mirror of
https://github.com/hajimehoshi/ebiten.git
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132 lines
3.3 KiB
Go
132 lines
3.3 KiB
Go
// Copyright 2024 The Ebitengine Authors
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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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// Mascot is a desktop mascot on cross platforms.
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// This is inspired by mattn's gopher (https://github.com/mattn/gopher).
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package main
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import (
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"bytes"
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"image"
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_ "image/png"
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"log"
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"github.com/hajimehoshi/ebiten/v2"
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rmascot "github.com/hajimehoshi/ebiten/v2/examples/resources/images/mascot"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
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)
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const (
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width = 200
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height = 200
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)
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var (
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gopher1 *ebiten.Image
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gopher2 *ebiten.Image
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gopher3 *ebiten.Image
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)
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func init() {
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// Decode an image from the image file's byte slice.
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img1, _, err := image.Decode(bytes.NewReader(rmascot.Out01_png))
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if err != nil {
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log.Fatal(err)
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}
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gopher1 = ebiten.NewImageFromImage(img1)
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img2, _, err := image.Decode(bytes.NewReader(rmascot.Out02_png))
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if err != nil {
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log.Fatal(err)
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}
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gopher2 = ebiten.NewImageFromImage(img2)
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img3, _, err := image.Decode(bytes.NewReader(rmascot.Out03_png))
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if err != nil {
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log.Fatal(err)
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}
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gopher3 = ebiten.NewImageFromImage(img3)
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}
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type mascot struct {
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count int
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dragging bool
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dragStartWindowX int
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dragStartWindowY int
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dragStartCursorX int
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dragStartCursorY int
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cursorToWindowX float64
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cursorToWindowY float64
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}
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func (m *mascot) Layout(outsideWidth, outsideHeight int) (int, int) {
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// The cursor position is in a "logical" coordinate, which is determined by the game width and height.
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// Calculate the factors to convert a cursor position to a window position.
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m.cursorToWindowX = float64(outsideWidth) / float64(width)
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m.cursorToWindowY = float64(outsideHeight) / float64(height)
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return width, height
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}
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func (m *mascot) Update() error {
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if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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m.dragging = false
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}
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if !m.dragging && inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
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m.dragging = true
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m.dragStartWindowX, m.dragStartWindowY = ebiten.WindowPosition()
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m.dragStartCursorX, m.dragStartCursorY = ebiten.CursorPosition()
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}
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if m.dragging {
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// Move the window only by the delta of the cursor.
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cx, cy := ebiten.CursorPosition()
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dx := int(float64(cx-m.dragStartCursorX) * m.cursorToWindowX)
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dy := int(float64(cy-m.dragStartCursorY) * m.cursorToWindowY)
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wx, wy := ebiten.WindowPosition()
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ebiten.SetWindowPosition(wx+dx, wy+dy)
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m.count++
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}
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return nil
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}
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func (m *mascot) Draw(screen *ebiten.Image) {
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img := gopher1
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if m.dragging {
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switch (m.count / 3) % 4 {
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case 0:
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img = gopher1
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case 1, 3:
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img = gopher2
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case 2:
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img = gopher3
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}
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}
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screen.DrawImage(img, nil)
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}
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func main() {
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ebiten.SetWindowDecorated(false)
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ebiten.SetWindowFloating(true)
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ebiten.SetWindowSize(width, height)
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op := &ebiten.RunGameOptions{}
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op.ScreenTransparent = true
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op.SkipTaskbar = true
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if err := ebiten.RunGameWithOptions(&mascot{}, op); err != nil {
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log.Fatal(err)
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}
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}
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