91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
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package canvas
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import (
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"image/color"
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"math"
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"fyne.io/fyne/v2"
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)
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// Declare conformity with CanvasObject interface
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var _ fyne.CanvasObject = (*Circle)(nil)
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// Circle describes a colored circle primitive in a Fyne canvas
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type Circle struct {
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Position1 fyne.Position // The current top-left position of the Circle
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Position2 fyne.Position // The current bottomright position of the Circle
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Hidden bool // Is this circle currently hidden
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FillColor color.Color // The circle fill color
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StrokeColor color.Color // The circle stroke color
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StrokeWidth float32 // The stroke width of the circle
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}
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// NewCircle returns a new Circle instance
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func NewCircle(color color.Color) *Circle {
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return &Circle{
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FillColor: color,
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}
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}
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// Hide will set this circle to not be visible
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func (c *Circle) Hide() {
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c.Hidden = true
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repaint(c)
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}
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// MinSize for a Circle simply returns Size{1, 1} as there is no
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// explicit content
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func (c *Circle) MinSize() fyne.Size {
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return fyne.NewSize(1, 1)
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}
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// Move the circle object to a new position, relative to its parent / canvas
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func (c *Circle) Move(pos fyne.Position) {
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size := c.Size()
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c.Position1 = pos
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c.Position2 = fyne.NewPos(c.Position1.X+size.Width, c.Position1.Y+size.Height)
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repaint(c)
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}
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// Position gets the current top-left position of this circle object, relative to its parent / canvas
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func (c *Circle) Position() fyne.Position {
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return c.Position1
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}
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// Refresh causes this object to be redrawn with its configured state.
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func (c *Circle) Refresh() {
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Refresh(c)
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}
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// Resize sets a new bottom-right position for the circle object
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// If it has a stroke width this will cause it to Refresh.
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func (c *Circle) Resize(size fyne.Size) {
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if size == c.Size() {
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return
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}
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c.Position2 = fyne.NewPos(c.Position1.X+size.Width, c.Position1.Y+size.Height)
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Refresh(c)
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}
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// Show will set this circle to be visible
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func (c *Circle) Show() {
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c.Hidden = false
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c.Refresh()
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}
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// Size returns the current size of bounding box for this circle object
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func (c *Circle) Size() fyne.Size {
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return fyne.NewSize(float32(math.Abs(float64(c.Position2.X)-float64(c.Position1.X))),
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float32(math.Abs(float64(c.Position2.Y)-float64(c.Position1.Y))))
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}
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// Visible returns true if this circle is visible, false otherwise
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func (c *Circle) Visible() bool {
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return !c.Hidden
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}
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