108 lines
2.2 KiB
Go
108 lines
2.2 KiB
Go
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package allg5
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// #include <allegro5/allegro.h>
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// #include <allegro5/allegro_font.h>
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// #include <allegro5/allegro_ttf.h>
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import "C"
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import (
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"fmt"
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"unsafe"
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)
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type Font struct {
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font *C.ALLEGRO_FONT
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hght float32
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asc float32
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desc float32
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}
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type HorizontalAlignment int
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const (
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AlignLeft HorizontalAlignment = iota
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AlignCenter
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AlignRight
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)
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func LoadTTFFont(path string, size int) (*Font, error) {
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p := C.CString(path)
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defer C.free(unsafe.Pointer(p))
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f := C.al_load_ttf_font(p, C.int(size), 0)
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if f == nil {
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return nil, fmt.Errorf("unable to load ttf font '%s'", path)
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}
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return &Font{f, 0, 0, 0}, nil
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}
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func (f *Font) drawFlags(a HorizontalAlignment) C.int {
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switch a {
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case AlignLeft:
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return C.ALLEGRO_ALIGN_LEFT
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case AlignCenter:
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return C.ALLEGRO_ALIGN_CENTRE
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case AlignRight:
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return C.ALLEGRO_ALIGN_RIGHT
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}
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return C.ALLEGRO_ALIGN_LEFT
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}
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func (f *Font) Draw(left, top float32, color Color, align HorizontalAlignment, text string) {
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t := C.CString(text)
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defer C.free(unsafe.Pointer(t))
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flags := f.drawFlags(align)
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C.al_draw_text(f.font, color.color, C.float(left), C.float(top), flags, t)
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}
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// Ascent returns the ascent of the font
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func (f *Font) Ascent() float32 {
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if f.asc == 0 {
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f.asc = float32(C.al_get_font_ascent(f.font))
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}
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return f.asc
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}
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// Descent returns the descent of the font.
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func (f *Font) Descent() float32 {
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if f.desc == 0 {
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f.desc = float32(C.al_get_font_descent(f.font))
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}
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return f.desc
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}
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// Height returns the height of the font
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func (f *Font) Height() float32 {
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if f.hght == 0 {
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f.hght = f.Ascent() + f.Descent()
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}
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return f.hght
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}
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// TextDimensions returns the bounding box of the rendered text.
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func (f *Font) TextDimensions(text string) (x, y, w, h float32) {
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t := C.CString(text)
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defer C.free(unsafe.Pointer(t))
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var bbx, bby, bbw, bbh C.int
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C.al_get_text_dimensions(f.font, t, &bbx, &bby, &bbw, &bbh)
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x = float32(bbx)
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y = float32(bby)
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w = float32(bbw)
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h = float32(bbh)
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return
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}
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// TextWidth returns the width of the rendered text.
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func (f *Font) TextWidth(text string) float32 {
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t := C.CString(text)
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defer C.free(unsafe.Pointer(t))
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return float32(C.al_get_text_width(f.font, t))
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}
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func (f *Font) Destroy() {
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C.al_destroy_font(f.font)
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}
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