/
main.go
94 lines (74 loc) · 1.89 KB
/
main.go
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// SPDX-License-Identifier: Unlicense OR MIT
package main
import (
"time"
"gioui.org/f32"
"gioui.org/io/pointer"
"gioui.org/layout"
"gioui.org/op"
"gioui.org/op/paint"
"gioui.org/widget/material"
"github.com/egonelbre/diy-visuals-gio/internal/g"
"github.com/egonelbre/diy-visuals-gio/internal/qapp"
)
var Theme = material.NewTheme()
var Start = time.Now()
var Mouse f32.Point
func main() {
qapp.Layout(func(gtx layout.Context) layout.Dimensions {
screenSize := layout.FPt(gtx.Constraints.Max)
op.InvalidateOp{}.Add(gtx.Ops)
pointer.InputOp{
Tag: &Mouse,
Types: pointer.Press | pointer.Drag | pointer.Release | pointer.Move,
}.Add(gtx.Ops)
for _, ev := range gtx.Events(&Mouse) {
switch ev := ev.(type) {
case pointer.Event:
Mouse = ev.Position
}
}
millis := float32(gtx.Now.Sub(Start).Seconds())
_ = millis
defer op.Affine(
f32.Affine2D{}.
Scale(f32.Point{}, f32.Pt(1, -1)).
Offset(f32.Pt(
screenSize.X/2,
screenSize.Y,
)),
).Push(gtx.Ops).Pop()
relativeMouse := Mouse
relativeMouse.X /= screenSize.X
relativeMouse.Y /= screenSize.Y
relativeMouse = relativeMouse.Sub(f32.Pt(0.5, 0.5)).Mul(2)
Tree(gtx, 7, relativeMouse.X, relativeMouse.Y)
return layout.Dimensions{}
})
}
func Tree(gtx layout.Context, level int, rotateLeft, rotateRight float32) {
level--
if level < 0 {
return
}
height := float32(400)
paint.FillShape(gtx.Ops, g.Black,
g.FillRect(gtx.Ops, -10, 0, 20, height))
defer op.Affine(
f32.Affine2D{}.
Scale(f32.Point{}, f32.Pt(0.7, 0.7)).
Offset(f32.Pt(0, height)),
).Push(gtx.Ops).Pop()
func() {
defer op.Affine(
f32.Affine2D{}.Rotate(f32.Pt(0, 0), -rotateLeft),
).Push(gtx.Ops).Pop()
Tree(gtx, level, rotateLeft, rotateRight)
}()
func() {
defer op.Affine(
f32.Affine2D{}.Rotate(f32.Pt(0, 0), rotateRight),
).Push(gtx.Ops).Pop()
Tree(gtx, level, rotateLeft, rotateRight)
}()
}