func newNullPen() *nullPen {
lb := &win.LOGBRUSH{LbStyle: win.BS_NULL}
hPen := win.ExtCreatePen(win.PS_COSMETIC|win.PS_NULL, 1, lb, 0, nil)
if hPen == 0 {
panic("failed to create null brush")
}
return &nullPen{hPen: hPen}
}
func NewCosmeticPen(style PenStyle, color Color) (*CosmeticPen, error) {
lb := &win.LOGBRUSH{LbStyle: win.BS_SOLID, LbColor: win.COLORREF(color)}
style |= win.PS_COSMETIC
hPen := win.ExtCreatePen(uint32(style), 1, lb, 0, nil)
if hPen == 0 {
return nil, newError("ExtCreatePen failed")
}
return &CosmeticPen{hPen: hPen, style: style, color: color}, nil
}
func NewGeometricPen(style PenStyle, width int, brush Brush) (*GeometricPen, error) {
if brush == nil {
return nil, newError("brush cannot be nil")
}
style |= win.PS_GEOMETRIC
hPen := win.ExtCreatePen(uint32(style), uint32(width), brush.logbrush(), 0, nil)
if hPen == 0 {
return nil, newError("ExtCreatePen failed")
}
return &GeometricPen{
hPen: hPen,
style: style,
width: width,
brush: brush,
}, nil
}