/
line.go
85 lines (68 loc) · 2.35 KB
/
line.go
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package canvas
import (
"image/color"
"math"
"fyne.io/fyne"
)
// Declare conformity with CanvasObject interface
var _ fyne.CanvasObject = (*Line)(nil)
// Line describes a colored line primitive in a Fyne canvas.
// Lines are special as they can have a negative width or height to indicate
// an inverse slope (i.e. slope up vs down).
type Line struct {
Position1 fyne.Position // The current top-left position of the Line
Position2 fyne.Position // The current bottomright position of the Line
Hidden bool // Is this Line currently hidden
StrokeColor color.Color // The line stroke color
StrokeWidth float32 // The stroke width of the line
}
// Size returns the current size of bounding box for this line object
func (l *Line) Size() fyne.Size {
return fyne.NewSize(float32(math.Abs(float64(l.Position2.X)-float64(l.Position1.X))),
float32(math.Abs(float64(l.Position2.Y)-float64(l.Position1.Y))))
}
// Resize sets a new bottom-right position for the line object and it will then be refreshed.
func (l *Line) Resize(size fyne.Size) {
l.Position2 = fyne.NewPos(l.Position1.X+size.Width, l.Position1.Y+size.Height)
Refresh(l)
}
// Position gets the current top-left position of this line object, relative to its parent / canvas
func (l *Line) Position() fyne.Position {
return fyne.NewPos(fyne.Min(l.Position1.X, l.Position2.X), fyne.Min(l.Position1.Y, l.Position2.Y))
}
// Move the line object to a new position, relative to its parent / canvas
func (l *Line) Move(pos fyne.Position) {
size := l.Size()
l.Position1 = pos
l.Position2 = fyne.NewPos(l.Position1.X+size.Width, l.Position1.Y+size.Height)
}
// MinSize for a Line simply returns Size{1, 1} as there is no
// explicit content
func (l *Line) MinSize() fyne.Size {
return fyne.NewSize(1, 1)
}
// Visible returns true if this line// Show will set this circle to be visible is visible, false otherwise
func (l *Line) Visible() bool {
return !l.Hidden
}
// Show will set this line to be visible
func (l *Line) Show() {
l.Hidden = false
l.Refresh()
}
// Hide will set this line to not be visible
func (l *Line) Hide() {
l.Hidden = true
l.Refresh()
}
// Refresh causes this object to be redrawn in it's current state
func (l *Line) Refresh() {
Refresh(l)
}
// NewLine returns a new Line instance
func NewLine(color color.Color) *Line {
return &Line{
StrokeColor: color,
StrokeWidth: 1,
}
}