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giocanvas.go
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giocanvas.go
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// Package giocanvas is a 2D canvas API built on gio
package giocanvas
import (
"image/color"
"gioui.org/app"
"gioui.org/font"
"gioui.org/font/gofont"
"gioui.org/layout"
"gioui.org/op"
"gioui.org/text"
"gioui.org/widget/material"
)
// Canvas defines the Gio canvas
type Canvas struct {
Width, Height float32
Theme *material.Theme
TextColor color.NRGBA
Context layout.Context
}
// setupCanvas sets up common canvas items
func setupCanvas(width, height float32, e app.FrameEvent, f []font.FontFace) *Canvas {
canvas := new(Canvas)
canvas.Width = width
canvas.Height = height
canvas.TextColor = color.NRGBA{0, 0, 0, 255}
theme := material.NewTheme()
theme.Shaper = text.NewShaper(text.NoSystemFonts(), text.WithCollection(f))
canvas.Theme = theme
canvas.Context = app.NewContext(new(op.Ops), e)
iw, ih := int(width), int(height)
canvas.Context.Constraints.Min.X = iw
canvas.Context.Constraints.Min.Y = ih
canvas.Context.Constraints.Max.X = iw
canvas.Context.Constraints.Max.Y = ih
return canvas
}
// NewCanvas initializes a Canvas using the default font set
func NewCanvas(width, height float32, e app.FrameEvent) *Canvas {
return setupCanvas(width, height, e, gofont.Regular())
}
// NewCanvasFonts initializes a canvas with a specified set of set of fonts
func NewCanvasFonts(width, height float32, fonts []font.FontFace, e app.FrameEvent) *Canvas {
return setupCanvas(width, height, e, fonts)
}