cairo

package
Version: v0.6.1 Latest Latest
Warning

This package is not in the latest version of its module.

Go to latest
Published: Jun 26, 2021 License: ISC Imports: 7 Imported by: 74

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().

func StatusToString

func StatusToString(status Status) string

Types

type Antialias

type Antialias int

Antialias is a representation of Cairo's cairo_antialias_t.

const (
	ANTIALIAS_DEFAULT  Antialias = C.CAIRO_ANTIALIAS_DEFAULT
	ANTIALIAS_NONE     Antialias = C.CAIRO_ANTIALIAS_NONE
	ANTIALIAS_GRAY     Antialias = C.CAIRO_ANTIALIAS_GRAY
	ANTIALIAS_SUBPIXEL Antialias = C.CAIRO_ANTIALIAS_SUBPIXEL
	ANTIALIAS_FAST     Antialias = C.CAIRO_ANTIALIAS_FAST // (since 1.12)
	ANTIALIAS_GOOD     Antialias = C.CAIRO_ANTIALIAS_GOOD // (since 1.12)
	ANTIALIAS_BEST     Antialias = C.CAIRO_ANTIALIAS_BEST // (since 1.12)
)

type Content

type Content int

Content is a representation of Cairo's cairo_content_t.

const (
	CONTENT_COLOR       Content = C.CAIRO_CONTENT_COLOR
	CONTENT_ALPHA       Content = C.CAIRO_CONTENT_ALPHA
	CONTENT_COLOR_ALPHA 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) 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) CurveTo

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

CurveTo is a wrapper around cairo_curve_to().

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) FontExtents

func (v *Context) FontExtents() FontExtents

func (*Context) GetAntialias

func (v *Context) GetAntialias() Antialias

GetAntialias is a wrapper around cairo_get_antialias().

func (*Context) GetCContext

func (v *Context) GetCContext() *C.cairo_t

func (*Context) GetCurrentPoint

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

GetCurrentPoint is a wrapper around cairo_get_current_point().

func (*Context) GetDash

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

GetDash is a wrapper around cairo_get_dash().

func (*Context) GetDashCount

func (v *Context) GetDashCount() int

GetDashCount is a wrapper around cairo_get_dash_count().

func (*Context) GetFillRule

func (v *Context) GetFillRule() FillRule

GetFillRule is a wrapper around cairo_get_fill_rule().

func (*Context) GetGroupTarget

func (v *Context) GetGroupTarget() *Surface

GetGroupTarget is a wrapper around cairo_get_group_target().

func (*Context) GetLineCap

func (v *Context) GetLineCap() LineCap

GetLineCap is a wrapper around cairo_get_line_cap().

func (*Context) GetLineJoin

func (v *Context) GetLineJoin() LineJoin

GetLineJoin is a wrapper around cairo_get_line_join().

func (*Context) GetLineWidth

func (v *Context) GetLineWidth() float64

GetLineWidth is a wrapper cairo_get_line_width().

func (*Context) GetMatrix

func (v *Context) GetMatrix() *Matrix

GetMatrix is a wrapper around cairo_get_matrix.

func (*Context) GetMiterLimit

func (v *Context) GetMiterLimit() float64

GetMiterLimit is a wrapper around cairo_get_miter_limit().

func (*Context) GetOperator

func (v *Context) GetOperator() Operator

GetOperator is a wrapper around cairo_get_operator().

func (*Context) GetTarget

func (v *Context) GetTarget() *Surface

GetTarget is a wrapper around cairo_get_target().

func (*Context) GetTolerance

func (v *Context) GetTolerance() float64

GetTolerance is a wrapper around cairo_get_tolerance().

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) LineTo

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

LineTo is a wrapper around cairo_line_to().

func (*Context) MaskSurface

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

MaskSurface is a wrapper around cairo_mask_surface().

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) 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) TextExtents

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

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 ErrorStatus

type ErrorStatus Status

func (ErrorStatus) Error

func (e ErrorStatus) Error() string

type FillRule

type FillRule int

FillRule is a representation of Cairo's cairo_fill_rule_t.

const (
	FILL_RULE_WINDING  FillRule = C.CAIRO_FILL_RULE_WINDING
	FILL_RULE_EVEN_ODD FillRule = C.CAIRO_FILL_RULE_EVEN_ODD
)

type FontExtents

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

type FontSlant

type FontSlant int

FontSlant is a representation of Cairo's cairo_font_slant_t

const (
	FONT_SLANT_NORMAL  FontSlant = C.CAIRO_FONT_SLANT_NORMAL
	FONT_SLANT_ITALIC  FontSlant = C.CAIRO_FONT_SLANT_ITALIC
	FONT_SLANT_OBLIQUE FontSlant = C.CAIRO_FONT_SLANT_OBLIQUE
)

type FontWeight

type FontWeight int

FontWeight is a representation of Cairo's cairo_font_weight_t

const (
	FONT_WEIGHT_NORMAL FontWeight = C.CAIRO_FONT_WEIGHT_NORMAL
	FONT_WEIGHT_BOLD   FontWeight = C.CAIRO_FONT_WEIGHT_BOLD
)

type Format

type Format int

Format is a representation of Cairo's cairo_format_t.

const (
	FORMAT_INVALID   Format = C.CAIRO_FORMAT_INVALID
	FORMAT_ARGB32    Format = C.CAIRO_FORMAT_ARGB32
	FORMAT_RGB24     Format = C.CAIRO_FORMAT_RGB24
	FORMAT_A8        Format = C.CAIRO_FORMAT_A8
	FORMAT_A1        Format = C.CAIRO_FORMAT_A1
	FORMAT_RGB16_565 Format = C.CAIRO_FORMAT_RGB16_565
	FORMAT_RGB30     Format = C.CAIRO_FORMAT_RGB30
)

type LineCap

type LineCap int

LineCap is a representation of Cairo's cairo_line_cap_t.

const (
	LINE_CAP_BUTT   LineCap = C.CAIRO_LINE_CAP_BUTT
	LINE_CAP_ROUND  LineCap = C.CAIRO_LINE_CAP_ROUND
	LINE_CAP_SQUARE LineCap = C.CAIRO_LINE_CAP_SQUARE
)

type LineJoin

type LineJoin int

LineJoin is a representation of Cairo's cairo_line_join_t.

const (
	LINE_JOIN_MITER LineJoin = C.CAIRO_LINE_JOIN_MITER
	LINE_JOIN_ROUND LineJoin = C.CAIRO_LINE_JOIN_ROUND
	LINE_JOIN_BEVEL 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 (
	MIME_TYPE_JP2       MimeType = "image/jp2"
	MIME_TYPE_JPEG      MimeType = "image/jpeg"
	MIME_TYPE_PNG       MimeType = "image/png"
	MIME_TYPE_URI       MimeType = "image/x-uri"
	MIME_TYPE_UNIQUE_ID MimeType = "application/x-cairo.uuid"
)

type Operator

type Operator int

Operator is a representation of Cairo's cairo_operator_t.

const (
	OPERATOR_CLEAR          Operator = C.CAIRO_OPERATOR_CLEAR
	OPERATOR_SOURCE         Operator = C.CAIRO_OPERATOR_SOURCE
	OPERATOR_OVER           Operator = C.CAIRO_OPERATOR_OVER
	OPERATOR_IN             Operator = C.CAIRO_OPERATOR_IN
	OPERATOR_OUT            Operator = C.CAIRO_OPERATOR_OUT
	OPERATOR_ATOP           Operator = C.CAIRO_OPERATOR_ATOP
	OPERATOR_DEST           Operator = C.CAIRO_OPERATOR_DEST
	OPERATOR_DEST_OVER      Operator = C.CAIRO_OPERATOR_DEST_OVER
	OPERATOR_DEST_IN        Operator = C.CAIRO_OPERATOR_DEST_IN
	OPERATOR_DEST_OUT       Operator = C.CAIRO_OPERATOR_DEST_OUT
	OPERATOR_DEST_ATOP      Operator = C.CAIRO_OPERATOR_DEST_ATOP
	OPERATOR_XOR            Operator = C.CAIRO_OPERATOR_XOR
	OPERATOR_ADD            Operator = C.CAIRO_OPERATOR_ADD
	OPERATOR_SATURATE       Operator = C.CAIRO_OPERATOR_SATURATE
	OPERATOR_MULTIPLY       Operator = C.CAIRO_OPERATOR_MULTIPLY
	OPERATOR_SCREEN         Operator = C.CAIRO_OPERATOR_SCREEN
	OPERATOR_OVERLAY        Operator = C.CAIRO_OPERATOR_OVERLAY
	OPERATOR_DARKEN         Operator = C.CAIRO_OPERATOR_DARKEN
	OPERATOR_LIGHTEN        Operator = C.CAIRO_OPERATOR_LIGHTEN
	OPERATOR_COLOR_DODGE    Operator = C.CAIRO_OPERATOR_COLOR_DODGE
	OPERATOR_COLOR_BURN     Operator = C.CAIRO_OPERATOR_COLOR_BURN
	OPERATOR_HARD_LIGHT     Operator = C.CAIRO_OPERATOR_HARD_LIGHT
	OPERATOR_SOFT_LIGHT     Operator = C.CAIRO_OPERATOR_SOFT_LIGHT
	OPERATOR_DIFFERENCE     Operator = C.CAIRO_OPERATOR_DIFFERENCE
	OPERATOR_EXCLUSION      Operator = C.CAIRO_OPERATOR_EXCLUSION
	OPERATOR_HSL_HUE        Operator = C.CAIRO_OPERATOR_HSL_HUE
	OPERATOR_HSL_SATURATION Operator = C.CAIRO_OPERATOR_HSL_SATURATION
	OPERATOR_HSL_COLOR      Operator = C.CAIRO_OPERATOR_HSL_COLOR
	OPERATOR_HSL_LUMINOSITY 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) 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) GetExtents

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

GetExtents is a wrapper around cairo_region_get_extents().

func (*Region) GetRectangle

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

GetRectangle is a wrapper around cairo_region_get_rectangle().

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) 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 (
	REGION_OVERLAP_IN   RegionOverlap = C.CAIRO_REGION_OVERLAP_IN
	REGION_OVERLAP_OUT  RegionOverlap = C.CAIRO_REGION_OVERLAP_OUT
	REGION_OVERLAP_PART RegionOverlap = C.CAIRO_REGION_OVERLAP_PART
)

type Status

type Status int

Status is a representation of Cairo's cairo_status_t.

const (
	STATUS_SUCCESS                   Status = C.CAIRO_STATUS_SUCCESS
	STATUS_NO_MEMORY                 Status = C.CAIRO_STATUS_NO_MEMORY
	STATUS_INVALID_RESTORE           Status = C.CAIRO_STATUS_INVALID_RESTORE
	STATUS_INVALID_POP_GROUP         Status = C.CAIRO_STATUS_INVALID_POP_GROUP
	STATUS_NO_CURRENT_POINT          Status = C.CAIRO_STATUS_NO_CURRENT_POINT
	STATUS_INVALID_MATRIX            Status = C.CAIRO_STATUS_INVALID_MATRIX
	STATUS_INVALID_STATUS            Status = C.CAIRO_STATUS_INVALID_STATUS
	STATUS_NULL_POINTER              Status = C.CAIRO_STATUS_NULL_POINTER
	STATUS_INVALID_STRING            Status = C.CAIRO_STATUS_INVALID_STRING
	STATUS_INVALID_PATH_DATA         Status = C.CAIRO_STATUS_INVALID_PATH_DATA
	STATUS_READ_ERROR                Status = C.CAIRO_STATUS_READ_ERROR
	STATUS_WRITE_ERROR               Status = C.CAIRO_STATUS_WRITE_ERROR
	STATUS_SURFACE_FINISHED          Status = C.CAIRO_STATUS_SURFACE_FINISHED
	STATUS_SURFACE_TYPE_MISMATCH     Status = C.CAIRO_STATUS_SURFACE_TYPE_MISMATCH
	STATUS_PATTERN_TYPE_MISMATCH     Status = C.CAIRO_STATUS_PATTERN_TYPE_MISMATCH
	STATUS_INVALID_CONTENT           Status = C.CAIRO_STATUS_INVALID_CONTENT
	STATUS_INVALID_FORMAT            Status = C.CAIRO_STATUS_INVALID_FORMAT
	STATUS_INVALID_VISUAL            Status = C.CAIRO_STATUS_INVALID_VISUAL
	STATUS_FILE_NOT_FOUND            Status = C.CAIRO_STATUS_FILE_NOT_FOUND
	STATUS_INVALID_DASH              Status = C.CAIRO_STATUS_INVALID_DASH
	STATUS_INVALID_DSC_COMMENT       Status = C.CAIRO_STATUS_INVALID_DSC_COMMENT
	STATUS_INVALID_INDEX             Status = C.CAIRO_STATUS_INVALID_INDEX
	STATUS_CLIP_NOT_REPRESENTABLE    Status = C.CAIRO_STATUS_CLIP_NOT_REPRESENTABLE
	STATUS_TEMP_FILE_ERROR           Status = C.CAIRO_STATUS_TEMP_FILE_ERROR
	STATUS_INVALID_STRIDE            Status = C.CAIRO_STATUS_INVALID_STRIDE
	STATUS_FONT_TYPE_MISMATCH        Status = C.CAIRO_STATUS_FONT_TYPE_MISMATCH
	STATUS_USER_FONT_IMMUTABLE       Status = C.CAIRO_STATUS_USER_FONT_IMMUTABLE
	STATUS_USER_FONT_ERROR           Status = C.CAIRO_STATUS_USER_FONT_ERROR
	STATUS_NEGATIVE_COUNT            Status = C.CAIRO_STATUS_NEGATIVE_COUNT
	STATUS_INVALID_CLUSTERS          Status = C.CAIRO_STATUS_INVALID_CLUSTERS
	STATUS_INVALID_SLANT             Status = C.CAIRO_STATUS_INVALID_SLANT
	STATUS_INVALID_WEIGHT            Status = C.CAIRO_STATUS_INVALID_WEIGHT
	STATUS_INVALID_SIZE              Status = C.CAIRO_STATUS_INVALID_SIZE
	STATUS_USER_FONT_NOT_IMPLEMENTED Status = C.CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED
	STATUS_DEVICE_TYPE_MISMATCH      Status = C.CAIRO_STATUS_DEVICE_TYPE_MISMATCH
	STATUS_DEVICE_ERROR              Status = C.CAIRO_STATUS_DEVICE_ERROR
)

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 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, error)

CreateImageSurfaceForData is a wrapper around cairo_image_surface_create_for_data().

func CreatePDFSurface

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

/ Create a new PDF surface.

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 NewSurfaceFromPNG

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

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) Flush

func (v *Surface) Flush()

Flush is a wrapper around cairo_surface_flush().

func (*Surface) GetCSurface

func (v *Surface) GetCSurface() *C.cairo_surface_t

func (*Surface) GetData

func (v *Surface) GetData() unsafe.Pointer

GetData is a wrapper around cairo_image_surface_get_data().

func (*Surface) GetDeviceOffset

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

GetDeviceOffset is a wrapper around cairo_surface_get_device_offset().

func (*Surface) GetFallbackResolution

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

GetFallbackResolution is a wrapper around cairo_surface_get_fallback_resolution().

func (*Surface) GetHeight

func (v *Surface) GetHeight() int

GetHeight is a wrapper around cairo_image_surface_get_height().

func (*Surface) GetMimeData

func (v *Surface) GetMimeData(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) GetType

func (v *Surface) GetType() SurfaceType

GetType is a wrapper around cairo_surface_get_type().

func (*Surface) GetWidth

func (v *Surface) GetWidth() int

GetWidth is a wrapper around cairo_image_surface_get_width().

func (*Surface) HasShowTextGlyphs

func (v *Surface) HasShowTextGlyphs() bool

HasShowTextGlyphs is a wrapper around cairo_surface_has_show_text_glyphs().

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) 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) 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.

type SurfaceType

type SurfaceType int

SurfaceType is a representation of Cairo's cairo_surface_type_t.

const (
	SURFACE_TYPE_IMAGE          SurfaceType = C.CAIRO_SURFACE_TYPE_IMAGE
	SURFACE_TYPE_PDF            SurfaceType = C.CAIRO_SURFACE_TYPE_PDF
	SURFACE_TYPE_PS             SurfaceType = C.CAIRO_SURFACE_TYPE_PS
	SURFACE_TYPE_XLIB           SurfaceType = C.CAIRO_SURFACE_TYPE_XLIB
	SURFACE_TYPE_XCB            SurfaceType = C.CAIRO_SURFACE_TYPE_XCB
	SURFACE_TYPE_GLITZ          SurfaceType = C.CAIRO_SURFACE_TYPE_GLITZ
	SURFACE_TYPE_QUARTZ         SurfaceType = C.CAIRO_SURFACE_TYPE_QUARTZ
	SURFACE_TYPE_WIN32          SurfaceType = C.CAIRO_SURFACE_TYPE_WIN32
	SURFACE_TYPE_BEOS           SurfaceType = C.CAIRO_SURFACE_TYPE_BEOS
	SURFACE_TYPE_DIRECTFB       SurfaceType = C.CAIRO_SURFACE_TYPE_DIRECTFB
	SURFACE_TYPE_SVG            SurfaceType = C.CAIRO_SURFACE_TYPE_SVG
	SURFACE_TYPE_OS2            SurfaceType = C.CAIRO_SURFACE_TYPE_OS2
	SURFACE_TYPE_WIN32_PRINTING SurfaceType = C.CAIRO_SURFACE_TYPE_WIN32_PRINTING
	SURFACE_TYPE_QUARTZ_IMAGE   SurfaceType = C.CAIRO_SURFACE_TYPE_QUARTZ_IMAGE
	SURFACE_TYPE_SCRIPT         SurfaceType = C.CAIRO_SURFACE_TYPE_SCRIPT
	SURFACE_TYPE_QT             SurfaceType = C.CAIRO_SURFACE_TYPE_QT
	SURFACE_TYPE_RECORDING      SurfaceType = C.CAIRO_SURFACE_TYPE_RECORDING
	SURFACE_TYPE_VG             SurfaceType = C.CAIRO_SURFACE_TYPE_VG
	SURFACE_TYPE_GL             SurfaceType = C.CAIRO_SURFACE_TYPE_GL
	SURFACE_TYPE_DRM            SurfaceType = C.CAIRO_SURFACE_TYPE_DRM
	SURFACE_TYPE_TEE            SurfaceType = C.CAIRO_SURFACE_TYPE_TEE
	SURFACE_TYPE_XML            SurfaceType = C.CAIRO_SURFACE_TYPE_XML
	SURFACE_TYPE_SKIA           SurfaceType = C.CAIRO_SURFACE_TYPE_SKIA
	SURFACE_TYPE_SUBSURFACE     SurfaceType = C.CAIRO_SURFACE_TYPE_SUBSURFACE
)

type TextExtents

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

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
t or T : Toggle theme light dark auto
y or Y : Canonical URL