ebiten/internal/ui/input.go

// Copyright 2015 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package ui

import (
	glfw "github.com/go-gl/glfw3"
	"math"
)

type Key int

const (
	KeyUp Key = iota
	KeyDown
	KeyLeft
	KeyRight
	KeySpace
	KeyMax
)

type MouseButton int

const (
	MouseButtonLeft MouseButton = iota
	MouseButtonRight
	MouseButtonMiddle
	MouseButtonMax
)

type Input struct {
	keyPressed         [KeyMax]bool
	mouseButtonPressed [MouseButtonMax]bool
	cursorX            int
	cursorY            int
}

func (i *Input) IsKeyPressed(key Key) bool {
	return i.keyPressed[key]
}

func (i *Input) IsMouseButtonPressed(button MouseButton) bool {
	return i.mouseButtonPressed[button]
}

func (i *Input) CursorPosition() (x, y int) {
	return i.cursorX, i.cursorY
}

var glfwKeyCodeToKey = map[glfw.Key]Key{
	glfw.KeySpace: KeySpace,
	glfw.KeyLeft:  KeyLeft,
	glfw.KeyRight: KeyRight,
	glfw.KeyUp:    KeyUp,
	glfw.KeyDown:  KeyDown,
}

func (i *Input) update(window *glfw.Window, scale int) {
	for g, u := range glfwKeyCodeToKey {
		i.keyPressed[u] = window.GetKey(g) == glfw.Press
	}
	for b := MouseButtonLeft; b < MouseButtonMax; b++ {
		i.mouseButtonPressed[b] = window.GetMouseButton(glfw.MouseButton(b)) == glfw.Press
	}
	x, y := window.GetCursorPosition()
	i.cursorX = int(math.Floor(x)) / scale
	i.cursorY = int(math.Floor(y)) / scale
}