Ilia Denisov
122 lines
2.4 KiB
Go
122 lines
2.4 KiB
Go
package bitmap
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import (
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"fmt"
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"math"
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)
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const intSize = 32
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type bitmap struct {
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width uint32
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height uint32
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bitVector []uint32
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}
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func NewBitmap(width uint32, height uint32) bitmap {
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return bitmap{width: width, height: height, bitVector: make([]uint32, int(math.Ceil(float64(width*height)/intSize)))}
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}
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func (p bitmap) Set(x, y int) {
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boundX := (p.width + uint32(x)) % p.width
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boundY := (p.height + uint32(y)) % p.height
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p.set(boundX + boundY*p.width)
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}
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func (p bitmap) set(number uint32) {
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p.bitVector[number/intSize] |= (0b1 << (number % intSize))
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}
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func (p bitmap) IsSet(x, y int) bool {
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return p.isSet(uint32(x) + uint32(y)*p.width)
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}
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func (p bitmap) isSet(number uint32) bool {
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return p.bitVector[number/intSize]&(0b1<<(number%intSize)) > 0
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}
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func (p bitmap) Circle(x, y int, r float64) {
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plotX := 0
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plotY := int(math.Ceil(r))
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delta := 3 - 2*plotY
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lastY := plotY
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for plotX <= plotY {
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p.octant(x, y, plotX, plotY)
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if plotY < lastY {
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for lineX := 0; lineX < plotX; lineX++ {
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p.octant(x, y, lineX, plotY)
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}
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lastY = plotY
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}
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if delta < 0 {
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delta += 4*plotX + 6
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} else {
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delta += 4*(plotX-plotY) + 10
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plotY -= 1
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}
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plotX += 1
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}
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for fillX := 0; fillX < plotX; fillX++ {
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for fillY := 0; fillY <= fillX; fillY++ {
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p.octant(x, y, fillX, fillY)
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}
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}
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}
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func (p bitmap) CircleAdjacent(x, y int, r float64) {
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plotX := 0
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plotY := int(math.Ceil(r))
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delta := 1 - 2*plotY
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err := 0
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for plotX <= plotY {
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p.octant(x, y, plotX, plotY)
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err = 2*(delta+plotY) - 1
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if delta < 0 && err <= 0 {
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plotX += 1
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delta += 2*plotX + 1
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continue
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}
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if delta > 0 && err > 0 {
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plotY -= 1
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delta -= 2*plotY + 1
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continue
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}
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plotX += 1
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plotY -= 1
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delta += 2 * (plotX - plotY)
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}
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}
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func (p bitmap) octant(x, y int, plotX, plotY int) {
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p.Set(x+plotX, y+plotY)
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p.Set(x+plotX, y-plotY)
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p.Set(x-plotX, y+plotY)
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p.Set(x-plotX, y-plotY)
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p.Set(x+plotY, y+plotX)
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p.Set(x+plotY, y-plotX)
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p.Set(x-plotY, y+plotX)
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p.Set(x-plotY, y-plotX)
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}
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func (p bitmap) Clear() {
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for i := range p.bitVector {
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p.bitVector[i] &= 0
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}
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}
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func (p bitmap) String() string {
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px := map[bool]string{true: "██", false: "░░"}
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var result string
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cnt := 0
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for i := 0; i < len(p.bitVector); i++ {
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for bit := 0; bit < intSize && cnt < int(p.width*p.height); bit++ {
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result += fmt.Sprintf("%s", px[p.bitVector[i]&(0b1<<bit) > 0])
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cnt++
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if cnt%int(p.width) == 0 {
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result += "\n"
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}
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}
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}
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return result
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}
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