Pixel drawing.
https://pkg.go.dev/maze.io/x/pixel
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
1.5 KiB
85 lines
1.5 KiB
package pixel
|
|
|
|
/*
|
|
func Scroll(buffer Image, xstep, ystep int) {
|
|
if xstep == 0 {
|
|
if ystep > 0 {
|
|
for n := 0; n < ystep; n++ {
|
|
ScrollDown(buffer)
|
|
}
|
|
return
|
|
}
|
|
for n := 0; n < -ystep; n++ {
|
|
ScrollUp(buffer)
|
|
}
|
|
return
|
|
}
|
|
|
|
var (
|
|
sx, y, dx, dy, ex, ey int
|
|
cx, cy int
|
|
b = buffer.Bounds()
|
|
)
|
|
if xstep < 0 {
|
|
sx = 0
|
|
ex = b.Dx() + xstep
|
|
dx = 1
|
|
cx = b.Dx() - 1
|
|
} else {
|
|
sx = b.Dx() - 1
|
|
ex = xstep - 1
|
|
dx = -1
|
|
}
|
|
if ystep < 0 {
|
|
y = 0
|
|
ey = b.Dy() + ystep
|
|
dy = 1
|
|
cy = b.Dy() - 1
|
|
} else {
|
|
y = b.Dy() - 1
|
|
ey = ystep - 1
|
|
dy = -1
|
|
}
|
|
log.Printf("scroll: clearx: %d, cleary: %d", cx, cy)
|
|
for ; y != ey; y += dy {
|
|
for x := sx; x != ex; x += dx {
|
|
if x == cx || y == cy {
|
|
buffer.Set(x, y, color.Black)
|
|
} else {
|
|
buffer.Set(x, y, buffer.At(x-xstep, y-ystep))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*/
|
|
|
|
func ScrollUp(b Image) {
|
|
switch b := b.(type) {
|
|
case *Bitmap:
|
|
copy(b.Pix, b.Pix[b.Stride:])
|
|
l := len(b.Pix)
|
|
zeroRange(b.Pix, l-b.Stride, l)
|
|
case *RGB565:
|
|
copy(b.Pix, b.Pix[b.Stride:])
|
|
l := len(b.Pix)
|
|
zeroRange(b.Pix, l-b.Stride, l)
|
|
case *RGB888:
|
|
copy(b.Pix, b.Pix[b.Stride:])
|
|
l := len(b.Pix)
|
|
zeroRange(b.Pix, l-b.Stride, l)
|
|
}
|
|
}
|
|
|
|
func ScrollDown(b Image) {
|
|
switch b := b.(type) {
|
|
case *Bitmap:
|
|
copy(b.Pix[b.Stride:], b.Pix)
|
|
zeroRange(b.Pix, 0, b.Stride)
|
|
case *RGB565:
|
|
copy(b.Pix[b.Stride:], b.Pix)
|
|
zeroRange(b.Pix, 0, b.Stride)
|
|
case *RGB888:
|
|
copy(b.Pix[b.Stride:], b.Pix)
|
|
zeroRange(b.Pix, 0, b.Stride)
|
|
}
|
|
}
|