diff options
Diffstat (limited to 'examples/shapes/main.go')
| -rw-r--r-- | examples/shapes/main.go | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/examples/shapes/main.go b/examples/shapes/main.go index c03071f..fd8704e 100644 --- a/examples/shapes/main.go +++ b/examples/shapes/main.go @@ -41,12 +41,21 @@ func main() { // // But this time we'll be drawing some basic shapes: - // Create black (foreground) graphic context + // First of all we need to create a context to draw with. + // We can get a new context id using NewContextId() + // and have to initialize it with the values: foreground, _ := xproto.NewGcontextId(X) mask := uint32(xproto.GcForeground | xproto.GcGraphicsExposures) values := []uint32{screen.BlackPixel, 0} xproto.CreateGC(X, foreground, draw, mask, values) + // We can also create colored shapes by setting the first value + // when creating the graphics context: + red, _ := xproto.NewGcontextId(X) + // simply reuse the old mask but change the color value: + values[0] = 0xff0000 + xproto.CreateGC(X, red, draw, mask, values) + points := []xproto.Point{ {X: 10, Y: 10}, {X: 20, Y: 10}, @@ -54,12 +63,14 @@ func main() { {X: 40, Y: 10}, } - // A polyline is essientially a line with multiple points: + // A polyline is essientially a line with multiple points. + // The first point is placed absolutely on the screen. + // The other points are relative to the one before them polyline := []xproto.Point{ {X: 50, Y: 10}, - {X: 5, Y: 20}, // rest of points are relative - {X: 25, Y: -20}, - {X: 10, Y: 10}, + {X: 5, Y: 20}, // move 5 to the right, 20 down + {X: 25, Y: -20}, // move 25 to the right, 20 up - notice how this point is level again with the first point + {X: 10, Y: 10}, // move 10 to the right, 10 down } segments := []xproto.Segment{ |