pen.go

package gform

import (
	"github.com/AllenDang/w32"
)

type Pen struct {
    hPen  w32.HPEN
    style uint
    brush *Brush
}

func NewPen(style uint, width uint, brush *Brush) *Pen {
    if brush == nil {
        panic("Brush cannot be nil")
    }

    hPen := w32.ExtCreatePen(style, width, brush.GetLOGBRUSH(), 0, nil)
    if hPen == 0 {
        panic("Failed to create pen")
    }

    return &Pen{hPen, style, brush}
}

func NewNullPen() *Pen {
    lb := w32.LOGBRUSH{LbStyle: w32.BS_NULL}

    hPen := w32.ExtCreatePen(w32.PS_COSMETIC|w32.PS_NULL, 1, &lb, 0, nil)
    if hPen == 0 {
        panic("failed to create null brush")
    }

    return &Pen{hPen: hPen}
}

func (this *Pen) Style() uint {
    return this.style
}

func (this *Pen) Brush() *Brush {
    return this.brush
}

func (this *Pen) GetHPEN() w32.HPEN {
    return this.hPen
}

func (this *Pen) Dispose() {
    if this.hPen != 0 {
        w32.DeleteObject(w32.HGDIOBJ(this.hPen))
        this.hPen = 0
    }
}