mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
135 lines
3.3 KiB
Go
135 lines
3.3 KiB
Go
// Copyright 2015 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build js
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package ui
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import (
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"github.com/gopherjs/gopherjs/js"
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"github.com/gopherjs/webgl"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"strconv"
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"time"
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)
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var canvas js.Object
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var context *opengl.Context
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func Use(f func(*opengl.Context)) {
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f(context)
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}
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func DoEvents() {
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time.Sleep(0)
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}
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func Terminate() {
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// Do nothing.
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}
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func IsClosed() bool {
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return false
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}
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func SwapBuffers() {
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// Do nothing.
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}
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func init() {
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ch := make(chan struct{})
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js.Global.Get("window").Set("onload", func() {
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close(ch)
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})
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<-ch
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doc := js.Global.Get("document")
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canvas = doc.Call("createElement", "canvas")
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canvas.Set("width", 16)
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canvas.Set("height", 16)
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doc.Get("body").Call("appendChild", canvas)
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htmlStyle := doc.Get("documentElement").Get("style")
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htmlStyle.Set("height", "100%")
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htmlStyle.Set("margin", "0")
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htmlStyle.Set("padding", "0")
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bodyStyle := doc.Get("body").Get("style")
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bodyStyle.Set("backgroundColor", "#000")
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bodyStyle.Set("position", "relative")
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bodyStyle.Set("height", "100%")
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bodyStyle.Set("margin", "0")
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bodyStyle.Set("padding", "0")
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canvasStyle := canvas.Get("style")
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canvasStyle.Set("position", "absolute")
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webglContext, err := webgl.NewContext(canvas, &webgl.ContextAttributes{
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Alpha: true,
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PremultipliedAlpha: true,
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})
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if err != nil {
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panic(err)
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}
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context = opengl.NewContext(webglContext)
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// Make the canvas focusable.
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canvas.Call("setAttribute", "tabindex", 1)
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canvas.Get("style").Set("outline", "none")
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canvas.Set("onkeydown", func(e js.Object) {
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code := e.Get("keyCode").Int()
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currentInput.keyDown(code)
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button := e.Get("button").Int()
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currentInput.mouseDown(button)
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})
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canvas.Set("onkeyup", func(e js.Object) {
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code := e.Get("keyCode").Int()
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currentInput.keyUp(code)
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button := e.Get("button").Int()
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currentInput.mouseUp(button)
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})
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canvas.Set("onmousedown", func(e js.Object) {
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button := e.Get("button").Int()
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currentInput.mouseDown(button)
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})
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canvas.Set("onmouseup", func(e js.Object) {
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button := e.Get("button").Int()
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currentInput.mouseUp(button)
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})
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canvas.Set("oncontextmenu", func(e js.Object) bool {
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return false
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})
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}
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func Start(width, height, scale int, title string) (actualScale int, err error) {
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doc := js.Global.Get("document")
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doc.Set("title", title)
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canvas.Set("width", width*scale)
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canvas.Set("height", height*scale)
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canvasStyle := canvas.Get("style")
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canvasStyle.Set("left", "calc(50% - "+strconv.Itoa(width*scale/2)+"px)")
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canvasStyle.Set("top", "calc(50% - "+strconv.Itoa(height*scale/2)+"px)")
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canvas.Set("onmousemove", func(e js.Object) {
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rect := canvas.Call("getBoundingClientRect")
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x, y := e.Get("clientX").Int(), e.Get("clientY").Int()
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x -= rect.Get("left").Int()
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y -= rect.Get("top").Int()
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currentInput.mouseMove(x/scale, y/scale)
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})
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return scale, nil
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}
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