/
getrect.go
135 lines (125 loc) · 3.11 KB
/
getrect.go
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package draw
import (
"log"
)
var (
grTmp [4]*Image
grRed *Image
)
var sweep = Cursor{
Point{-7, -7},
[2 * 16]uint8{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x07,
0xE0, 0x07, 0xE0, 0x07, 0xE3, 0xF7, 0xE3, 0xF7,
0xE3, 0xE7, 0xE3, 0xF7, 0xE3, 0xFF, 0xE3, 0x7F,
0xE0, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
[2 * 16]uint8{0x00, 0x00, 0x7F, 0xFE, 0x40, 0x02, 0x40, 0x02,
0x40, 0x02, 0x40, 0x02, 0x40, 0x02, 0x41, 0xE2,
0x41, 0xC2, 0x41, 0xE2, 0x41, 0x72, 0x40, 0x38,
0x40, 0x1C, 0x40, 0x0E, 0x7F, 0xE6, 0x00, 0x00},
}
const BorderWidth = 4
func brects(r Rectangle) [4]Rectangle {
const W = BorderWidth
if r.Dx() < 2*W {
r.Max.X = r.Min.X + 2*W
}
if r.Dy() < 2*W {
r.Max.Y = r.Min.Y + 2*W
}
var rp [4]Rectangle
rp[0] = Rect(r.Min.X, r.Min.Y, r.Max.X, r.Min.Y+W)
rp[1] = Rect(r.Min.X, r.Max.Y-W, r.Max.X, r.Max.Y)
rp[2] = Rect(r.Min.X, r.Min.Y+W, r.Min.X+W, r.Max.Y-W)
rp[3] = Rect(r.Max.X-W, r.Min.Y+W, r.Max.X, r.Max.Y-W)
return rp
}
func SweepRect(but int, mc *Mousectl) Rectangle {
but = 1 << (but - 1)
mc.Display.SwitchCursor(&sweep)
for mc.Buttons != 0 {
mc.Read()
}
for mc.Buttons&but == 0 {
mc.Read()
if mc.Buttons&(7^but) != 0 {
for mc.Buttons != 0 {
mc.Read()
}
return ZR
}
}
r := Rectangle{Min: mc.Point, Max: mc.Point}
var rc Rectangle
for {
rc = r.Canon()
drawgetrect(mc.Display, rc, true)
mc.Read()
drawgetrect(mc.Display, rc, false)
r.Max = mc.Point
if mc.Buttons != but {
break
}
}
mc.Display.SwitchCursor(nil)
if mc.Buttons&(7^but) != 0 {
rc = ZR
for mc.Buttons != 0 {
mc.Read()
}
}
return rc
}
func freegrtmp() {
grTmp[0].Free()
grTmp[1].Free()
grTmp[2].Free()
grTmp[3].Free()
grRed.Free()
grTmp = [4]*Image{}
grRed = nil
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
func drawgetrect(display *Display, rc Rectangle, up bool) {
screen := display.ScreenImage
/*
* BUG: if for some reason we have two of these going on at once
* when we must grow the tmp buffers, we lose data. Also if tmp
* is unallocated and we ask to restore the screen, it would be nice
* to complain, but we silently make a mess.
*/
if up && grTmp[0] != nil {
if grTmp[0].R.Dx() < rc.Dx() || grTmp[2].R.Dy() < rc.Dy() {
freegrtmp()
}
}
if grTmp[0] == nil {
const W = BorderWidth
r := Rect(0, 0, max(screen.R.Dx(), rc.Dx()), W)
grTmp[0], _ = display.AllocImage(r, screen.Pix, false, White)
grTmp[1], _ = display.AllocImage(r, screen.Pix, false, White)
r = Rect(0, 0, W, max(screen.R.Dy(), rc.Dy()))
grTmp[2], _ = display.AllocImage(r, screen.Pix, false, White)
grTmp[3], _ = display.AllocImage(r, screen.Pix, false, White)
grRed, _ = display.AllocImage(Rect(0, 0, 1, 1), screen.Pix, true, Red)
if grTmp[0] == nil || grTmp[1] == nil || grTmp[2] == nil || grTmp[3] == nil || grRed == nil {
freegrtmp()
log.Fatalf("getrect: allocimage failed")
}
}
rects := brects(rc)
if !up {
for i := 0; i < 4; i++ {
screen.Draw(rects[i], grTmp[i], nil, ZP)
}
return
}
for i := 0; i < 4; i++ {
grTmp[i].Draw(Rect(0, 0, rects[i].Dx(), rects[i].Dy()), screen, nil, rects[i].Min)
screen.Draw(rects[i], grRed, nil, ZP)
}
}