func main() {
defer Recovery()
X, Xerr = xgbutil.Dial("")
if Xerr != nil {
panic(Xerr)
}
active, _ := ewmh.ActiveWindowGet(X)
icons, _ := ewmh.WmIconGet(X, active)
var width, height int = 300, 300
work := xgraphics.FindBestIcon(width, height, icons)
if work != nil {
fmt.Printf("Working with icon (%d, %d)\n", work.Width, work.Height)
} else {
fmt.Println("No good icon... :-(")
return
}
eimg, emask := xgraphics.EwmhIconToImage(work)
img := xgraphics.Scale(eimg, int(width), int(height))
mask := xgraphics.Scale(emask, int(width), int(height))
dest := xgraphics.BlendBg(img, mask, 100, color.RGBA{0, 0, 255, 255})
// Let's try to write some text...
// xgraphics.DrawText(dest, 50, 50, color.RGBA{255, 255, 255, 255}, 20,
// fontFile, "Hello, world!")
// tw, th, err := xgraphics.TextExtents(fontFile, 11, "Hiya")
// fmt.Println(tw, th, err)
win := xgraphics.CreateImageWindow(X, dest, 3940, 0)
X.Conn().MapWindow(win)
// time.Sleep(20 * time.Second)
select {}
}
func main() {
X, err := xgbutil.NewConn()
fatal(err)
// Whenever the mousebind package is used, you must call Initialize.
// Similarly for the keybind package.
keybind.Initialize(X)
mousebind.Initialize(X)
// Easter egg! Use a right click to draw a gopher.
gopherPng, _, err := image.Decode(bytes.NewBuffer(gopher.GopherPng()))
fatal(err)
// Now scale it to a reasonable size.
gopher := xgraphics.Scale(gopherPng, gopherWidth, gopherHeight)
// Create a new xgraphics.Image. It automatically creates an X pixmap for
// you, and handles drawing to windows in the XDraw, XPaint and
// XSurfaceSet functions.
// N.B. An error is possible since X pixmap allocation can fail.
canvas := xgraphics.New(X, image.Rect(0, 0, width, height))
// Color in the background color.
canvas.For(func(x, y int) xgraphics.BGRA {
return bg
})
// Use the convenience function XShowExtra to create and map the
// canvas window.
// XShowExtra will also set the surface window of canvas for us.
// We also use XShowExtra to set the name of the window and to quit the
// main event loop when the window is closed.
win := canvas.XShowExtra("Pointer painting", true)
// Listen for pointer motion events and key press events.
win.Listen(xproto.EventMaskButtonPress | xproto.EventMaskButtonRelease |
xproto.EventMaskKeyPress)
// The mousebind drag function runs three callbacks: one when the drag is
// first started, another at each "step" in the drag, and a final one when
// the drag is done.
// The button sequence (in this case '1') is pressed, the first callback
// is executed. If the first return value is true, the drag continues
// and a pointer grab is initiated with the cursor id specified in the
// second return value (use 0 to keep the cursor unchanged).
// If it's false, the drag stops.
// Note that Drag will automatically compress MotionNotify events.
mousebind.Drag(X, win.Id, win.Id, "1", false,
func(X *xgbutil.XUtil, rx, ry, ex, ey int) (bool, xproto.Cursor) {
drawPencil(canvas, win, ex, ey)
return true, 0
},
func(X *xgbutil.XUtil, rx, ry, ex, ey int) {
drawPencil(canvas, win, ex, ey)
},
func(X *xgbutil.XUtil, rx, ry, ex, ey int) {})
mousebind.Drag(X, win.Id, win.Id, "3", false,
func(X *xgbutil.XUtil, rx, ry, ex, ey int) (bool, xproto.Cursor) {
drawGopher(canvas, gopher, win, ex, ey)
return true, 0
},
func(X *xgbutil.XUtil, rx, ry, ex, ey int) {
drawGopher(canvas, gopher, win, ex, ey)
},
func(X *xgbutil.XUtil, rx, ry, ex, ey int) {})
// Bind to the clear key specified, and just redraw the bg color.
keybind.KeyPressFun(
func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
clearCanvas(canvas, win)
}).Connect(X, win.Id, clearKey, false)
// Bind a callback to each key specified in the 'pencils' color map.
// The response is to simply switch the pencil color.
for key, clr := range pencils {
c := clr
keybind.KeyPressFun(
func(X *xgbutil.XUtil, ev xevent.KeyPressEvent) {
log.Printf("Changing pencil color to: %#v", c)
pencil = c
}).Connect(X, win.Id, key, false)
}
// Output some basic directions.
fmt.Println("Use the left or right buttons on your mouse to paint " +
"squares and gophers.")
fmt.Println("Pressing numbers 1, 2, 3, 4, 5 or 6 will switch your pencil " +
"color.")
fmt.Println("Pressing 'c' will clear the canvas.")
xevent.Main(X)
}
