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main.go
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main.go
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/*
* main.go
*
* Copyright 2019-2020 Dariusz Sikora <dev@isangeles.pl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*
*/
// Example for creating simple MTK animation.
package main
import (
"fmt"
"image"
_ "image/png"
"os"
"golang.org/x/image/colornames"
"github.com/gopxl/pixel"
"github.com/gopxl/pixel/pixelgl"
"github.com/isangeles/mtk"
)
// Main function.
func main() {
// Run Pixel graphic.
pixelgl.Run(run)
}
// All window code fired from there.
func run() {
// Create Pixel window configuration.
cfg := pixelgl.WindowConfig{
Title: "MTK animation example",
Bounds: pixel.R(0, 0, 1600, 900),
VSync: true,
}
// Create MTK warpper for Pixel window.
win, err := mtk.NewWindow(cfg)
if err != nil {
panic(fmt.Errorf("Unable to create mtk window: %v", err))
}
// Load spritesheet image.
ss, err := loadPicture("spritesheet.png")
if err != nil {
panic(fmt.Errorf("Unable to load spritesheet: %v", err))
}
// Retrieve frames from spritesheet.
frames := cutFrames(ss)
// Create animation from frames,
// 2 frames per second.
anim := mtk.NewAnimation(frames, 2)
// Main loop.
for !win.Closed() {
// Clear window.
win.Clear(colornames.Black)
// Draw.
animPos := win.Bounds().Center()
anim.Draw(win.Window, mtk.Matrix().Moved(animPos))
// Update.
win.Update()
anim.Update(win)
}
}
// loadPicture loads picture from file with specified path.
func loadPicture(path string) (pixel.Picture, error) {
file, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("unable to open image file: %v", err)
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
return nil, fmt.Errorf("unable to decode image: %v", err)
}
return pixel.PictureDataFromImage(img), nil
}
// cutFrames retrieves all frames from 100x100
// spritesheet(4 50x50 frames).
func cutFrames(ss pixel.Picture) []*pixel.Sprite {
frame1 := pixel.NewSprite(ss, pixel.R(0, 0, 50, 50))
frame2 := pixel.NewSprite(ss, pixel.R(50, 0, 100, 50))
frame3 := pixel.NewSprite(ss, pixel.R(0, 50, 50, 100))
frame4 := pixel.NewSprite(ss, pixel.R(50, 50, 100, 100))
return []*pixel.Sprite{frame1, frame2, frame3, frame4}
}