draw2d

type FillRule int

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

type FontCache interface {
	// Loads a truetype font represented by the FontData object passed as
	// argument.
	// The method returns an error if the font could not be loaded, either
	// because it didn't exist or the resource it was loaded from was corrupted.
	Load(FontData) (*truetype.Font, error)

	// Sets the truetype font that will be returned by Load when given the font
	// data passed as first argument.
	Store(FontData, *truetype.Font)
}

type FontData struct {
	Name   string
	Family FontFamily
	Style  FontStyle
}

type FontFamily byte

type FontFileNamer func(fontData FontData) string

type FontMetrics struct {
	// Ascent is the distance from the baseline to the highest point
	// typically used by glyphs in the font
	Ascent float64

	// Descent is the distance from the baseline to the lowest point
	// typically used by glyphs (negative value)
	Descent float64

	// Height is the recommended line spacing (ascent - descent + linegap)
	Height float64

	// MaxAdvance is the maximum advance width for all glyphs
	MaxAdvance float64

	// UnderlinePosition is the position of the underline
	UnderlinePosition float64

	// UnderlineThickness is the thickness of the underline
	UnderlineThickness float64

	// CapHeight is the height of capital letters
	CapHeight float64

	// XHeight is the height of lowercase 'x'
	XHeight float64

	// LineGap is the recommended additional spacing between lines
	LineGap float64
}

type FontStyle byte

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

type GlyphMetrics struct {
	// Width is the horizontal distance from the origin to the point where
	// the next glyph should be drawn (advance width)
	Width float64

	// Height is the vertical distance from the origin to the point where
	// the next glyph should be drawn for vertical text (advance height)
	Height float64

	// XBearing is the horizontal distance from the origin to the leftmost
	// part of the glyph
	XBearing float64

	// YBearing is the vertical distance from the origin (baseline) to the
	// topmost part of the glyph
	YBearing float64

	// XAdvance is the horizontal distance to advance for the next glyph
	XAdvance float64

	// YAdvance is the vertical distance to advance for the next glyph
	YAdvance float64

	// BoundingBox contains the tight bounding box of the glyph outline
	BoundingBox struct {
		XMin, YMin float64
		XMax, YMax float64
	}

	// LSB is the left side bearing
	LSB float64

	// RSB is the right side bearing
	RSB float64
}

type GlyphTransform struct {
	// Matrix is the transformation matrix [xx, xy, yx, yy, x0, y0]
	Matrix Matrix

	// OffsetX is additional X offset
	OffsetX float64

	// OffsetY is additional Y offset
	OffsetY float64
}

type GraphicContext interface {
	// PathBuilder describes the interface for path drawing
	PathBuilder
	// BeginPath creates a new path
	BeginPath()
	// GetPath copies the current path, then returns it
	GetPath() Path
	// GetMatrixTransform returns the current transformation matrix
	GetMatrixTransform() Matrix
	// SetMatrixTransform sets the current transformation matrix
	SetMatrixTransform(tr Matrix)
	// ComposeMatrixTransform composes the current transformation matrix with tr
	ComposeMatrixTransform(tr Matrix)
	// Rotate applies a rotation to the current transformation matrix. angle is in radian.
	Rotate(angle float64)
	// Translate applies a translation to the current transformation matrix.
	Translate(tx, ty float64)
	// Scale applies a scale to the current transformation matrix.
	Scale(sx, sy float64)
	// SetStrokeColor sets the current stroke color
	SetStrokeColor(c color.Color)
	// SetFillColor sets the current fill color
	SetFillColor(c color.Color)
	// SetFillRule sets the current fill rule
	SetFillRule(f FillRule)
	// SetLineWidth sets the current line width
	SetLineWidth(lineWidth float64)
	// SetLineCap sets the current line cap
	SetLineCap(cap LineCap)
	// SetLineJoin sets the current line join
	SetLineJoin(join LineJoin)
	// SetLineDash sets the current dash
	SetLineDash(dash []float64, dashOffset float64)
	// SetFontSize sets the current font size
	SetFontSize(fontSize float64)
	// GetFontSize gets the current font size
	GetFontSize() float64
	// SetFontData sets the current FontData
	SetFontData(fontData FontData)
	// GetFontData gets the current FontData
	GetFontData() FontData
	// GetFontName gets the current FontData as a string
	GetFontName() string
	// DrawImage draws the raster image in the current canvas
	DrawImage(image image.Image)
	// Save the context and push it to the context stack
	Save()
	// Restore remove the current context and restore the last one
	Restore()
	// Clear fills the current canvas with a default transparent color
	Clear()
	// ClearRect fills the specified rectangle with a default transparent color
	ClearRect(x1, y1, x2, y2 int)
	// SetDPI sets the current DPI
	SetDPI(dpi int)
	// GetDPI gets the current DPI
	GetDPI() int
	// GetStringBounds gets pixel bounds(dimensions) of given string
	GetStringBounds(s string) (left, top, right, bottom float64)
	// CreateStringPath creates a path from the string s at x, y
	CreateStringPath(text string, x, y float64) (cursor float64)
	// FillString draws the text at point (0, 0)
	FillString(text string) (cursor float64)
	// FillStringAt draws the text at the specified point (x, y)
	FillStringAt(text string, x, y float64) (cursor float64)
	// StrokeString draws the contour of the text at point (0, 0)
	StrokeString(text string) (cursor float64)
	// StrokeStringAt draws the contour of the text at point (x, y)
	StrokeStringAt(text string, x, y float64) (cursor float64)
	// SetTextAlignment sets the vertical text alignment mode
	SetTextAlignment(alignment TextAlignment)
	// GetTextAlignment gets the current text alignment mode
	GetTextAlignment() TextAlignment
	// SetHintingMode sets the font hinting mode
	SetHintingMode(mode HintingMode)
	// GetHintingMode gets the current font hinting mode
	GetHintingMode() HintingMode
	// GetFontMetrics returns the current font metrics
	GetFontMetrics() FontMetrics
	// GetTextMetrics returns metrics for the given text string
	GetTextMetrics(text string) (*TextMetrics, error)
	// GetGlyphMetrics returns metrics for a specific rune
	GetGlyphMetrics(r rune) (*GlyphMetrics, error)
	// SetGlyphTransform sets the transformation matrix for individual glyphs
	SetGlyphTransform(transform GlyphTransform)
	// GetGlyphTransform gets the current glyph transformation
	GetGlyphTransform() GlyphTransform
	// ResetGlyphTransform resets the glyph transformation to identity
	ResetGlyphTransform()
	// Stroke strokes the paths with the color specified by SetStrokeColor
	Stroke(paths ...*Path)
	// Fill fills the paths with the color specified by SetFillColor
	Fill(paths ...*Path)
	// FillStroke first fills the paths and than strokes them
	FillStroke(paths ...*Path)
}

type Halign int

type HintingMode int

type ImageScaling struct {
	// Horizontal Alignment of the image
	Halign Halign
	// Vertical Alignment of the image
	Valign Valign
	// Width Height used by scaling policy
	Width, Height float64
	// ScalingPolicy defines the scaling policy to applied to the image
	ScalingPolicy ScalingPolicy
}

type LineCap int

type LineJoin int

type Matrix [6]float64

type Path struct {
	// Components is a slice of PathCmp in a Path and mark the role of each points in the Path
	Components []PathCmp
	// Points are combined with Components to have a specific role in the path
	Points []float64
	// contains filtered or unexported fields
}

type PathBuilder interface {
	// LastPoint returns the current point of the current sub path
	LastPoint() (x, y float64)
	// MoveTo creates a new subpath that start at the specified point
	MoveTo(x, y float64)
	// LineTo adds a line to the current subpath
	LineTo(x, y float64)
	// QuadCurveTo adds a quadratic Bézier curve to the current subpath
	QuadCurveTo(cx, cy, x, y float64)
	// CubicCurveTo adds a cubic Bézier curve to the current subpath
	CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64)
	// ArcTo adds an arc to the current subpath
	ArcTo(cx, cy, rx, ry, startAngle, angle float64)
	// Close creates a line from the current point to the last MoveTo
	// point (if not the same) and mark the path as closed so the
	// first and last lines join nicely.
	Close()
}

type PathCmp int

type ScalingPolicy int

type SolidFillStyle struct {
	// Color defines the line color
	Color color.Color
	// FillRule defines the file rule to used
	FillRule FillRule
}

type StrokeStyle struct {
	// Color defines the color of stroke
	Color color.Color
	// Line width
	Width float64
	// Line cap style rounded, butt or square
	LineCap LineCap
	// Line join style bevel, round or miter
	LineJoin LineJoin
	// offset of the first dash
	DashOffset float64
	// array represented dash length pair values are plain dash and impair are space between dash
	// if empty display plain line
	Dash []float64
}

type SyncFolderFontCache struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

type TextAlignment int

type TextMetrics struct {
	// XBearing is the horizontal distance from the origin to the leftmost
	// part of the text
	XBearing float64

	// YBearing is the vertical distance from the origin to the topmost
	// part of the text
	YBearing float64

	// Width is the width of the text bounding box
	Width float64

	// Height is the height of the text bounding box
	Height float64

	// XAdvance is the horizontal distance to advance after drawing the text
	XAdvance float64

	// YAdvance is the vertical distance to advance after drawing the text
	YAdvance float64
}

type TextStyle struct {
	// Color defines the color of text
	Color color.Color
	// Size font size
	Size float64
	// The font to use
	Font FontData
	// Horizontal Alignment of the text
	Halign Halign
	// Vertical Alignment of the text
	Valign Valign
}

type Valign int