func (mw *MainWindow) drawStuff(canvas *walk.Canvas, updateBounds walk.Rectangle) error {
bmp := createBitmap()
defer bmp.Dispose()
bounds := mw.paintWidget.ClientBounds()
rectPen, _ := walk.NewCosmeticPen(walk.PenSolid, walk.RGB(255, 0, 0))
defer rectPen.Dispose()
canvas.DrawRectangle(rectPen, bounds)
ellipseBrush, _ := walk.NewHatchBrush(walk.RGB(0, 255, 0), walk.HatchCross)
defer ellipseBrush.Dispose()
canvas.FillEllipse(ellipseBrush, bounds)
linesBrush, _ := walk.NewSolidColorBrush(walk.RGB(0, 0, 255))
defer linesBrush.Dispose()
linesPen, _ := walk.NewGeometricPen(walk.PenDash, 8, linesBrush)
defer linesPen.Dispose()
canvas.DrawLine(linesPen, walk.Point{bounds.X, bounds.Y}, walk.Point{bounds.Width, bounds.Height})
canvas.DrawLine(linesPen, walk.Point{bounds.X, bounds.Height}, walk.Point{bounds.Width, bounds.Y})
bmpSize := bmp.Size()
canvas.DrawImage(bmp, walk.Point{(bounds.Width - bmpSize.Width) / 2, (bounds.Height - bmpSize.Height) / 2})
return nil
}
func main() {
var mw *walk.MainWindow
var c1 *walk.Composite
var c2 *walk.Composite
bmp, err := walk.NewBitmapFromFile("../../img/plus.png")
if err != nil {
panic(err)
}
defer bmp.Dispose()
MainWindow{
AssignTo: &mw,
Title: "Background Example",
Layout: VBox{MarginsZero: true},
MinSize: Size{300, 400},
Children: []Widget{
Composite{
AssignTo: &c1,
Layout: VBox{},
Children: []Widget{
TextEdit{},
},
},
Composite{
AssignTo: &c2,
Layout: VBox{},
Children: []Widget{
TextEdit{},
},
},
ImageView{
Image: bmp,
},
},
}.Create()
scb, err := walk.NewSolidColorBrush(walk.RGB(255, 0, 0))
if err != nil {
panic(err)
}
defer scb.Dispose()
c1.SetBackground(scb)
bmb, err := walk.NewBitmapBrush(bmp)
if err != nil {
panic(err)
}
defer bmb.Dispose()
c2.SetBackground(bmb)
mw.Show()
mw.Run()
}
func NewMyWidget(parent walk.Container) (*MyWidget, error) {
w := new(MyWidget)
if err := walk.InitChildWidget(
w,
parent,
myWidgetWindowClass,
winapi.WS_VISIBLE,
0); err != nil {
return nil, err
}
bg, err := walk.NewSolidColorBrush(walk.RGB(0, 255, 0))
if err != nil {
return nil, err
}
w.SetBackground(bg)
return w, nil
}
func (mw *MyMainWindow) drawStuff(canvas *walk.Canvas, updateBounds walk.Rectangle) error {
bmp, err := createBitmap()
if err != nil {
return err
}
defer bmp.Dispose()
bounds := mw.paintWidget.ClientBounds()
rectPen, err := walk.NewCosmeticPen(walk.PenSolid, walk.RGB(255, 0, 0))
if err != nil {
return err
}
defer rectPen.Dispose()
if err := canvas.DrawRectangle(rectPen, bounds); err != nil {
return err
}
ellipseBrush, err := walk.NewHatchBrush(walk.RGB(0, 255, 0), walk.HatchCross)
if err != nil {
return err
}
defer ellipseBrush.Dispose()
if err := canvas.FillEllipse(ellipseBrush, bounds); err != nil {
return err
}
linesBrush, err := walk.NewSolidColorBrush(walk.RGB(0, 0, 255))
if err != nil {
return err
}
defer linesBrush.Dispose()
linesPen, err := walk.NewGeometricPen(walk.PenDash, 8, linesBrush)
if err != nil {
return err
}
defer linesPen.Dispose()
if err := canvas.DrawLine(linesPen, walk.Point{bounds.X, bounds.Y}, walk.Point{bounds.Width, bounds.Height}); err != nil {
return err
}
if err := canvas.DrawLine(linesPen, walk.Point{bounds.X, bounds.Height}, walk.Point{bounds.Width, bounds.Y}); err != nil {
return err
}
points := make([]walk.Point, 10)
dx := bounds.Width / (len(points) - 1)
for i := range points {
points[i].X = i * dx
points[i].Y = int(float64(bounds.Height) / math.Pow(float64(bounds.Width/2), 2) * math.Pow(float64(i*dx-bounds.Width/2), 2))
}
if err := canvas.DrawPolyline(linesPen, points); err != nil {
return err
}
bmpSize := bmp.Size()
if err := canvas.DrawImage(bmp, walk.Point{(bounds.Width - bmpSize.Width) / 2, (bounds.Height - bmpSize.Height) / 2}); err != nil {
return err
}
return nil
}