64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
|
package software
|
||
|
|
|
||
|
|
import (
|
||
|
|
"image"
|
||
|
|
|
||
|
|
"fyne.io/fyne/v2"
|
||
|
|
"fyne.io/fyne/v2/canvas"
|
||
|
|
"fyne.io/fyne/v2/internal/driver"
|
||
|
|
"fyne.io/fyne/v2/internal/scale"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Painter is a simple software painter that can paint a canvas in memory.
|
||
|
|
type Painter struct {
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewPainter creates a new Painter.
|
||
|
|
func NewPainter() *Painter {
|
||
|
|
return &Painter{}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Paint is the main entry point for a simple software painter.
|
||
|
|
// The canvas to be drawn is passed in as a parameter and the return is an
|
||
|
|
// image containing the result of rendering.
|
||
|
|
func (*Painter) Paint(c fyne.Canvas) image.Image {
|
||
|
|
bounds := image.Rect(0, 0, scale.ToScreenCoordinate(c, c.Size().Width), scale.ToScreenCoordinate(c, c.Size().Height))
|
||
|
|
base := image.NewNRGBA(bounds)
|
||
|
|
|
||
|
|
paint := func(obj fyne.CanvasObject, pos, clipPos fyne.Position, clipSize fyne.Size) bool {
|
||
|
|
w := fyne.Min(clipPos.X+clipSize.Width, c.Size().Width)
|
||
|
|
h := fyne.Min(clipPos.Y+clipSize.Height, c.Size().Height)
|
||
|
|
clip := image.Rect(
|
||
|
|
scale.ToScreenCoordinate(c, clipPos.X),
|
||
|
|
scale.ToScreenCoordinate(c, clipPos.Y),
|
||
|
|
scale.ToScreenCoordinate(c, w),
|
||
|
|
scale.ToScreenCoordinate(c, h),
|
||
|
|
)
|
||
|
|
switch o := obj.(type) {
|
||
|
|
case *canvas.Image:
|
||
|
|
drawImage(c, o, pos, base, clip)
|
||
|
|
case *canvas.Text:
|
||
|
|
drawText(c, o, pos, base, clip)
|
||
|
|
case gradient:
|
||
|
|
drawGradient(c, o, pos, base, clip)
|
||
|
|
case *canvas.Circle:
|
||
|
|
drawCircle(c, o, pos, base, clip)
|
||
|
|
case *canvas.Line:
|
||
|
|
drawLine(c, o, pos, base, clip)
|
||
|
|
case *canvas.Raster:
|
||
|
|
drawRaster(c, o, pos, base, clip)
|
||
|
|
case *canvas.Rectangle:
|
||
|
|
drawRectangle(c, o, pos, base, clip)
|
||
|
|
}
|
||
|
|
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
driver.WalkVisibleObjectTree(c.Content(), paint, nil)
|
||
|
|
for _, o := range c.Overlays().List() {
|
||
|
|
driver.WalkVisibleObjectTree(o, paint, nil)
|
||
|
|
}
|
||
|
|
|
||
|
|
return base
|
||
|
|
}
|