertexConverter struct {
	// contains filtered or unexported fields
}

func NewDashConverter 

func NewDashConverter(dash []float64, dashOffset float64, flattener Flattener) *DashVertexConverter

func (*DashVertexConverter) Close 

func (dasher *DashVertexConverter) Close()

func (*DashVertexConverter) End 

func (dasher *DashVertexConverter) End()

func (*DashVertexConverter) LineJoin 

func (dasher *DashVertexConverter) LineJoin()

func (*DashVertexConverter) LineTo 

func (dasher *DashVertexConverter) LineTo(x, y float64)

func (*DashVertexConverter) MoveTo 

func (dasher *DashVertexConverter) MoveTo(x, y float64)

type DemuxFlattener 

type DemuxFlattener struct {
	Flatteners []Flattener
}

func (DemuxFlattener) Close 

func (dc DemuxFlattener) Close()

func (DemuxFlattener) End 

func (dc DemuxFlattener) End()

func (DemuxFlattener) LineJoin 

func (dc DemuxFlattener) LineJoin()

func (DemuxFlattener) LineTo 

func (dc DemuxFlattener) LineTo(x, y float64)

func (DemuxFlattener) MoveTo 

func (dc DemuxFlattener) MoveTo(x, y float64)

type Flattener 

type Flattener interface {
	// MoveTo Start a New line from the point (x, y)
	MoveTo(x, y float64)
	// LineTo Draw a line from the current position to the point (x, y)
	LineTo(x, y float64)
	// LineJoin use Round, Bevel or miter to join points
	LineJoin()
	// Close add the most recent starting point to close the path to create a polygon
	Close()
	// End mark the current line as finished so we can draw caps
	End()
}

Flattener receive segment definition

type Glyph 

type Glyph struct {
	// path represents a glyph, it is always at (0, 0)
	Path *draw2d.Path
	// Width of the glyph
	Width float64
}

Glyph represents a rune which has been converted to a Path and width

func (*Glyph) Copy 

func (g *Glyph) Copy() *Glyph

Copy Returns a copy of a Glyph

func (*Glyph) Fill 

func (g *Glyph) Fill(gc draw2d.GraphicContext, x, y float64) float64

Fill copies a glyph from the cache, and fills it

func (*Glyph) Stroke 

func (g *Glyph) Stroke(gc draw2d.GraphicContext, x, y float64) float64

Stroke fetches a glyph from the cache, and strokes it

type GlyphCache 

type GlyphCache interface {
	// Fetch fetches a glyph from the cache, storing with Render first if it doesn't already exist
	Fetch(gc draw2d.GraphicContext, fontName string, chr rune) *Glyph
}

GlyphCache manage a cache of glyphs

type GlyphCacheImp 

type GlyphCacheImp struct {
	// contains filtered or unexported fields
}

GlyphCacheImp manage a map of glyphs without sync mecanism, not thread safe

func NewGlyphCache 

func NewGlyphCache() *GlyphCacheImp

NewGlyphCache initializes a GlyphCache

func (*GlyphCacheImp) Fetch 

func (glyphCache *GlyphCacheImp) Fetch(gc draw2d.GraphicContext, fontName string, chr rune) *Glyph

Fetch fetches a glyph from the cache, calling renderGlyph first if it doesn't already exist

type LineStroker 

type LineStroker struct {
	Flattener     Flattener
	HalfLineWidth float64
	Cap           draw2d.LineCap
	Join          draw2d.LineJoin
	// contains filtered or unexported fields
}

func NewLineStroker 

func NewLineStroker(c draw2d.LineCap, j draw2d.LineJoin, flattener Flattener) *LineStroker

func (*LineStroker) Close 

func (l *LineStroker) Close()

func (*LineStroker) End 

func (l *LineStroker) End()

func (*LineStroker) LineJoin 

func (l *LineStroker) LineJoin()

func (*LineStroker) LineTo 

func (l *LineStroker) LineTo(x, y float64)

func (*LineStroker) MoveTo 

func (l *LineStroker) MoveTo(x, y float64)

type Liner 

type Liner interface {
	// LineTo Draw a line from the current position to the point (x, y)
	LineTo(x, y float64)
}

Liner receive segment definition

type SegmentedPath 

type SegmentedPath struct {
	Points []float64
}

func (*SegmentedPath) Close 

func (p *SegmentedPath) Close()

func (*SegmentedPath) End 

func (p *SegmentedPath) End()

func (*SegmentedPath) LineJoin 

func (p *SegmentedPath) LineJoin()

func (*SegmentedPath) LineTo 

func (p *SegmentedPath) LineTo(x, y float64)

func (*SegmentedPath) MoveTo 

func (p *SegmentedPath) MoveTo(x, y float64)

type StackGraphicContext 

type StackGraphicContext struct {
	Current *ContextStack
}

func NewStackGraphicContext 

func NewStackGraphicContext() *StackGraphicContext

*

  • Create a new Graphic context from an image

func (*StackGraphicContext) ArcTo 

func (gc *StackGraphicContext) ArcTo(cx, cy, rx, ry, startAngle, angle float64)

func (*StackGraphicContext) BeginPath 

func (gc *StackGraphicContext) BeginPath()

func (*StackGraphicContext) Close 

func (gc *StackGraphicContext) Close()

func (*StackGraphicContext) ComposeMatrixTransform 

func (gc *StackGraphicContext) ComposeMatrixTransform(Tr draw2d.Matrix)

func (*StackGraphicContext) CubicCurveTo 

func (gc *StackGraphicContext) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64)

func (*StackGraphicContext) GetFontData 

func (gc *StackGraphicContext) GetFontData() draw2d.FontData

func (*StackGraphicContext) GetFontName 

func (gc *StackGraphicContext) GetFontName() string

func (*StackGraphicContext) GetFontSize 

func (gc *StackGraphicContext) GetFontSize() float64

func (*StackGraphicContext) GetMatrixTransform 

func (gc *StackGraphicContext) GetMatrixTransform() draw2d.Matrix

func (*StackGraphicContext) GetPath 

func (gc *StackGraphicContext) GetPath() draw2d.Path

func (*StackGraphicContext) IsEmpty 

func (gc *StackGraphicContext) IsEmpty() bool

func (*StackGraphicContext) LastPoint 

func (gc *StackGraphicContext) LastPoint() (float64, float64)

func (*StackGraphicContext) LineTo 

func (gc *StackGraphicContext) LineTo(x, y float64)

func (*StackGraphicContext) MoveTo 

func (gc *StackGraphicContext) MoveTo(x, y float64)

func (*StackGraphicContext) QuadCurveTo 

func (gc *StackGraphicContext) QuadCurveTo(cx, cy, x, y float64)

func (*StackGraphicContext) Restore 

func (gc *StackGraphicContext) Restore()

func (*StackGraphicContext) Rotate 

func (gc *StackGraphicContext) Rotate(angle float64)

func (*StackGraphicContext) Save 

func (gc *StackGraphicContext) Save()

func (*StackGraphicContext) Scale 

func (gc *StackGraphicContext) Scale(sx, sy float64)

func (*StackGraphicContext) SetFillColor 

func (gc *StackGraphicContext) SetFillColor(c color.Color)

func (*StackGraphicContext) SetFillRule 

func (gc *StackGraphicContext) SetFillRule(f draw2d.FillRule)

func (*StackGraphicContext) SetFontData 

func (gc *StackGraphicContext) SetFontData(fontData draw2d.FontData)

func (*StackGraphicContext) SetFontSize 

func (gc *StackGraphicContext) SetFontSize(fontSize float64)

func (*StackGraphicContext) SetLineCap 

func (gc *StackGraphicContext) SetLineCap(cap draw2d.LineCap)

func (*StackGraphicContext) SetLineDash 

func (gc *StackGraphicContext) SetLineDash(dash []float64, dashOffset float64)

func (*StackGraphicContext) SetLineJoin 

func (gc *StackGraphicContext) SetLineJoin(join draw2d.LineJoin)

func (*StackGraphicContext) SetLineWidth 

func (gc *StackGraphicContext) SetLineWidth(lineWidth float64)

func (*StackGraphicContext) SetMatrixTransform 

func (gc *StackGraphicContext) SetMatrixTransform(Tr draw2d.Matrix)

func (*StackGraphicContext) SetStrokeColor 

func (gc *StackGraphicContext) SetStrokeColor(c color.Color)

func (*StackGraphicContext) Translate 

func (gc *StackGraphicContext) Translate(tx, ty float64)

type Transformer 

type Transformer struct {
	Tr        draw2d.Matrix
	Flattener Flattener
}

Transformer apply the Matrix transformation tr

func (Transformer) Close 

func (t Transformer) Close()

func (Transformer) End 

func (t Transformer) End()

func (Transformer) LineJoin 

func (t Transformer) LineJoin()

func (Transformer) LineTo 

func (t Transformer) LineTo(x, y float64)

func (Transformer) MoveTo 

func (t Transformer) MoveTo(x, y float64)

Source Files

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