Gradient
The last canvas primitive type is Gradient, available as
canvas.LinearGradient and canvas.RadialGradient which is used
to draw a gradient from one colour to another in various patterns.
You can create gradients using NewHorizontalGradient(),
NewVerticalGradient() or NewRadialGradient().
To create a gradient you need a start and end colour - every colour
in between is calculated by the canvas. In this example we use
color.Transparent to show how a gradient (or any other type) could
use an alpha value to be semi-transparent over the content behind.
package main
import (
"image/color"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/app"
"fyne.io/fyne/v2/canvas"
)
func main() {
myApp := app.New()
w := myApp.NewWindow("Gradient")
gradient := canvas.NewHorizontalGradient(color.White, color.Transparent)
//gradient := canvas.NewRadialGradient(color.White, color.Transparent)
w.SetContent(gradient)
w.Resize(fyne.NewSize(100, 100))
w.ShowAndRun()
}