mirror of
https://github.com/charmbracelet/harmonica.git
synced 2026-07-19 10:09:33 -06:00
Just use pixel/pixelgl directly for the visual example
This commit is contained in:
Christian Rocha
parent
c6198b0130
commit
d7531b76d7
@ -1,136 +0,0 @@
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package main
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import (
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"time"
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"github.com/charmbracelet/harmonica"
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"github.com/h8gi/canvas"
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)
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const (
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canvasWidth = 1024
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canvasHeight = 768
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fps = 60
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circleRadius = 100
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bgColor = "#111111"
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idleTimeout = time.Second * 5
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)
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type State int
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const (
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unstarted State = iota
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running
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timeout
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)
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func main() {
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var (
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circ Circle
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state State
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lastClick time.Time
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)
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c := canvas.NewCanvas(&canvas.CanvasConfig{
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Width: canvasWidth,
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Height: canvasHeight,
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FrameRate: fps,
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Title: "Harmonica",
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})
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c.Draw(func(ctx *canvas.Context) {
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ctx.Clear()
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ctx.SetHexColor(bgColor)
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switch state {
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case unstarted:
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if ctx.IsMouseDragged {
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const frequency = 0.8
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const damping = 1.0
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circ = Circle{
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// Setup a new spring.
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spring: harmonica.NewSpring(harmonica.FPS(fps), frequency, damping),
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// Set target radius.
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Radius: circleRadius,
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}
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// Set starting position.
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circ.SetPos(ctx.Mouse.X, ctx.Mouse.Y)
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lastClick = time.Now()
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state = running
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}
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case running:
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if ctx.IsMouseDragged {
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lastClick = time.Now()
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if circ.Hidden {
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circ.SetPos(ctx.Mouse.X, ctx.Mouse.Y)
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circ.Hidden = false
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}
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// Update targets for our spring animation.
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circ.X = ctx.Mouse.X
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circ.Y = ctx.Mouse.Y
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circ.Radius = circleRadius
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}
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circ.Draw(ctx)
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if time.Now().After(lastClick.Add(idleTimeout)) {
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state = timeout
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}
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case timeout:
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circ.Radius = 0
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circ.Draw(ctx)
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if circ.rad == 0 {
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state = running
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lastClick = time.Now()
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}
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}
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})
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}
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type Circle struct {
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// Target values. This is what the spring will use as an equilibrium to
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// animate towards.
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X, Y, Radius float64
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x, xVel float64
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y, yVel float64
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rad, radVel float64
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spring harmonica.Spring
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Hidden bool
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}
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func (c *Circle) SetPos(x, y float64) {
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c.x = x
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c.y = y
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c.Hidden = false
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}
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func (c *Circle) Draw(ctx *canvas.Context) {
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// Update position and radius.
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c.spring.Update(&c.x, &c.xVel, c.X)
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c.spring.Update(&c.y, &c.yVel, c.Y)
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c.spring.Update(&c.rad, &c.radVel, c.Radius)
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if c.rad < 0 {
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c.rad = 0
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c.radVel = 0
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c.Hidden = true
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}
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const color = "#f1f1f1"
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ctx.Push()
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ctx.DrawCircle(c.x, c.y, c.rad)
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ctx.SetHexColor(color)
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ctx.Fill()
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ctx.Pop()
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}
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@ -5,12 +5,10 @@ go 1.16
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replace github.com/charmbracelet/harmonica => ../
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require (
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github.com/charmbracelet/bubbletea v0.14.1 // indirect
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github.com/charmbracelet/harmonica v0.0.0-20210709144143-16876a63b30d // indirect
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github.com/charmbracelet/lipgloss v0.3.0 // indirect
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github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f // indirect
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github.com/h8gi/canvas v0.0.0-20200710004640-a6361a06ab49
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github.com/pkg/term v0.0.0-20200520122047-c3ffed290a03 // indirect
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golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee // indirect
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github.com/charmbracelet/bubbletea v0.14.1
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github.com/charmbracelet/harmonica v0.0.0-20210709144143-16876a63b30d
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github.com/charmbracelet/lipgloss v0.3.0
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github.com/faiface/pixel v0.10.0
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github.com/fogleman/gg v1.3.0
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golang.org/x/image v0.0.0-20190523035834-f03afa92d3ff
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)
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@ -4,30 +4,28 @@ github.com/charmbracelet/lipgloss v0.3.0 h1:5MysOD6sHr4RP4jkZNWGVIul5GKoOsP12Ngb
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github.com/charmbracelet/lipgloss v0.3.0/go.mod h1:VkhdBS2eNAmRkTwRKLJCFhCOVkjntMusBDxv7TXahuk=
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github.com/containerd/console v1.0.1 h1:u7SFAJyRqWcG6ogaMAx3KjSTy1e3hT9QxqX7Jco7dRc=
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github.com/containerd/console v1.0.1/go.mod h1:XUsP6YE/mKtz6bxc+I8UiKKTP04qjQL4qcS3XoQ5xkw=
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github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/faiface/glhf v0.0.0-20181018222622-82a6317ac380 h1:FvZ0mIGh6b3kOITxUnxS3tLZMh7yEoHo75v3/AgUqg0=
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github.com/faiface/glhf v0.0.0-20181018222622-82a6317ac380/go.mod h1:zqnPFFIuYFFxl7uH2gYByJwIVKG7fRqlqQCbzAnHs9g=
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github.com/faiface/mainthread v0.0.0-20171120011319-8b78f0a41ae3 h1:baVdMKlASEHrj19iqjARrPbaRisD7EuZEVJj6ZMLl1Q=
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github.com/faiface/mainthread v0.0.0-20171120011319-8b78f0a41ae3/go.mod h1:VEPNJUlxl5KdWjDvz6Q1l+rJlxF2i6xqDeGuGAxa87M=
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github.com/faiface/pixel v0.8.0 h1:phOHW6ixfMAKRamjnvhI6FFI2VRyPEq7+LmmkDGXB/4=
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github.com/faiface/pixel v0.8.0/go.mod h1:CEUU/s9E82Kqp01Boj1O67KnBskqiLghANqvUJGgDAM=
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github.com/faiface/pixel v0.10.0 h1:EHm3ZdQw2Ck4y51cZqFfqQpwLqNHOoXwbNEc9Dijql0=
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github.com/faiface/pixel v0.10.0/go.mod h1:lU0YYcW77vL0F1CG8oX51GXurymL45MXd57otHNLK7A=
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github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
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github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
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github.com/go-gl/gl v0.0.0-20190320180904-bf2b1f2f34d7 h1:SCYMcCJ89LjRGwEa0tRluNRiMjZHalQZrVrvTbPh+qw=
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github.com/go-gl/gl v0.0.0-20190320180904-bf2b1f2f34d7/go.mod h1:482civXOzJJCPzJ4ZOX/pwvXBWSnzD4OKMdH4ClKGbk=
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github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1 h1:QbL/5oDUmRBzO9/Z7Seo6zf912W/a6Sr4Eu0G/3Jho0=
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github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72 h1:b+9H1GAsx5RsjvDFLoS5zkNBzIQMuVKUYQDmxU3N5XE=
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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github.com/go-gl/mathgl v0.0.0-20190416160123-c4601bc793c7 h1:THttjeRn1iiz69E875U6gAik8KTWk/JYAHoSVpUxBBI=
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github.com/go-gl/mathgl v0.0.0-20190416160123-c4601bc793c7/go.mod h1:yhpkQzEiH9yPyxDUGzkmgScbaBVlhC06qodikEM0ZwQ=
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github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
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github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
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github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f/go.mod h1:nOFQdrUlIlx6M6ODdSpBj1NVA+VgLC6kmw60mkw34H4=
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github.com/h8gi/canvas v0.0.0-20200710004640-a6361a06ab49 h1:svddC2dRqy+Y1zGH4+AvvCFZLKuPhAfEvlgYSNP4lcg=
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github.com/h8gi/canvas v0.0.0-20200710004640-a6361a06ab49/go.mod h1:7iSUKfOcA+GiWc+LpxXggMogUFIo8pm1FZcYTUmL3YY=
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github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
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github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
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github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
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github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
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github.com/mattn/go-runewidth v0.0.10 h1:CoZ3S2P7pvtP45xOtBw+/mDL2z0RKI576gSkzRRpdGg=
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github.com/mattn/go-runewidth v0.0.10/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
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github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
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github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
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@ -35,25 +33,22 @@ github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68 h1:y1p/ycavWjGT9Fn
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github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68/go.mod h1:Xk+z4oIWdQqJzsxyjgl3P22oYZnHdZ8FFTHAQQt5BMQ=
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github.com/muesli/termenv v0.8.1 h1:9q230czSP3DHVpkaPDXGp0TOfAwyjyYwXlUCQxQSaBk=
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github.com/muesli/termenv v0.8.1/go.mod h1:kzt/D/4a88RoheZmwfqorY3A+tnsSMA9HJC/fQSFKo0=
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github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
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github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
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github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
|
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github.com/pkg/term v0.0.0-20200520122047-c3ffed290a03/go.mod h1:Z9+Ul5bCbBKnbCvdOWbLqTHhJiYV414CURZJba6L8qA=
|
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github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
|
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
|
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github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
|
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github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
|
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github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
|
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
|
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golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
|
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
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github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
|
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github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
|
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golang.org/x/image v0.0.0-20190321063152-3fc05d484e9f/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
|
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golang.org/x/image v0.0.0-20190523035834-f03afa92d3ff h1:+2zgJKVDVAz/BWSsuniCmU1kLCjL88Z8/kv39xCI9NQ=
|
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golang.org/x/image v0.0.0-20190523035834-f03afa92d3ff/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
|
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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
|
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golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
|
||||
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20200916030750-2334cc1a136f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
|
||||
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 h1:myAQVi0cGEoqQVR5POX+8RR2mrocKqNN1hmeMqhX27k=
|
||||
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
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|
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BIN
examples/pixel/JetBrainsMono-Regular.ttf
Normal file
BIN
examples/pixel/JetBrainsMono-Regular.ttf
Normal file
Binary file not shown.
332
examples/pixel/main.go
Normal file
332
examples/pixel/main.go
Normal file
@ -0,0 +1,332 @@
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package main
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|
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import (
|
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"fmt"
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"image"
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"math"
|
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"math/rand"
|
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"time"
|
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|
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"github.com/charmbracelet/harmonica"
|
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"github.com/faiface/pixel"
|
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"github.com/faiface/pixel/pixelgl"
|
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"github.com/fogleman/gg"
|
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"golang.org/x/image/font"
|
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)
|
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|
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const (
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width = 1024
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height = 768
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fontFile = "JetBrainsMono-Regular.ttf"
|
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idleTimeout = time.Second * 4
|
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)
|
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|
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func main() {
|
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rand.Seed(time.Now().UnixNano())
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pixelgl.Run(Game{}.Run)
|
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}
|
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|
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type Game struct {
|
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deltaTime float64
|
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frequency float64
|
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damping float64
|
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win *pixelgl.Window
|
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bgColor string
|
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textColor string
|
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spriteColor string
|
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shift bool
|
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font font.Face
|
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sprite *Sprite
|
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lastClick time.Time
|
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dirty bool
|
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showHelp bool
|
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}
|
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|
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func (g Game) Size() (width, height float64) {
|
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return g.win.Bounds().W(), g.win.Bounds().H()
|
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}
|
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|
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func (g Game) MousePosition() (x, y float64) {
|
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return g.win.MousePosition().X, g.win.MousePosition().Y
|
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}
|
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|
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func (g Game) Run() {
|
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g.frequency = 2.0
|
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g.damping = 2.0
|
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g.bgColor = "#575BD8"
|
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g.textColor = "#827EFF"
|
||||
g.spriteColor = "#FFFDF5"
|
||||
g.showHelp = true
|
||||
|
||||
var err error
|
||||
if g.font, err = gg.LoadFontFace(fontFile, 24); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
cfg := pixelgl.WindowConfig{
|
||||
Title: "Harmonica Example",
|
||||
Bounds: pixel.R(0, 0, width, height),
|
||||
VSync: true,
|
||||
Resizable: false,
|
||||
}
|
||||
|
||||
if g.win, err = pixelgl.NewWindow(cfg); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
last := time.Now()
|
||||
for !g.win.Closed() {
|
||||
w, h := g.Size()
|
||||
|
||||
// Get delta time
|
||||
g.deltaTime = time.Since(last).Seconds()
|
||||
last = time.Now()
|
||||
|
||||
g.Update()
|
||||
|
||||
// Use fogleman/gg to render everything
|
||||
ctx := gg.NewContext(int(w), int(h))
|
||||
g.Draw(ctx)
|
||||
canvas := g.win.Canvas()
|
||||
canvas.SetPixels(ctx.Image().(*image.RGBA).Pix)
|
||||
|
||||
// Render
|
||||
g.win.Update()
|
||||
}
|
||||
}
|
||||
|
||||
func (g *Game) Update() {
|
||||
pressed := g.win.JustPressed
|
||||
released := g.win.JustReleased
|
||||
|
||||
// Handle shift key
|
||||
switch {
|
||||
case pressed(pixelgl.KeyLeftShift), pressed(pixelgl.KeyRightShift):
|
||||
g.shift = true
|
||||
case released(pixelgl.KeyLeftShift), released(pixelgl.KeyRightShift):
|
||||
g.shift = false
|
||||
}
|
||||
|
||||
adjustFreq, adjustDamp := 0.0, 0.0
|
||||
|
||||
// Handle arrow keys to adjust frequency and damping
|
||||
switch {
|
||||
case released(pixelgl.KeyLeft):
|
||||
adjustFreq = -0.1
|
||||
case released(pixelgl.KeyRight):
|
||||
adjustFreq = 0.1
|
||||
case released(pixelgl.KeyUp):
|
||||
adjustDamp = 0.1
|
||||
case released(pixelgl.KeyDown):
|
||||
adjustDamp = -0.1
|
||||
case released(pixelgl.KeySpace):
|
||||
g.showHelp = !g.showHelp
|
||||
}
|
||||
|
||||
if g.shift {
|
||||
adjustDamp *= 10
|
||||
adjustFreq *= 10
|
||||
}
|
||||
|
||||
if adjustFreq != 0 || adjustDamp != 0 {
|
||||
g.frequency = math.Max(0, g.frequency+adjustFreq)
|
||||
g.damping = math.Max(0, g.damping+adjustDamp)
|
||||
g.dirty = true
|
||||
}
|
||||
|
||||
if time.Now().After(g.lastClick.Add(idleTimeout)) {
|
||||
if g.sprite != nil {
|
||||
g.sprite.Hide()
|
||||
}
|
||||
}
|
||||
|
||||
if released(pixelgl.MouseButtonLeft) {
|
||||
s := g.sprite
|
||||
|
||||
if s == nil {
|
||||
g.sprite = NewSprite(g)
|
||||
} else {
|
||||
x, y := g.MousePosition()
|
||||
s.TargetX = x
|
||||
s.TargetY = y
|
||||
|
||||
switch s.State() {
|
||||
case hiding, gone:
|
||||
s.Show()
|
||||
}
|
||||
}
|
||||
|
||||
g.dirty = false
|
||||
g.lastClick = time.Now()
|
||||
}
|
||||
|
||||
// Sprite
|
||||
if g.sprite != nil {
|
||||
g.sprite.Update()
|
||||
}
|
||||
|
||||
g.dirty = false
|
||||
}
|
||||
|
||||
func (g Game) Draw(ctx *gg.Context) {
|
||||
w, h := g.Size()
|
||||
|
||||
// BG
|
||||
ctx.SetHexColor(g.bgColor)
|
||||
ctx.DrawRectangle(0, 0, w, h)
|
||||
ctx.Fill()
|
||||
|
||||
// Help text
|
||||
if g.showHelp {
|
||||
// For some reason our text renders upside down and backwards. Apply a
|
||||
// matrix to fix it.
|
||||
ctx.ScaleAbout(-1, 1, w/2, h/2)
|
||||
ctx.RotateAbout(math.Pi, w/2, h/2)
|
||||
|
||||
// Instructional text
|
||||
ctx.Push()
|
||||
ctx.SetHexColor(g.textColor)
|
||||
ctx.SetFontFace(g.font)
|
||||
ctx.DrawStringAnchored("Click!", w/2, h/2, 0.5, 0.5)
|
||||
ctx.Fill()
|
||||
ctx.Pop()
|
||||
|
||||
// Status
|
||||
str := fmt.Sprintf(
|
||||
"Frequency: %.1f (←/→: adjust) • Damping: %.1f (↑/↓: adjust)",
|
||||
g.frequency, g.damping,
|
||||
)
|
||||
ctx.Push()
|
||||
ctx.SetHexColor(g.textColor)
|
||||
ctx.SetFontFace(g.font)
|
||||
ctx.DrawStringAnchored(str, w/2, h-34, 0.5, 0)
|
||||
ctx.Fill()
|
||||
ctx.Pop()
|
||||
|
||||
// Reset matrix
|
||||
ctx.Identity()
|
||||
}
|
||||
|
||||
// Draw sprites
|
||||
if g.sprite != nil {
|
||||
g.sprite.Draw(ctx)
|
||||
}
|
||||
}
|
||||
|
||||
type SpriteState int
|
||||
|
||||
const (
|
||||
moving SpriteState = iota
|
||||
stopped
|
||||
hiding
|
||||
gone
|
||||
)
|
||||
|
||||
type Sprite struct {
|
||||
TargetX, TargetY, TargetRadius float64
|
||||
X, xVel float64
|
||||
Y, yVel float64
|
||||
radius, radiusVel float64
|
||||
color string
|
||||
spring harmonica.Spring
|
||||
game *Game
|
||||
}
|
||||
|
||||
func NewSprite(g *Game) *Sprite {
|
||||
mouseX, mouseY := g.MousePosition()
|
||||
|
||||
s := &Sprite{
|
||||
X: mouseX,
|
||||
Y: mouseY,
|
||||
TargetX: mouseX,
|
||||
TargetY: mouseY,
|
||||
radius: 0.1,
|
||||
color: g.spriteColor,
|
||||
game: g,
|
||||
}
|
||||
s.computeSpring()
|
||||
s.randomRadius()
|
||||
|
||||
return s
|
||||
}
|
||||
|
||||
func (s *Sprite) Update() {
|
||||
if s.State() == gone {
|
||||
return
|
||||
}
|
||||
|
||||
g := s.game
|
||||
|
||||
if g.dirty {
|
||||
// Recompute spring coefficients since our frequency or damping has
|
||||
// changed.
|
||||
s.computeSpring()
|
||||
}
|
||||
|
||||
// Calculate positions based on our spring
|
||||
s.spring.Update(&s.X, &s.xVel, s.TargetX)
|
||||
s.spring.Update(&s.Y, &s.yVel, s.TargetY)
|
||||
s.spring.Update(&s.radius, &s.radiusVel, s.TargetRadius)
|
||||
}
|
||||
|
||||
func (s Sprite) Draw(ctx *gg.Context) {
|
||||
if s.State() == gone {
|
||||
return
|
||||
}
|
||||
|
||||
ctx.Push()
|
||||
ctx.DrawCircle(s.X, s.Y, s.radius)
|
||||
ctx.SetHexColor(s.color)
|
||||
ctx.Fill()
|
||||
ctx.Pop()
|
||||
}
|
||||
|
||||
func (s Sprite) State() SpriteState {
|
||||
const precision = 2
|
||||
x := roundFloat(s.X, precision)
|
||||
tX := roundFloat(s.TargetX, precision)
|
||||
y := roundFloat(s.Y, precision)
|
||||
tY := roundFloat(s.TargetY, precision)
|
||||
r := roundFloat(s.radius, precision)
|
||||
tR := roundFloat(s.TargetRadius, precision)
|
||||
|
||||
if r == 0.0 {
|
||||
return gone
|
||||
}
|
||||
if s.TargetRadius == 0 {
|
||||
return hiding
|
||||
}
|
||||
if x == tX && y == tY && r == tR {
|
||||
return stopped
|
||||
}
|
||||
return moving
|
||||
}
|
||||
|
||||
func (s *Sprite) computeSpring() {
|
||||
// Calculate spring coefficients
|
||||
s.spring = harmonica.NewSpring(s.game.deltaTime, s.game.frequency, s.game.damping)
|
||||
}
|
||||
|
||||
func (s *Sprite) randomRadius() {
|
||||
s.TargetRadius = rand.Float64()*100.0 + 100.0
|
||||
}
|
||||
|
||||
func (s *Sprite) Show() {
|
||||
s.X, s.Y = s.game.MousePosition()
|
||||
if s.radius < 0.1 {
|
||||
s.radius = 0.1
|
||||
}
|
||||
s.computeSpring()
|
||||
s.randomRadius()
|
||||
}
|
||||
|
||||
func (s *Sprite) Hide() {
|
||||
// Fixed frequency and damping when hiding
|
||||
s.spring = harmonica.NewSpring(s.game.deltaTime, 3.0, 8.0)
|
||||
s.TargetRadius = 0
|
||||
}
|
||||
|
||||
func roundFloat(input float64, decimalPlaces int) float64 {
|
||||
pow := math.Pow(10, float64(decimalPlaces))
|
||||
return math.Round(pow*input) / pow
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user