diff options
| -rw-r--r-- | examples/shapes/main.go | 47 |
1 files changed, 46 insertions, 1 deletions
diff --git a/examples/shapes/main.go b/examples/shapes/main.go index 4025448..1ece00f 100644 --- a/examples/shapes/main.go +++ b/examples/shapes/main.go @@ -7,6 +7,7 @@ package main import ( "fmt" + "unicode/utf8" "github.com/jezek/xgb" "github.com/jezek/xgb/xproto" @@ -27,7 +28,7 @@ func main() { // Create the window xproto.CreateWindow(X, screen.RootDepth, wid, screen.Root, - 0, 0, 180, 160, 8, // X, Y, width, height, *border width* + 0, 0, 180, 200, 8, // X, Y, width, height, *border width* xproto.WindowClassInputOutput, screen.RootVisual, xproto.CwBackPixel|xproto.CwEventMask, []uint32{screen.WhitePixel, xproto.EventMaskStructureNotify | xproto.EventMaskExposure}) @@ -92,6 +93,27 @@ func main() { values = []uint32{3, xproto.CapStyleRound} xproto.ChangeGC(X, foreground, mask, values) + // Writing text needs a bit more setup -- we first have + // to open the required font. + // For all available fonts, install and run xfontsel. + font, _ := xproto.NewFontId(X) + fontname := "-gnu-unifont-*-*-*-*-16-*-*-*-*-*-*-*" + err = xproto.OpenFontChecked(X, font, uint16(len(fontname)), fontname).Check() + if err != nil { + fmt.Println("Failed opening the font:", err) + return + } + + // And create a context from it. We simply pass the font's ID to the GcFont property. + textCtx, _ := xproto.NewGcontextId(X) + mask = uint32(xproto.GcForeground | xproto.GcBackground | xproto.GcFont) + values = []uint32{screen.BlackPixel, screen.WhitePixel, uint32(font)} + xproto.CreateGC(X, textCtx, draw, mask, values) + text := convertStringToChar2b("Hellö World!") + + // In the end, writing text is way more comfortable using Xft - it supports TrueType, + // and overall better configuration. + points := []xproto.Point{ {X: 10, Y: 10}, {X: 20, Y: 10}, @@ -171,6 +193,9 @@ func main() { // There's also a fill variant for all drawing commands: xproto.PolyFillRectangle(X, draw, red, rectangles2) + // Draw the text: + xproto.ImageText16(X, byte(len(text)), draw, textCtx, 10, 160, text) + case xproto.DestroyNotifyEvent: return } @@ -181,3 +206,23 @@ func main() { } } } + +func convertStringToChar2b(s string) []xproto.Char2b { + var chars []xproto.Char2b + var p []byte = make([]byte, 2) + + for _, r := range []rune(s) { + utf8.EncodeRune(p, r) + switch utf8.RuneLen(r) { + case 1: + chars = append(chars, xproto.Char2b{Byte1: 0, Byte2: p[0]}) + case 2: + chars = append(chars, xproto.Char2b{Byte1: p[0], Byte2: p[1]}) + fmt.Println(p[0], p[1]) + default: + continue // skip all other characters + } + } + + return chars +} |