diff options
| -rw-r--r-- | prototypes/xgb-window.go | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/prototypes/xgb-window.go b/prototypes/xgb-window.go index 2519fe9..3944fa4 100644 --- a/prototypes/xgb-window.go +++ b/prototypes/xgb-window.go @@ -4,6 +4,7 @@ import ( "github.com/BurntSushi/xgb" "github.com/BurntSushi/xgb/xproto" "log" + "math" "math/rand" ) @@ -73,6 +74,17 @@ func main() { _ = xproto.CreateGC(X, cid, xproto.Drawable(wid), xproto.GcGraphicsExposures, []uint32{0}) + blend := func(a, b uint32, ratio, gamma float64) uint32 { + iratio := 1 - ratio + + fa := math.Pow(float64(a)/255, gamma) + fb := math.Pow(float64(b)/255, gamma) + + return uint32(math.Pow(ratio*fa+iratio*fb, 1/gamma)*255) & 0xff + } + + // TODO: We could show some text just like we intend to with xgb-xrender.go. + var w, h uint16 var start, end uint32 = 0xabcdef, 0x32ab54 gradient := func() { @@ -86,17 +98,28 @@ func main() { for y := low; y < high; y++ { ratio := float64(y-low) / (float64(high) - float64(low)) - iratio := 1 - ratio - rR := uint32(ratio*float64(ra)+iratio*float64(rb)) & 0xff - gG := uint32(ratio*float64(ga)+iratio*float64(gb)) & 0xff - bB := uint32(ratio*float64(ba)+iratio*float64(bb)) & 0xff + rR := blend(ra, rb, ratio, 2.2) + gG := blend(ga, gb, ratio, 2.2) + bB := blend(ba, bb, ratio, 2.2) _ = xproto.ChangeGC(X, cid, xproto.GcForeground, []uint32{0xff000000 | rR<<16 | gG<<8 | bB}) _ = xproto.PolyLine(X, xproto.CoordModeOrigin, xproto.Drawable(wid), cid, []xproto.Point{ {X: 50, Y: int16(y)}, + {X: int16(w / 2), Y: int16(y)}, + }) + + rR = blend(ra, rb, ratio, 1) + gG = blend(ga, gb, ratio, 1) + bB = blend(ba, bb, ratio, 1) + + _ = xproto.ChangeGC(X, cid, xproto.GcForeground, + []uint32{0xff000000 | rR<<16 | gG<<8 | bB}) + _ = xproto.PolyLine(X, xproto.CoordModeOrigin, xproto.Drawable(wid), + cid, []xproto.Point{ + {X: int16(w / 2), Y: int16(y)}, {X: int16(w - 50), Y: int16(y)}, }) } |