stone/examples/draw/main.go

package main

import "os"
import "image"
import _ "image/png"
import "git.tebibyte.media/sashakoshka/stone"
import _ "git.tebibyte.media/sashakoshka/stone/backends/x"

var application = &stone.Application { }
var mousePressed bool

func main () {
	application.SetTitle("drawing canvas")
	application.SetSize(32, 16)

	iconFile16, err := os.Open("assets/scaffold16.png")
	if err != nil { panic(err) }
	icon16, _, err := image.Decode(iconFile16)
	if err != nil { panic(err) }
	iconFile16.Close()
	iconFile32, err := os.Open("assets/scaffold32.png")
	if err != nil { panic(err) }
	icon32, _, err := image.Decode(iconFile32)
	if err != nil { panic(err) }
	iconFile16.Close()
	
	application.SetIcon([]image.Image { icon16, icon32 })
	
	application.OnPress(onPress)
	application.OnRelease(onRelease)
	application.OnMouseMove(onMouseMove)
	
	err = application.Run()
	if err != nil { panic(err) }
}

func onPress (button stone.Button, modifiers stone.Modifiers) {
	if button == stone.MouseButtonLeft {
		mousePressed = true
		application.SetRune(0, 0, '+')
		application.Draw()
	}
}

func onRelease (button stone.Button) {
	if button == stone.MouseButtonLeft {
		mousePressed = false
		application.SetRune(0, 0, 0)
		application.Draw()
	}
}

func onMouseMove (x, y int) {
	if mousePressed {
		application.SetRune(x, y, '#')
		application.Draw()
	}
}