Golang Surface.Flip方法代碼示例

func undrawColor(ss *sdl.Surface, w, h int32, col uint32) {

	var x, y int32
	for y = 0; y < h; y++ {
		for x = 0; x < w; x++ {
			col := sdlGet(x, y, ss) & (^col)
			sdlSet2(x, y, col, ss)
		}
	}
	ss.Flip()
}

// Set distance of nearby points (from point ax,ay -> bx,by) in given dir (0=N,
// 1=S, 2=E, 3=W)
func setDist(ss *sdl.Surface, rmc [][]int32, dist [][][]int32, aX, aY, bX, bY, dir, w, h, r, currBestDist, lastSetX, lastSetY int32, done, found bool, round int) (newDone, newFound bool, newBest int32, setX, setY int32) {

	newDone, newFound, newBest, setX, setY = done, found, currBestDist, lastSetX, lastSetY

	if !inRect(bX, bY, w, h) {
		return
	}

	dA := dist[aX][aY]
	_, best := bestDist(dA)
	best += 4 * (r + 1) * (r + 1)

	if best >= currBestDist { // we alredy have better distance (smaller is better)
		return
	}

	dB := dist[bX][bY]
	rmCount := removeCount(ss, rmc, w, h, bX, bY, r)

	if currBestDist == DistMax && rmCount > 0 && best < DistMax {
		//fmt.Printf("==== found rmCount=%d best=%d bX=%d bY=%d\n", rmCount, best, bX, bY)
		newBest = best
		newFound = true
	}

	//fmt.Printf("setDist aX=%d aY=%d bX=%d bY=%d rmCount=%d\n", aX, aY, bX, bY, rmCount)

	if best < dB[dir] && rmCount != -1 { // part of model would be removed
		if aX&7 == 0 && aY&7 == 0 {
			if round > 20 {
				fmt.Printf("setDist x=%d y=%d value=%d dB[dir]=%d\n", aX, aY, best, dB[dir])
			}
			sdlSet(aX, aY, ColDebug, ss)
			if aX&63 == 0 && aY&63 == 0 {
				ss.Flip()
			}
		}
		dB[dir] = best - rmCount // favourize paths that remove more material
		newDone = false
		setX, setY = bX, bY
	}
	return
}

//.........這裏部分代碼省略.........
	}

	dstMin := DistMax
	tX, tY := int32(-1), int32(-1)
	removed := false
	for x, y, a, ok := nearRectBegin(cX, cY, w, h, 1); ok; x, y, a, ok = nearRectNext(cX, cY, x, y, a, w, h) {

		if removeCount(ss, rmc, w, h, x, y, r) <= 0 {
			continue
		}
		removed = true
		dst := DistMax
		if found {
			_, dst = bestDist(dist[x][y])
		} else {
			dst = abs32(cX-x) + abs32(cY-y)
		}
		if dst < dstMin {
			dstMin, tX, tY = dst, x, y
		}
	}

	fmt.Printf("removed=%t found=%t dstMin=%d tX=%d tY=%d\n", removed, found, dstMin, tX, tY)

	if !removed {
		return false, false, tX, tY
	}
	if !found {
		return true, false, tX, tY
	}

	var dirs []int

	for x, y := tX, tY; x != cX || y != cY; {

		dir, _ := bestDist(dist[x][y])

		dirs = append(dirs, dir)
		if dir == dir_N {
			y--
		} else if dir == dir_S {
			y++
		} else if dir == dir_E {
			x++
		} else if dir == dir_W {
			x--
		} else if dir == dir_NW {
			x, y = x-1, y-1
		} else if dir == dir_NE {
			x, y = x+1, y-1
		} else if dir == dir_SW {
			x, y = x-1, y+1
		} else if dir == dir_SE {
			x, y = x+1, y+1
		}

		/*fmt.Printf(" N  S  E  W  NW NE SE SW|  N  S  E  W  NW NE SE SW|  N  S  E  W  NW NE SE SW|  N  S  E  W  NW NE SE SW|  N  S  E  W  NW NE SE SW\n")
				for i := y - 3; i <= y+3; i++ {
					for j := x - 3; j <= x+3; j++ {
						if !inRect(i, j, w, h) {
							continue
						}
						dumpDists(dist[j][i])
						fmt.Printf("| ")
					}
					fmt.Println()
				}
				fmt.Printf("x=%d y=%d dir=%d bestDist=%d\n", x, y, dir, dst)
		        fmt.Scanln()*/
	}

	for x, y, i := cX, cY, len(dirs)-1; i >= 0; i-- {
		dir := dirs[i]
		if dir == dir_N {
			y++
		} else if dir == dir_S {
			y--
		} else if dir == dir_E {
			x--
		} else if dir == dir_W {
			x++
		} else if dir == dir_NW {
			x, y = x+1, y+1
		} else if dir == dir_NE {
			x, y = x-1, y+1
		} else if dir == dir_SW {
			x, y = x+1, y-1
		} else if dir == dir_SE {
			x, y = x-1, y-1
		}
		//fmt.Printf("cX=%d cY=%d tX=%d tY=%d x=%d y=%d\n", cX, cY, tX, tY, x, y)
		moveXy(tc, x, y, r, removeCount(ss, rmc, w, h, x, y, r))
		removeMaterial(ss, rmc, w, h, x, y, r)
		sdlSet(x, y, ColDebug, ss)
		ss.Flip()
		//fmt.Scanln()
	}

	return true, true, tX, tY
}