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121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
// Copyright 2021 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package waveshare2in13v2_test
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import (
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"image"
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"image/draw"
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"log"
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"golang.org/x/image/font"
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"golang.org/x/image/font/basicfont"
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"golang.org/x/image/math/fixed"
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"github.com/fogleman/gg"
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"github.com/golang/freetype/truetype"
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"golang.org/x/image/font/gofont/goregular"
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"periph.io/x/conn/v3/spi/spireg"
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"periph.io/x/devices/v3/ssd1306/image1bit"
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"periph.io/x/devices/v3/waveshare2in13v2"
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"periph.io/x/host/v3"
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)
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func Example() {
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// Make sure periph is initialized.
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if _, err := host.Init(); err != nil {
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log.Fatal(err)
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}
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// Use spireg SPI bus registry to find the first available SPI bus.
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b, err := spireg.Open("")
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if err != nil {
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log.Fatal(err)
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}
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defer b.Close()
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dev, err := waveshare2in13v2.NewHat(b, &waveshare2in13v2.EPD2in13v2) // Display config and size
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if err != nil {
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log.Fatalf("failed to initialize epd: %v", err)
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}
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// Draw on it. Black text on a white background.
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img := image1bit.NewVerticalLSB(dev.Bounds())
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draw.Draw(img, img.Bounds(), &image.Uniform{image1bit.On}, image.Point{}, draw.Src)
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f := basicfont.Face7x13
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drawer := font.Drawer{
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Dst: img,
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Src: &image.Uniform{image1bit.Off},
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Face: f,
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Dot: fixed.P(0, img.Bounds().Dy()-1-f.Descent),
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}
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drawer.DrawString("Hello from periph!")
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if err := dev.Draw(dev.Bounds(), img, image.Point{}); err != nil {
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log.Fatal(err)
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}
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}
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func Example_other() {
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// Make sure periph is initialized.
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if _, err := host.Init(); err != nil {
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log.Fatal(err)
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}
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// Use spireg SPI bus registry to find the first available SPI bus.
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b, err := spireg.Open("")
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if err != nil {
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log.Fatal(err)
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}
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defer b.Close()
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dev, err := waveshare2in13v2.NewHat(b, &waveshare2in13v2.EPD2in13v2) // Display config and size
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if err != nil {
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log.Fatalf("failed to initialize epd: %v", err)
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}
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var img image.Image
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bounds := dev.Bounds()
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w := bounds.Dx()
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h := bounds.Dy()
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dc := gg.NewContext(w, h)
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im, err := gg.LoadPNG("gopher.png")
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if err != nil {
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panic(err)
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}
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dc.SetRGB(1, 1, 1)
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dc.Clear()
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dc.SetRGB(0, 0, 0)
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dc.Rotate(gg.Radians(90))
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dc.Translate(0.0, -float64(h/2))
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font, err := truetype.Parse(goregular.TTF)
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if err != nil {
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panic(err)
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}
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face := truetype.NewFace(font, &truetype.Options{
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Size: 16,
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})
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dc.SetFontFace(face)
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text := "Hello from periph!"
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tw, th := dc.MeasureString(text)
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dc.DrawImage(im, 120, 30)
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padding := 8.0
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dc.DrawRoundedRectangle(padding*2, padding*2, tw+padding*2, th+padding, 10)
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dc.Stroke()
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dc.DrawString(text, padding*3, padding*2+th)
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for i := 0; i < 10; i++ {
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dc.DrawCircle(float64(30+(10*i)), 100, 5)
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}
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for i := 0; i < 10; i++ {
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dc.DrawRectangle(float64(30+(10*i)), 80, 5, 5)
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}
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dc.Fill()
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img = dc.Image()
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if err := dev.Draw(dev.Bounds(), img, image.Point{}); err != nil {
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log.Fatal(err)
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}
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}
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