cairo

package
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 Go to latest Published: Mar 16, 2023 License: MPL-2.0 Imports: 12 Imported by: 30

Documentation

Overview

Package cairo implements Go bindings for Cairo. Supports version 1.10 and later.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func FormatStrideForWidth 

func FormatStrideForWidth(format Format, width int) int

FormatStrideForWidth is a wrapper for cairo_format_stride_for_width().

Types

type Antialias 

type Antialias int

Antialias is a representation of Cairo's cairo_antialias_t. 

const (
	AntialiasDefault  Antialias = C.CAIRO_ANTIALIAS_DEFAULT
	AntialiasNone     Antialias = C.CAIRO_ANTIALIAS_NONE
	AntialiasGray     Antialias = C.CAIRO_ANTIALIAS_GRAY
	AntialiasSubpixel Antialias = C.CAIRO_ANTIALIAS_SUBPIXEL
	AntialiasFast     Antialias = C.CAIRO_ANTIALIAS_FAST // (since 1.12)
	AntialiasGood     Antialias = C.CAIRO_ANTIALIAS_GOOD // (since 1.12)
	AntialiasBest     Antialias = C.CAIRO_ANTIALIAS_BEST // (since 1.12)
)

type Content 

type Content int

Content is a representation of Cairo's cairo_content_t. 

const (
	ContentColor      Content = C.CAIRO_CONTENT_COLOR
	ContentAlpha      Content = C.CAIRO_CONTENT_ALPHA
	ContentColorAlpha Content = C.CAIRO_CONTENT_COLOR_ALPHA
)

type Context 

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

Context is a representation of Cairo's cairo_t.

func Create 

func Create(target *Surface) *Context

Create is a wrapper around cairo_create().

func WrapContext 

func WrapContext(p uintptr) *Context

func (*Context) Antialias 

func (v *Context) Antialias() Antialias

GetAntialias is a wrapper around cairo_get_antialias().

func (*Context) Arc 

func (v *Context) Arc(xc, yc, radius, angle1, angle2 float64)

Arc is a wrapper around cairo_arc().

func (*Context) ArcNegative 

func (v *Context) ArcNegative(xc, yc, radius, angle1, angle2 float64)

ArcNegative is a wrapper around cairo_arc_negative().

func (*Context) Clip 

func (v *Context) Clip()

Clip is a wrapper around cairo_clip().

func (*Context) ClipExtents 

func (v *Context) ClipExtents() (x1, y1, x2, y2 float64)

ClipExtents is a wrapper around cairo_clip_extents().

func (*Context) ClipPreserve 

func (v *Context) ClipPreserve()

ClipPreserve is a wrapper around cairo_clip_preserve().

func (*Context) Close 

func (v *Context) Close()

Closes the context. The context must not be used afterwards.

func (*Context) ClosePath 

func (v *Context) ClosePath()

ClosePath is a wrapper around cairo_close_path().

func (*Context) CopyPage 

func (v *Context) CopyPage()

CopyPage is a wrapper around cairo_copy_page().

func (*Context) CurrentPoint 

func (v *Context) CurrentPoint() (x, y float64)

GetCurrentPoint is a wrapper around cairo_get_current_point().

func (*Context) CurveTo 

func (v *Context) CurveTo(x1, y1, x2, y2, x3, y3 float64)

CurveTo is a wrapper around cairo_curve_to().

func (*Context) Dash 

func (v *Context) Dash() (dashes []float64, offset float64)

GetDash is a wrapper around cairo_get_dash().

func (*Context) DashCount 

func (v *Context) DashCount() int

GetDashCount is a wrapper around cairo_get_dash_count().

func (*Context) DeviceToUser 

func (v *Context) DeviceToUser(x, y float64) (float64, float64)

DeviceToUser is a wrapper around cairo_device_to_user.

func (*Context) DeviceToUserDistance 

func (v *Context) DeviceToUserDistance(x, y float64) (float64, float64)

DeviceToUserDistance is a wrapper around cairo_device_to_user_distance.

func (*Context) Fill 

func (v *Context) Fill()

Fill is a wrapper around cairo_fill().

func (*Context) FillExtents 

func (v *Context) FillExtents() (x1, y1, x2, y2 float64)

FillExtents is a wrapper around cairo_fill_extents().

func (*Context) FillPreserve 

func (v *Context) FillPreserve()

FillPreserve is a wrapper around cairo_fill_preserve().

func (*Context) FillRule 

func (v *Context) FillRule() FillRule

GetFillRule is a wrapper around cairo_get_fill_rule().

func (*Context) FontExtents 

func (v *Context) FontExtents() FontExtents

func (*Context) GroupTarget 

func (v *Context) GroupTarget() *Surface

GetGroupTarget is a wrapper around cairo_get_group_target().

func (*Context) IdentityMatrix 

func (v *Context) IdentityMatrix()

IdentityMatrix is a wrapper around cairo_identity_matrix().

Resets the current transformation matrix (CTM) by setting it equal to the identity matrix. That is, the user-space and device-space axes will be aligned and one user-space unit will transform to one device-space unit.

func (*Context) InClip 

func (v *Context) InClip(x, y float64) bool

InClip is a wrapper around cairo_in_clip().

func (*Context) InFill 

func (v *Context) InFill(x, y float64) bool

InFill is a wrapper around cairo_in_fill().

func (*Context) InStroke 

func (v *Context) InStroke(x, y float64) bool

InStroke is a wrapper around cairo_in_stroke().

func (*Context) LineCap 

func (v *Context) LineCap() LineCap

GetLineCap is a wrapper around cairo_get_line_cap().

func (*Context) LineJoin 

func (v *Context) LineJoin() LineJoin

GetLineJoin is a wrapper around cairo_get_line_join().

func (*Context) LineTo 

func (v *Context) LineTo(x, y float64)

LineTo is a wrapper around cairo_line_to().

func (*Context) LineWidth 

func (v *Context) LineWidth() float64

GetLineWidth is a wrapper cairo_get_line_width().

func (*Context) MaskSurface 

func (v *Context) MaskSurface(surface *Surface, surfaceX, surfaceY float64)

MaskSurface is a wrapper around cairo_mask_surface().

func (*Context) Matrix 

func (v *Context) Matrix() *Matrix

GetMatrix is a wrapper around cairo_get_matrix.

func (*Context) MiterLimit 

func (v *Context) MiterLimit() float64

GetMiterLimit is a wrapper around cairo_get_miter_limit().

func (*Context) MoveTo 

func (v *Context) MoveTo(x, y float64)

MoveTo is a wrapper around cairo_move_to().

func (*Context) Native 

func (v *Context) Native() uintptr

Native returns a pointer to the underlying cairo_t.

func (*Context) NewPath 

func (v *Context) NewPath()

NewPath is a wrapper around cairo_new_path().

func (*Context) NewSubPath 

func (v *Context) NewSubPath()

NewSubPath is a wrapper around cairo_new_sub_path().

func (*Context) Operator 

func (v *Context) Operator() Operator

GetOperator is a wrapper around cairo_get_operator().

func (*Context) Paint 

func (v *Context) Paint()

Paint is a wrapper around cairo_paint().

func (*Context) PaintWithAlpha 

func (v *Context) PaintWithAlpha(alpha float64)

PaintWithAlpha is a wrapper around cairo_paint_with_alpha().

func (*Context) PopGroupToSource 

func (v *Context) PopGroupToSource()

PopGroupToSource is a wrapper around cairo_pop_group_to_source().

func (*Context) PushGroup 

func (v *Context) PushGroup()

PushGroup is a wrapper around cairo_push_group().

func (*Context) PushGroupWithContent 

func (v *Context) PushGroupWithContent(content Content)

PushGroupWithContent is a wrapper around cairo_push_group_with_content().

func (*Context) Rectangle 

func (v *Context) Rectangle(x, y, w, h float64)

Rectangle is a wrapper around cairo_rectangle().

func (*Context) ResetClip 

func (v *Context) ResetClip()

ResetClip is a wrapper around cairo_reset_clip().

func (*Context) Restore 

func (v *Context) Restore()

Restore is a wrapper around cairo_restore().

func (*Context) Rotate 

func (v *Context) Rotate(angle float64)

Rotate is a wrapper around cairo_rotate.

func (*Context) Save 

func (v *Context) Save()

Save is a wrapper around cairo_save().

func (*Context) Scale 

func (v *Context) Scale(sx, sy float64)

Scale is a wrapper around cairo_scale.

func (*Context) SelectFontFace 

func (v *Context) SelectFontFace(family string, slant FontSlant, weight FontWeight)

func (*Context) SetAntialias 

func (v *Context) SetAntialias(antialias Antialias)

SetAntialias is a wrapper around cairo_set_antialias().

func (*Context) SetDash 

func (v *Context) SetDash(dashes []float64, offset float64)

SetDash is a wrapper around cairo_set_dash().

func (*Context) SetFillRule 

func (v *Context) SetFillRule(fillRule FillRule)

SetFillRule is a wrapper around cairo_set_fill_rule().

func (*Context) SetFontSize 

func (v *Context) SetFontSize(size float64)

func (*Context) SetLineCap 

func (v *Context) SetLineCap(lineCap LineCap)

SetLineCap is a wrapper around cairo_set_line_cap().

func (*Context) SetLineJoin 

func (v *Context) SetLineJoin(lineJoin LineJoin)

SetLineJoin is a wrapper around cairo_set_line_join().

func (*Context) SetLineWidth 

func (v *Context) SetLineWidth(width float64)

SetLineWidth is a wrapper around cairo_set_line_width().

func (*Context) SetMatrix 

func (v *Context) SetMatrix(matrix *Matrix)

SetMatrix is a wrapper around cairo_set_matrix.

func (*Context) SetMiterLimit 

func (v *Context) SetMiterLimit(limit float64)

SetMiterLimit is a wrapper around cairo_set_miter_limit().

func (*Context) SetOperator 

func (v *Context) SetOperator(op Operator)

SetOperator is a wrapper around cairo_set_operator().

func (*Context) SetSource 

func (v *Context) SetSource(p *Pattern)

SetSource is a wrapper around cairo_set_source().

func (*Context) SetSourceRGB 

func (v *Context) SetSourceRGB(red, green, blue float64)

SetSourceRGB is a wrapper around cairo_set_source_rgb().

func (*Context) SetSourceRGBA 

func (v *Context) SetSourceRGBA(red, green, blue, alpha float64)

SetSourceRGBA is a wrapper around cairo_set_source_rgba().

func (*Context) SetSourceSurface 

func (v *Context) SetSourceSurface(surface *Surface, x, y float64)

SetSourceSurface is a wrapper around cairo_set_source_surface().

func (*Context) SetTolerance 

func (v *Context) SetTolerance(tolerance float64)

SetTolerance is a wrapper around cairo_set_tolerance().

func (*Context) ShowPage 

func (v *Context) ShowPage()

ShowPage is a wrapper around cairo_show_page().

func (*Context) ShowText 

func (v *Context) ShowText(utf8 string)

func (*Context) Status 

func (v *Context) Status() Status

Status is a wrapper around cairo_status().

func (*Context) Stroke 

func (v *Context) Stroke()

Stroke is a wrapper around cairo_stroke().

func (*Context) StrokeExtents 

func (v *Context) StrokeExtents() (x1, y1, x2, y2 float64)

StrokeExtents is a wrapper around cairo_stroke_extents().

func (*Context) StrokePreserve 

func (v *Context) StrokePreserve()

StrokePreserve is a wrapper around cairo_stroke_preserve().

func (*Context) Target 

func (v *Context) Target() *Surface

GetTarget is a wrapper around cairo_get_target().

func (*Context) TextExtents 

func (v *Context) TextExtents(utf8 string) TextExtents

func (*Context) Tolerance 

func (v *Context) Tolerance() float64

GetTolerance is a wrapper around cairo_get_tolerance().

func (*Context) Transform 

func (v *Context) Transform(matrix *Matrix)

Transform is a wrapper around cairo_transform.

func (*Context) Translate 

func (v *Context) Translate(tx, ty float64)

Translate is a wrapper around cairo_translate.

func (*Context) UserToDevice 

func (v *Context) UserToDevice(x, y float64) (float64, float64)

UserToDevice is a wrapper around cairo_user_to_device.

func (*Context) UserToDeviceDistance 

func (v *Context) UserToDeviceDistance(dx, dy float64) (float64, float64)

UserToDeviceDistance is a wrapper around cairo_user_to_device_distance.

type FillRule 

type FillRule int

FillRule is a representation of Cairo's cairo_fill_rule_t. 

const (
	FillRuleWinding FillRule = C.CAIRO_FILL_RULE_WINDING
	FillRuleEvenOdd FillRule = C.CAIRO_FILL_RULE_EVEN_ODD
)

type Filter 

type Filter int

Filter is a representation of Cairo's cairo_filter_t. 

const (
	FilterFast     Filter = C.CAIRO_FILTER_FAST
	FilterGood     Filter = C.CAIRO_FILTER_GOOD
	FilterBest     Filter = C.CAIRO_FILTER_BEST
	FilterNearest  Filter = C.CAIRO_FILTER_NEAREST
	FilterBilinear Filter = C.CAIRO_FILTER_BILINEAR
	FilterGaussian Filter = C.CAIRO_FILTER_GAUSSIAN
)

type FontExtents 

type FontExtents struct {
	Ascent      float64
	Descent     float64
	Height      float64
	MaxXAdvance float64
	MaxYAdvance float64
}

type FontOptions 

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

FontOptions is a representation of Cairo's cairo_font_options_t.

func CreateFontOptions 

func CreateFontOptions() *FontOptions

CreatFontOptions is a wrapper around cairo_font_options_create().

func (*FontOptions) Antialias 

func (o *FontOptions) Antialias() Antialias

GetAntialias is a wrapper around cairo_font_options_get_antialias().

func (*FontOptions) Copy 

func (o *FontOptions) Copy() *FontOptions

Copy is a wrapper around cairo_font_options_copy().

func (*FontOptions) Equal 

func (o *FontOptions) Equal(other *FontOptions) bool

Equal is a wrapper around cairo_font_options_equal().

func (*FontOptions) Hash 

func (o *FontOptions) Hash() uint32

Hash is a wrapper around cairo_font_options_hash().

func (*FontOptions) HintMetrics 

func (o *FontOptions) HintMetrics() HintMetrics

GetHintMetrics is a wrapper around cairo_font_options_get_hint_metrics().

func (*FontOptions) HintStyle 

func (o *FontOptions) HintStyle() HintStyle

GetHintStyle is a wrapper around cairo_font_options_get_hint_style().

func (*FontOptions) Merge 

func (o *FontOptions) Merge(other *FontOptions)

Merge is a wrapper around cairo_font_options_merge().

func (*FontOptions) SetAntialias 

func (o *FontOptions) SetAntialias(antialias Antialias)

SetAntialias is a wrapper around cairo_font_options_set_antialias().

func (*FontOptions) SetHintMetrics 

func (o *FontOptions) SetHintMetrics(hintMetrics HintMetrics)

SetHintMetrics is a wrapper around cairo_font_options_set_hint_metrics().

func (*FontOptions) SetHintStyle 

func (o *FontOptions) SetHintStyle(hintStyle HintStyle)

SetHintStyle is a wrapper around cairo_font_options_set_hint_style().

func (*FontOptions) SetSubpixelOrder 

func (o *FontOptions) SetSubpixelOrder(subpixelOrder SubpixelOrder)

SetSubpixelOrder is a wrapper around cairo_font_options_set_subpixel_order().

func (*FontOptions) SetVariations 

func (o *FontOptions) SetVariations(variations string)

SetVariations is a wrapper around cairo_font_options_set_variations().

func (*FontOptions) Status 

func (o *FontOptions) Status() Status

Status is a wrapper around cairo_font_options_status().

func (*FontOptions) SubpixelOrder 

func (o *FontOptions) SubpixelOrder() SubpixelOrder

GetSubpixelOrder is a wrapper around cairo_font_options_get_subpixel_order().

func (*FontOptions) Variations 

func (o *FontOptions) Variations() string

GetVariations is a wrapper around cairo_font_options_get_variations().

type FontSlant 

type FontSlant int

FontSlant is a representation of Cairo's cairo_font_slant_t 

const (
	FontSlantNormal  FontSlant = C.CAIRO_FONT_SLANT_NORMAL
	FontSlantItalic  FontSlant = C.CAIRO_FONT_SLANT_ITALIC
	FontSlantOblique FontSlant = C.CAIRO_FONT_SLANT_OBLIQUE
)

type FontWeight 

type FontWeight int

FontWeight is a representation of Cairo's cairo_font_weight_t 

const (
	FontWeightNormal FontWeight = C.CAIRO_FONT_WEIGHT_NORMAL
	FontWeightBold   FontWeight = C.CAIRO_FONT_WEIGHT_BOLD
)

type Format 

type Format int

Format is a representation of Cairo's cairo_format_t. 

const (
	FormatInvalid   Format = C.CAIRO_FORMAT_INVALID
	FormatARGB32    Format = C.CAIRO_FORMAT_ARGB32
	FormatRGB24     Format = C.CAIRO_FORMAT_RGB24
	FormatA8        Format = C.CAIRO_FORMAT_A8
	FormatA1        Format = C.CAIRO_FORMAT_A1
	FormatRGB16_565 Format = C.CAIRO_FORMAT_RGB16_565
	FormatRGB30     Format = C.CAIRO_FORMAT_RGB30
)

type HintMetrics 

type HintMetrics int

HintMetrics is a representation of Cairo's cairo_hint_metrics_t. 

const (
	HintMetricsDefault HintMetrics = C.CAIRO_HINT_METRICS_DEFAULT
	HintMetricsOff     HintMetrics = C.CAIRO_HINT_METRICS_OFF
	HintMetricsOn      HintMetrics = C.CAIRO_HINT_METRICS_ON
)

type HintStyle 

type HintStyle int

HintStyle is a representation of Cairo's cairo_hint_style_t. 

const (
	HintStyleDefault HintStyle = C.CAIRO_HINT_STYLE_DEFAULT
	HintStyleNone    HintStyle = C.CAIRO_HINT_STYLE_NONE
	HintStyleSlight  HintStyle = C.CAIRO_HINT_STYLE_SLIGHT
	HintStyleMedium  HintStyle = C.CAIRO_HINT_STYLE_MEDIUM
	HintStyleFull    HintStyle = C.CAIRO_HINT_STYLE_FULL
)

type LineCap 

type LineCap int

LineCap is a representation of Cairo's cairo_line_cap_t. 

const (
	LineCapButt   LineCap = C.CAIRO_LINE_CAP_BUTT
	LineCapRound  LineCap = C.CAIRO_LINE_CAP_ROUND
	LineCapSquare LineCap = C.CAIRO_LINE_CAP_SQUARE
)

type LineJoin 

type LineJoin int

LineJoin is a representation of Cairo's cairo_line_join_t. 

const (
	LineJoinMiter LineJoin = C.CAIRO_LINE_JOIN_MITER
	LineJoinRound LineJoin = C.CAIRO_LINE_JOIN_ROUND
	LineJoinBevel LineJoin = C.CAIRO_LINE_JOIN_BEVEL
)

type Matrix 

type Matrix struct {
	Xx, Yx float64
	Xy, Yy float64
	X0, Y0 float64
}

Matrix struct

func NewMatrix 

func NewMatrix(xx, yx, xy, yy, x0, y0 float64) *Matrix

NewMatrix creates a new identiy matrix

func (*Matrix) InitIdentity 

func (m *Matrix) InitIdentity()

InitIdentity initializes this matrix to identity matrix

func (*Matrix) InitRotate 

func (m *Matrix) InitRotate(radians float64)

InitRotate initializes a matrix with the given rotation

func (*Matrix) InitScale 

func (m *Matrix) InitScale(sx, sy float64)

InitScale initializes a matrix with the give scale

func (*Matrix) InitTranslate 

func (m *Matrix) InitTranslate(tx, ty float64)

InitTranslate initializes a matrix with the given translation

func (*Matrix) Invert 

func (m *Matrix) Invert()

Invert inverts the matrix

func (*Matrix) Multiply 

func (m *Matrix) Multiply(a, b Matrix)

Multiply multiplies the matrix by another matrix

func (*Matrix) Native 

func (m *Matrix) Native() uintptr

Native returns native c pointer to a matrix

func (*Matrix) Rotate 

func (m *Matrix) Rotate(radians float64)

Rotate rotates the matrix by the given amount

func (*Matrix) Scale 

func (m *Matrix) Scale(sx, sy float64)

Scale scales the matrix by the given amounts

func (*Matrix) TransformDistance 

func (m *Matrix) TransformDistance(dx, dy float64) (float64, float64)

TransformDistance ...

func (*Matrix) TransformPoint 

func (m *Matrix) TransformPoint(x, y float64) (float64, float64)

TransformPoint ...

func (*Matrix) Translate 

func (m *Matrix) Translate(tx, ty float64)

Translate translates a matrix by the given amount

type MimeType 

type MimeType string

MimeType is a representation of Cairo's CAIRO_MIME_TYPE_* preprocessor constants. 

const (
	MIMETypeJP2      MimeType = "image/jp2"
	MIMETypeJPEG     MimeType = "image/jpeg"
	MIMETypePNG      MimeType = "image/png"
	MIMETypeURI      MimeType = "image/x-uri"
	MIMETypeUniqueID MimeType = "application/x-cairo.uuid"
)

type Operator 

type Operator int

Operator is a representation of Cairo's cairo_operator_t. 

const (
	OperatorClear         Operator = C.CAIRO_OPERATOR_CLEAR
	OperatorSource        Operator = C.CAIRO_OPERATOR_SOURCE
	OperatorOver          Operator = C.CAIRO_OPERATOR_OVER
	OperatorIn            Operator = C.CAIRO_OPERATOR_IN
	OperatorOut           Operator = C.CAIRO_OPERATOR_OUT
	OperatorAtop          Operator = C.CAIRO_OPERATOR_ATOP
	OperatorDest          Operator = C.CAIRO_OPERATOR_DEST
	OperatorDestOver      Operator = C.CAIRO_OPERATOR_DEST_OVER
	OperatorDestIn        Operator = C.CAIRO_OPERATOR_DEST_IN
	OperatorDestOut       Operator = C.CAIRO_OPERATOR_DEST_OUT
	OperatorDestAtop      Operator = C.CAIRO_OPERATOR_DEST_ATOP
	OperatorXOR           Operator = C.CAIRO_OPERATOR_XOR
	OperatorAdd           Operator = C.CAIRO_OPERATOR_ADD
	OperatorSaturate      Operator = C.CAIRO_OPERATOR_SATURATE
	OperatorMultiply      Operator = C.CAIRO_OPERATOR_MULTIPLY
	OperatorScreen        Operator = C.CAIRO_OPERATOR_SCREEN
	OperatorOverlay       Operator = C.CAIRO_OPERATOR_OVERLAY
	OperatorDarken        Operator = C.CAIRO_OPERATOR_DARKEN
	OperatorLighten       Operator = C.CAIRO_OPERATOR_LIGHTEN
	OperatorColorDodge    Operator = C.CAIRO_OPERATOR_COLOR_DODGE
	OperatorColorBurn     Operator = C.CAIRO_OPERATOR_COLOR_BURN
	OperatorHardLight     Operator = C.CAIRO_OPERATOR_HARD_LIGHT
	OperatorSoftLight     Operator = C.CAIRO_OPERATOR_SOFT_LIGHT
	OperatorDifference    Operator = C.CAIRO_OPERATOR_DIFFERENCE
	OperatorExclusion     Operator = C.CAIRO_OPERATOR_EXCLUSION
	OperatorHSLHue        Operator = C.CAIRO_OPERATOR_HSL_HUE
	OperatorHSLSaturation Operator = C.CAIRO_OPERATOR_HSL_SATURATION
	OperatorHSLColor      Operator = C.CAIRO_OPERATOR_HSL_COLOR
	OperatorHSLLuminosity Operator = C.CAIRO_OPERATOR_HSL_LUMINOSITY
)

type Pattern 

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

Pattern is a representation of Cairo's cairo_pattern_t.

func NewPatternForSurface 

func NewPatternForSurface(s *Surface) (*Pattern, error)

NewPatternForSurface is a wrapper around cairo_pattern_create_for_surface().

func NewPatternFromRGB 

func NewPatternFromRGB(red, green, blue float64) (*Pattern, error)

NewPatternFromRGB is a wrapper around cairo_pattern_create_rgb().

func NewPatternFromRGBA 

func NewPatternFromRGBA(red, green, blue, alpha float64) (*Pattern, error)

NewPatternFromRGBA is a wrapper around cairo_pattern_create_rgba().

func NewPatternLinear 

func NewPatternLinear(x0, y0, x1, y1 float64) (*Pattern, error)

NewPatternLinear is a wrapper around cairo_pattern_create_linear().

func NewPatternRadial 

func NewPatternRadial(x0, y0, r0, x1, y1, r1 float64) (*Pattern, error)

NewPatternRadial is a wrapper around cairo_pattern_create_radial().

func (*Pattern) AddColorStopRGB 

func (v *Pattern) AddColorStopRGB(offset, red, green, blue float64) error

AddColorStopRGB is a wrapper around cairo_pattern_add_color_stop_rgb().

func (*Pattern) AddColorStopRGBA 

func (v *Pattern) AddColorStopRGBA(offset, red, green, blue, alpha float64) error

AddColorStopRGBA is a wrapper around cairo_pattern_add_color_stop_rgba().

func (*Pattern) Native 

func (v *Pattern) Native() uintptr

Native returns a pointer to the underlying cairo_pattern_t.

func (*Pattern) PatternGetFilter 

func (v *Pattern) PatternGetFilter() Filter

PatternGetFilter is a wrapper around cairo_pattern_get_filter().

func (*Pattern) PatternSetFilter 

func (v *Pattern) PatternSetFilter(filter Filter)

PatternSetFilter is a wrapper around cairo_pattern_set_filter().

func (*Pattern) Status 

func (v *Pattern) Status() Status

Status is a wrapper around cairo_pattern_status().

type Rectangle 

type Rectangle struct {
	X, Y          int
	Width, Height int
}

Rectangle is a representation of Cairo's cairo_rectangle_int_t.

func RectangleNew 

func RectangleNew(x, y, width, height int) *Rectangle

commodity function to ceate Rectangle cairo object.

type Region 

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

Region is a representation of Cairo's cairo_region_t.

func RegionCreate 

func RegionCreate() (*Region, error)

RegionCreate is a wrapper around cairo_region_create().

func (*Region) ContainsPoint 

func (v *Region) ContainsPoint(x, y int) bool

ContainsPoint is a wrapper around cairo_region_contains_point().

func (*Region) ContainsRectangle 

func (v *Region) ContainsRectangle(rectangle *Rectangle) RegionOverlap

ContainsRectangle is a wrapper around cairo_region_contains_rectangle().

func (*Region) Copy 

func (v *Region) Copy() (*Region, error)

Copy is a wrapper around cairo_region_copy().

func (*Region) CreateRectangle 

func (v *Region) CreateRectangle(rectangle *Rectangle) (*Region, error)

CreateRectangle is a wrapper around cairo_region_create_rectangle().

func (*Region) CreateRectangles 

func (v *Region) CreateRectangles(rectangles ...*Rectangle) (*Region, error)

CreateRectangles is a wrapper around cairo_region_create_rectangles().

func (*Region) Equal 

func (v *Region) Equal(region *Region) bool

Equal is a wrapper around cairo_region_equal().

func (*Region) Extents 

func (v *Region) Extents(extents *Rectangle)

GetExtents is a wrapper around cairo_region_get_extents().

func (*Region) Intersect 

func (v *Region) Intersect(other *Region) (*Region, error)

Intersect is a wrapper around cairo_region_intersect(). Note: contrary to the original statement, the source 'Region' remains preserved.

func (*Region) IntersectRectangle 

func (v *Region) IntersectRectangle(rectangle *Rectangle) (*Region, error)

IntersectRectangle is a wrapper around cairo_region_intersect_rectangle(). Note: contrary to the original statement, the source 'Region' remains preserved.

func (*Region) IsEmpty 

func (v *Region) IsEmpty() bool

IsEmpty is a wrapper around cairo_region_is_empty().

func (*Region) Native 

func (v *Region) Native() uintptr

Native returns a pointer to the underlying cairo_region_t.

func (*Region) NumRectangles 

func (v *Region) NumRectangles() int

NumRectangles is a wrapper around cairo_region_num_rectangles().

func (*Region) Rectangle 

func (v *Region) Rectangle(nth int) *Rectangle

GetRectangle is a wrapper around cairo_region_get_rectangle().

func (*Region) Status 

func (v *Region) Status() Status

Status is a wrapper around cairo_region_status().

func (*Region) Substract 

func (v *Region) Substract(other *Region) (*Region, error)

Substract is a wrapper around cairo_region_subtract(). Note: contrary to the original statement, the source 'Region' remains preserved.

func (*Region) SubstractRectangle 

func (v *Region) SubstractRectangle(rectangle *Rectangle) (*Region, error)

SubstractRectangle is a wrapper around cairo_region_subtract_rectangle(). Note: contrary to the original statement, the source 'Region' remains preserved.

func (*Region) Translate 

func (v *Region) Translate(dx, dy int)

Translate is a wrapper around cairo_region_translate().

func (*Region) Union 

func (v *Region) Union(other *Region) (*Region, error)

Union is a wrapper around cairo_region_union(). Note: contrary to the original statement, the source 'Region' remains preserved.

func (*Region) UnionRectangle 

func (v *Region) UnionRectangle(rectangle *Rectangle) (*Region, error)

UnionRectangle is a wrapper around cairo_region_union_rectangle(). Note: contrary to the original statement, the source 'Region' remains preserved.

func (*Region) Xor 

func (v *Region) Xor(other *Region) (*Region, error)

Xor is a wrapper around cairo_region_xor(). Note: contrary to the original statement, the source 'Region' remains preserved.

func (*Region) XorRectangle 

func (v *Region) XorRectangle(rectangle *Rectangle) (*Region, error)

XorRectangle is a wrapper around cairo_region_xor_rectangle(). Note: contrary to the original statement, the source 'Region' remains preserved.

type RegionOverlap 

type RegionOverlap int

RegionOverlap is a representation of Cairo's cairo_region_overlap_t. 

const (
	RegionOverlapIn   RegionOverlap = C.CAIRO_REGION_OVERLAP_IN
	RegionOverlapOut  RegionOverlap = C.CAIRO_REGION_OVERLAP_OUT
	RegionOverlapPart RegionOverlap = C.CAIRO_REGION_OVERLAP_PART
)

type Status 

type Status int

Status is a representation of Cairo's cairo_status_t. 

const (
	StatusSuccess                Status = C.CAIRO_STATUS_SUCCESS
	StatusNoMemory               Status = C.CAIRO_STATUS_NO_MEMORY
	StatusInvalidRestore         Status = C.CAIRO_STATUS_INVALID_RESTORE
	StatusInvalidPopGroup        Status = C.CAIRO_STATUS_INVALID_POP_GROUP
	StatusNoCurrentPoint         Status = C.CAIRO_STATUS_NO_CURRENT_POINT
	StatusInvalidMatrix          Status = C.CAIRO_STATUS_INVALID_MATRIX
	StatusInvalidStatus          Status = C.CAIRO_STATUS_INVALID_STATUS
	StatusNullPointer            Status = C.CAIRO_STATUS_NULL_POINTER
	StatusInvalidString          Status = C.CAIRO_STATUS_INVALID_STRING
	StatusInvalidPathData        Status = C.CAIRO_STATUS_INVALID_PATH_DATA
	StatusReadError              Status = C.CAIRO_STATUS_READ_ERROR
	StatusWriteError             Status = C.CAIRO_STATUS_WRITE_ERROR
	StatusSurfaceFinished        Status = C.CAIRO_STATUS_SURFACE_FINISHED
	StatusSurfaceTypeMismatch    Status = C.CAIRO_STATUS_SURFACE_TYPE_MISMATCH
	StatusPatternTypeMismatch    Status = C.CAIRO_STATUS_PATTERN_TYPE_MISMATCH
	StatusInvalidContent         Status = C.CAIRO_STATUS_INVALID_CONTENT
	StatusInvalidFormat          Status = C.CAIRO_STATUS_INVALID_FORMAT
	StatusInvalidVisual          Status = C.CAIRO_STATUS_INVALID_VISUAL
	StatusFileNotFound           Status = C.CAIRO_STATUS_FILE_NOT_FOUND
	StatusInvalidDash            Status = C.CAIRO_STATUS_INVALID_DASH
	StatusInvalidDSCComment      Status = C.CAIRO_STATUS_INVALID_DSC_COMMENT
	StatusInvalidIndex           Status = C.CAIRO_STATUS_INVALID_INDEX
	StatusClipNotRepresentable   Status = C.CAIRO_STATUS_CLIP_NOT_REPRESENTABLE
	StatusTempFileError          Status = C.CAIRO_STATUS_TEMP_FILE_ERROR
	StatusInvalidStride          Status = C.CAIRO_STATUS_INVALID_STRIDE
	StatusFontTypeMismatch       Status = C.CAIRO_STATUS_FONT_TYPE_MISMATCH
	StatusUserFontImmutable      Status = C.CAIRO_STATUS_USER_FONT_IMMUTABLE
	StatusUserFontError          Status = C.CAIRO_STATUS_USER_FONT_ERROR
	StatusNegativeCount          Status = C.CAIRO_STATUS_NEGATIVE_COUNT
	StatusInvalidClusters        Status = C.CAIRO_STATUS_INVALID_CLUSTERS
	StatusInvalidSlant           Status = C.CAIRO_STATUS_INVALID_SLANT
	StatusInvalidWeight          Status = C.CAIRO_STATUS_INVALID_WEIGHT
	StatusInvalidSize            Status = C.CAIRO_STATUS_INVALID_SIZE
	StatusUserFontNotImplemented Status = C.CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED
	StatusDeviceTypeMismatch     Status = C.CAIRO_STATUS_DEVICE_TYPE_MISMATCH
	StatusDeviceError            Status = C.CAIRO_STATUS_DEVICE_ERROR
)

func (Status) Error 

func (s Status) Error() string

Error implements error. It calls String() unless s is StatusSuccess.

func (Status) String 

func (s Status) String() string

String returns a readable status messsage usable in texts.

func (Status) ToError 

func (s Status) ToError() error

ToError returns the error for the status. Returns nil if success.

type SubpixelOrder 

type SubpixelOrder int

SubpixelOrder is a representation of Cairo's cairo_subpixel_order_t. 

const (
	SubpixelOrderDefault SubpixelOrder = C.CAIRO_SUBPIXEL_ORDER_DEFAULT
	SubpixelOrderRGB     SubpixelOrder = C.CAIRO_SUBPIXEL_ORDER_RGB
	SubpixelOrderBGR     SubpixelOrder = C.CAIRO_SUBPIXEL_ORDER_BGR
	SubpixelOrderVRGB    SubpixelOrder = C.CAIRO_SUBPIXEL_ORDER_VRGB
	SubpixelOrderVBGR    SubpixelOrder = C.CAIRO_SUBPIXEL_ORDER_VBGR
)

type Surface 

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

Surface is a representation of Cairo's cairo_surface_t.

func CreateImageSurface 

func CreateImageSurface(format Format, width, height int) *Surface

CreateImageSurface is a wrapper around cairo_image_surface_create().

func CreateImageSurfaceForData 

func CreateImageSurfaceForData(data []byte, format Format, width, height, stride int) *Surface

CreateImageSurfaceForData is a wrapper around cairo_image_surface_create_for_data().

func CreatePDFSurface 

func CreatePDFSurface(fileName string, width float64, height float64) (*Surface, error)

CreatePDFSurface is a wrapper around cairo_pdf_surface_create().

func CreatePNGSurfaceFromPNG 

func CreatePNGSurfaceFromPNG(fileName string) (*Surface, error)

CreatePNGSurface is a wrapper around cairo_image_surface_create_from_png().

func CreateSurfaceFromImage 

func CreateSurfaceFromImage(img image.Image) *Surface

CreateSurfaceFromImage is a better wrapper around cairo_image_surface_create_for_data().

func NewSurface 

func NewSurface(s uintptr, needsRef bool) *Surface

NewSurface creates a gotk3 cairo Surface from a pointer to a C cairo_surface_t. This is primarily designed for use with other gotk3 packages and should be avoided by applications.

func WrapSurface 

func WrapSurface(s uintptr) *Surface

func (*Surface) Close 

func (v *Surface) Close()

Closes the surface. The surface must not be used afterwards.

func (*Surface) CopyPage 

func (v *Surface) CopyPage()

CopyPage is a wrapper around cairo_surface_copy_page().

func (*Surface) CreateForRectangle 

func (v *Surface) CreateForRectangle(x, y, width, height float64) *Surface

CreateForRectangle is a wrapper around cairo_surface_create_for_rectangle().

func (*Surface) CreateSimilar 

func (v *Surface) CreateSimilar(content Content, width, height int) *Surface

CreateSimilar is a wrapper around cairo_surface_create_similar().

func (*Surface) Data 

func (v *Surface) Data() []byte

GetData is a wrapper around cairo_image_surface_get_data().

func (*Surface) DeviceOffset 

func (v *Surface) DeviceOffset() (x, y float64)

GetDeviceOffset is a wrapper around cairo_surface_get_device_offset().

func (*Surface) FallbackResolution 

func (v *Surface) FallbackResolution() (xPPI, yPPI float64)

GetFallbackResolution is a wrapper around cairo_surface_get_fallback_resolution().

func (*Surface) Flush 

func (v *Surface) Flush()

Flush is a wrapper around cairo_surface_flush().

func (*Surface) HasShowTextGlyphs 

func (v *Surface) HasShowTextGlyphs() bool

HasShowTextGlyphs is a wrapper around cairo_surface_has_show_text_glyphs().

func (*Surface) Height 

func (v *Surface) Height() int

GetHeight is a wrapper around cairo_image_surface_get_height().

func (*Surface) MarkDirty 

func (v *Surface) MarkDirty()

MarkDirty is a wrapper around cairo_surface_mark_dirty().

func (*Surface) MarkDirtyRectangle 

func (v *Surface) MarkDirtyRectangle(x, y, width, height int)

MarkDirtyRectangle is a wrapper around cairo_surface_mark_dirty_rectangle().

func (*Surface) MimeData 

func (v *Surface) MimeData(mimeType MimeType) []byte

GetMimeData is a wrapper around cairo_surface_get_mime_data(). The returned mimetype data is returned as a Go byte slice.

func (*Surface) Native 

func (v *Surface) Native() uintptr

Native returns a pointer to the underlying cairo_surface_t.

func (*Surface) SetDeviceOffset 

func (v *Surface) SetDeviceOffset(x, y float64)

SetDeviceOffset is a wrapper around cairo_surface_set_device_offset().

func (*Surface) SetFallbackResolution 

func (v *Surface) SetFallbackResolution(xPPI, yPPI float64)

SetFallbackResolution is a wrapper around cairo_surface_set_fallback_resolution().

func (*Surface) ShowPage 

func (v *Surface) ShowPage()

ShowPage is a wrapper around cairo_surface_show_page().

func (*Surface) Status 

func (v *Surface) Status() Status

Status is a wrapper around cairo_surface_status().

func (*Surface) Stride 

func (v *Surface) Stride() int

GetStride is a wrapper around cairo_image_surface_get_stride().

func (*Surface) Type 

func (v *Surface) Type() SurfaceType

GetType is a wrapper around cairo_surface_get_type().

func (*Surface) Width 

func (v *Surface) Width() int

GetWidth is a wrapper around cairo_image_surface_get_width().

func (*Surface) WriteToPNG 

func (v *Surface) WriteToPNG(fileName string) error

WriteToPNG is a wrapper around cairo_surface_write_png(). It writes the Cairo surface to the given file in PNG format.

func (*Surface) WriteToPNGWriter 

func (v *Surface) WriteToPNGWriter(w io.Writer) error

WriteToPNGWriter is a wrapper around cairo_surface_write_png_stream(). It writes the Cairo surface to the given io.Writer in PNG format.

type SurfaceType 

type SurfaceType int

SurfaceType is a representation of Cairo's cairo_surface_type_t. 

const (
	SurfaceTypeImage         SurfaceType = C.CAIRO_SURFACE_TYPE_IMAGE
	SurfaceTypePDF           SurfaceType = C.CAIRO_SURFACE_TYPE_PDF
	SurfaceTypePS            SurfaceType = C.CAIRO_SURFACE_TYPE_PS
	SurfaceTypeXlib          SurfaceType = C.CAIRO_SURFACE_TYPE_XLIB
	SurfaceTypeXCB           SurfaceType = C.CAIRO_SURFACE_TYPE_XCB
	SurfaceTypeGlitz         SurfaceType = C.CAIRO_SURFACE_TYPE_GLITZ
	SurfaceTypeQuartz        SurfaceType = C.CAIRO_SURFACE_TYPE_QUARTZ
	SurfaceTypeWin32         SurfaceType = C.CAIRO_SURFACE_TYPE_WIN32
	SurfaceTypeBeOS          SurfaceType = C.CAIRO_SURFACE_TYPE_BEOS
	SurfaceTypeDirectFB      SurfaceType = C.CAIRO_SURFACE_TYPE_DIRECTFB
	SurfaceTypeSVG           SurfaceType = C.CAIRO_SURFACE_TYPE_SVG
	SurfaceTypeOS2           SurfaceType = C.CAIRO_SURFACE_TYPE_OS2
	SurfaceTypeWin32Printing SurfaceType = C.CAIRO_SURFACE_TYPE_WIN32_PRINTING
	SurfaceTypeQuartzImage   SurfaceType = C.CAIRO_SURFACE_TYPE_QUARTZ_IMAGE
	SurfaceTypeScript        SurfaceType = C.CAIRO_SURFACE_TYPE_SCRIPT
	SurfaceTypeQt            SurfaceType = C.CAIRO_SURFACE_TYPE_QT
	SurfaceTypeRecording     SurfaceType = C.CAIRO_SURFACE_TYPE_RECORDING
	SurfaceTypeVG            SurfaceType = C.CAIRO_SURFACE_TYPE_VG
	SurfaceTypeGL            SurfaceType = C.CAIRO_SURFACE_TYPE_GL
	SurfaceTypeDRM           SurfaceType = C.CAIRO_SURFACE_TYPE_DRM
	SurfaceTypeTee           SurfaceType = C.CAIRO_SURFACE_TYPE_TEE
	SurfaceTypeXML           SurfaceType = C.CAIRO_SURFACE_TYPE_XML
	SurfaceTypeSKia          SurfaceType = C.CAIRO_SURFACE_TYPE_SKIA
	SurfaceTypeSubsurface    SurfaceType = C.CAIRO_SURFACE_TYPE_SUBSURFACE
)

type TextExtents 

type TextExtents struct {
	XBearing float64
	YBearing float64
	Width    float64
	Height   float64
	XAdvance float64
	YAdvance float64
}

Source Files

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Directories

Path Synopsis
Package swizzle provides functions for converting between RGBA pixel formats.
 Package swizzle provides functions for converting between RGBA pixel formats.

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