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main.go
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main.go
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/*
* main.go
*
* Copyright 2022 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 of creating and using MTK textedit.
package main
import (
"fmt"
"io/ioutil"
"os"
"golang.org/x/image/colornames"
"github.com/golang/freetype/truetype"
"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 textedit example",
Bounds: pixel.R(0, 0, 1600, 900),
}
// 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 & set main UI font.
font, err := loadFont("SIMSUN.ttf")
if err != nil {
// MTK has fallback font, so we don't need to panic.
fmt.Printf("Unable to load main font: %v\n", err)
}
mtk.SetMainFont(font)
// Create textedit.
params := mtk.Params{
FontSize: mtk.SizeMedium,
MainColor: colornames.Grey,
SizeRaw: pixel.V(200, 30),
}
textedit := mtk.NewTextedit(params)
// Main loop.
for !win.Closed() {
// Clear window.
win.Clear(colornames.Black)
// Draw textedit.
texteditPos := win.Bounds().Center()
textedit.Draw(win, mtk.Matrix().Moved(texteditPos))
// Update.
win.Update()
textedit.Update(win)
// Key events.
if win.JustPressed(pixelgl.KeyEnter) {
fmt.Printf("Input: %s\n", textedit.Text())
}
}
}
// loadFont reads font file from specified path
// and returns font face or error if file was
// not found.
func loadFont(path string) (*truetype.Font, error) {
file, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("unable to open file: %v", err)
}
defer file.Close()
bytes, err := ioutil.ReadAll(file)
if err != nil {
return nil, fmt.Errorf("unable to read file: %v", err)
}
font, err := truetype.Parse(bytes)
if err != nil {
return nil, fmt.Errorf("unable to parse font: %v", err)
}
return font, nil
}