Documentation
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Index ¶
- Constants
- func ClearFontCache()
- func DrawArc(arc *canvas.Arc, vectorPad float32, scale func(float32) float32) *image.RGBA
- func DrawCircle(circle *canvas.Circle, vectorPad float32, scale func(float32) float32) *image.RGBA
- func DrawLine(line *canvas.Line, vectorPad float32, scale func(float32) float32) *image.RGBA
- func DrawPolygon(polygon *canvas.Polygon, vectorPad float32, scale func(float32) float32) *image.RGBA
- func DrawRectangle(rect *canvas.Rectangle, rWidth, rHeight, vectorPad float32, ...) *image.RGBA
- func DrawString(dst draw.Image, s string, color color.Color, f shaping.Fontmap, ...)
- func GetCornerRadius(perCornerRadius, baseCornerRadius float32) float32
- func GetMaximumCornerRadius(radius, adjacentWidthRadius, adjacentHeightRadius float32, size fyne.Size) float32
- func GetMaximumRadius(size fyne.Size) float32
- func GetMaximumRadiusArc(outerRadius, innerRadius, sweepAngle float32) float32
- func MeasureString(f shaping.Fontmap, s string, textSize float32, style fyne.TextStyle) (size fyne.Size, advance float32)
- func NormalizeArcAngles(startAngle, endAngle float32) (float32, float32)
- func PaintImage(img *canvas.Image, c fyne.Canvas, width, height int) image.Image
- func RenderedTextSize(text string, fontSize float32, style fyne.TextStyle, source fyne.Resource) (size fyne.Size, baseline float32)
- func VectorPad(obj fyne.CanvasObject) float32
- type FontCacheItem
Constants ¶
const (
// DefaultTabWidth is the default width in spaces
DefaultTabWidth = 4
)
Variables ¶
This section is empty.
Functions ¶
func ClearFontCache ¶
func ClearFontCache()
ClearFontCache is used to remove cached fonts in the case that we wish to re-load Font faces
func DrawArc ¶ added in v2.7.0
DrawArc rasterizes the given arc object into an image. The scale function is used to understand how many pixels are required per unit of size. The arc is drawn from StartAngle to EndAngle (in degrees). 0°/360 is top, 90° is right, 180° is bottom, 270° is left 0°/-360 is top, -90° is left, -180° is bottom, -270° is right
func DrawCircle ¶
DrawCircle rasterizes the given circle object into an image. The bounds of the output image will be increased by vectorPad to allow for stroke overflow at the edges. The scale function is used to understand how many pixels are required per unit of size.
func DrawLine ¶
DrawLine rasterizes the given line object into an image. The bounds of the output image will be increased by vectorPad to allow for stroke overflow at the edges. The scale function is used to understand how many pixels are required per unit of size.
func DrawPolygon ¶ added in v2.7.0
func DrawPolygon(polygon *canvas.Polygon, vectorPad float32, scale func(float32) float32) *image.RGBA
DrawPolygon rasterizes the given regular polygon object into an image. The bounds of the output image will be increased by vectorPad to allow for stroke overflow at the edges. The scale function is used to understand how many pixels are required per unit of size.
func DrawRectangle ¶
func DrawRectangle(rect *canvas.Rectangle, rWidth, rHeight, vectorPad float32, scale func(float32) float32) *image.RGBA
DrawRectangle rasterizes the given rectangle object with stroke border into an image. The bounds of the output image will be increased by vectorPad to allow for stroke overflow at the edges. The scale function is used to understand how many pixels are required per unit of size.
func DrawString ¶ added in v2.2.0
func DrawString(dst draw.Image, s string, color color.Color, f shaping.Fontmap, fontSize, scale float32, style fyne.TextStyle)
DrawString draws a string into an image.
func GetCornerRadius ¶ added in v2.7.0
GetCornerRadius returns the effective corner radius for a rectangle or square corner. If the specific corner radius (perCornerRadius) is zero, it falls back to the baseCornerRadius. Otherwise, it uses the specific corner radius provided.
This allows for per-corner customization while maintaining a default overall radius.
func GetMaximumCornerRadius ¶ added in v2.7.0
func GetMaximumCornerRadius(radius, adjacentWidthRadius, adjacentHeightRadius float32, size fyne.Size) float32
GetMaximumCornerRadius returns the maximum possible corner radius for an individual corner, considering the specified corner radius, the radii of adjacent corners, and the maximum radii allowed for the width and height of the shape. Corner radius may utilize unused capacity from adjacent corners with radius smaller than maximum value so this corner can grow up to double the maximum radius of the smaller dimension (width or height) without causing overlaps.
This is typically used for drawing circular corners in rectangles or squares with different corner radii.
func GetMaximumRadius ¶ added in v2.7.0
GetMaximumRadius returns the maximum possible corner radius that fits within the given size. It calculates half of the smaller dimension (width or height) of the provided fyne.Size.
This is typically used for drawing circular corners in rectangles, circles or squares with the same radius for all corners.
func GetMaximumRadiusArc ¶ added in v2.7.0
GetMaximumRadiusArc returns the maximum possible corner radius for an arc segment based on the outer radius, inner radius, and sweep angle in degrees. It calculates half of the smaller dimension (thickness or effective length) of the provided arc parameters
func MeasureString ¶ added in v2.1.0
func MeasureString(f shaping.Fontmap, s string, textSize float32, style fyne.TextStyle) (size fyne.Size, advance float32)
MeasureString returns how far dot would advance by drawing s with f. Tabs are translated into a dot location change.
func NormalizeArcAngles ¶ added in v2.7.0
NormalizeArcAngles adjusts the given start and end angles for arc drawing. It converts the angles from the Unit circle coordinate system (where 0 degrees is along the positive X-axis) to the coordinate system used by the painter, where 0 degrees is at the top (12 o'clock position). The function also reverses the direction: positive is clockwise, negative is counter-clockwise
func PaintImage ¶
PaintImage renders a given fyne Image to a Go standard image If a fyne.Canvas is given and the image’s fill mode is “fill original” the image’s min size has to fit its original size. If it doesn’t, PaintImage does not paint the image but adjusts its min size. The image will then be painted on the next frame because of the min size change.
func RenderedTextSize ¶
func RenderedTextSize(text string, fontSize float32, style fyne.TextStyle, source fyne.Resource) (size fyne.Size, baseline float32)
RenderedTextSize looks up how big a string would be if drawn on screen. It also returns the distance from top to the text baseline.
func VectorPad ¶
func VectorPad(obj fyne.CanvasObject) float32
VectorPad returns the number of additional points that should be added around a texture. This is to accommodate overflow caused by stroke and line endings etc. THe result is in fyne.Size type coordinates and should be scaled for output.
Types ¶
type FontCacheItem ¶ added in v2.4.0
func CachedFontFace ¶
func CachedFontFace(style fyne.TextStyle, source fyne.Resource, o fyne.CanvasObject) *FontCacheItem
CachedFontFace returns a Font face held in memory. These are loaded from the current theme.
Source Files
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