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 (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
}