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utility.go
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utility.go
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package main
import (
"database/sql"
"fmt"
"image"
"io"
"log"
"math"
"os"
"strings"
"time"
)
// exists returns whether the given file or directory exists or not
func exists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return true, err
}
// isDir returns whether given path is a directory
func isDir(path string) (bool, error) {
fi, err := os.Stat(path)
if err != nil {
return false, err
}
switch mode := fi.Mode(); {
case mode.IsDir():
return true, nil
}
return false, nil
}
//https://stackoverflow.com/a/21067803
// copyFileContents copies the contents of the file named src to the file named
// by dst. The file will be created if it does not already exist. If the
// destination file exists, all it's contents will be replaced by the contents
// of the source file.
func copyFileContents(src, dst string) (err error) {
in, err := os.Open(src)
if err != nil {
return
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return
}
defer func() {
cerr := out.Close()
if err == nil {
err = cerr
}
}()
if _, err = io.Copy(out, in); err != nil {
return
}
err = out.Sync()
return
}
//Return local photo path for SaveImageType
func photoPath(slide Slide) (photoFilename string) {
var photoDirectory string
switch slide.SaveType {
case SAVE_IMAGE_TRAINING:
photoDirectory = IMAGE_TRAINING_DIRECTORY
//Set special initial DEBUG training directory if training manual file
if DEBUG_MANUAL_IMAGE_FILE_TARGET {
photoDirectory = DEBUG_MANUAL_IMAGE_FILE_TARGET_TRAINING_DIRECTORY
}
break
case SAVE_IMAGE_TRAINING_PROCESSED_BLACK:
photoDirectory = IMAGE_TRAINING_PROCESSED_DIRECTORY_BLACK
break
case SAVE_IMAGE_TRAINING_PROCESSED_WHITE:
photoDirectory = IMAGE_TRAINING_PROCESSED_DIRECTORY_WHITE
break
default:
log.Println("Unknown save type ", slide.SaveType)
}
var suffix string
if len(slide.Suffix) > 0 {
suffix = fmt.Sprintf("_%v", slide.Suffix)
}
//prefixterminal_title_n_suffix.png
strippedTerminalTitle := strings.Replace(strings.ToLower(slide.Terminal.Title), " ", "_", -1)
photoFilename = fmt.Sprintf("%v_%v%v.%v", strippedTerminalTitle, slide.FBNodeId, suffix, slide.Extension)
//DEBUG Override terminal+slide specific filename for DEBUG_MANUAL_FILENAME if DEBUG_MANUAL_IMAGE_FILE_TARGET is true
if DEBUG_MANUAL_IMAGE_FILE_TARGET {
extensionIndex := strings.LastIndex(DEBUG_MANUAL_FILENAME, ".")
if extensionIndex == -1 {
photoFilename = DEBUG_MANUAL_FILENAME
} else {
photoFilename = DEBUG_MANUAL_FILENAME[:extensionIndex] + suffix + DEBUG_MANUAL_FILENAME[extensionIndex:]
}
}
photoFilename = fmt.Sprintf("%v/%v", photoDirectory, photoFilename)
return
}
//Returns the closer time.Time to the target time.Time of two time.Time
func closerDate(target time.Time, one time.Time, two time.Time) (closerDate time.Time) {
if math.Abs(float64(target.Sub(one))) < math.Abs(float64(target.Sub(two))) {
closerDate = one
} else {
closerDate = two
}
return
}
//Return int vertical distance between two image.Rectangle. Return negative distance if Rectangles intersect.
func getVerticalDistance(bbox1 image.Rectangle, bbox2 image.Rectangle) (verticalDistance int) {
/*
* ***
* *2*
* ***
* |
* ***
* *1*
* ***
*/
if bbox1.Min.Y >= bbox2.Max.Y {
verticalDistance = bbox1.Min.Y - bbox2.Max.Y
return
}
/*
* ***
* *1*
* ***
* |
* ***
* *2*
* ***
*/
if bbox1.Max.Y <= bbox2.Min.Y {
verticalDistance = bbox2.Min.Y - bbox1.Max.Y
return
}
//Boxes overlap. Return negative distance.
if bbox1.Min.Y >= bbox2.Min.Y {
/*
* ***
* *2*
* ***` | * *
* *1* | * *
* *** | * *
* ***
*
*/
/*
* ***
* *2*
* ***` | * *
* *1* | ***
* * *
* ***
*
*/
if bbox1.Max.Y <= bbox2.Max.Y {
verticalDistance = -1 * bbox1.Dy()
return
} else {
verticalDistance = bbox1.Min.Y - bbox2.Max.Y
return
}
} else {
/*
* ***
* *1*
* * *` | ***
* * * | *2*
* * * | ***
* ***
*
*/
/*
* ***
* *1*
* * *` | ***
* *** | *2*
* * *
* ***
*
*/
if bbox1.Max.Y >= bbox2.Max.Y {
verticalDistance = -1 * bbox2.Dy()
return
} else {
verticalDistance = bbox2.Min.Y - bbox1.Max.Y
return
}
}
log.Fatal("No category matched ", bbox1, bbox2)
return
}
func (sReference Slide) getImageConfig() (im image.Config, err error) {
//find original dimensions
originalSavePath := photoPath(sReference)
var reader *os.File
if reader, err = os.Open(originalSavePath); err != nil {
return
}
//load image
defer reader.Close()
if im, _, err = image.DecodeConfig(reader); err != nil {
return
}
return
}
//Check whether two bounding boxes share > DUPLICATE_AREA_THRESHOLD of the smaller box's height on the same horizontal line.
func sameHorizontalLine(bbox1 image.Rectangle, bbox2 image.Rectangle) (horizontalDuplicate bool) {
smallerHeight := bbox1.Dy()
if bbox2.Dy() < smallerHeight {
smallerHeight = bbox2.Dy()
}
if bbox1.Min.Y >= bbox2.Min.Y && float64(bbox2.Max.Y-bbox1.Min.Y) > float64(smallerHeight)*DUPLICATE_AREA_THRESHOLD {
horizontalDuplicate = true
return
}
if bbox2.Min.Y >= bbox1.Min.Y && float64(bbox1.Max.Y-bbox2.Min.Y) > float64(smallerHeight)*DUPLICATE_AREA_THRESHOLD {
horizontalDuplicate = true
return
}
return
}
//Return true if Y coordinate is less/greater than a certain percentage of slide image height. True = lteq. False = greater
func (sReference Slide) isYCoordinateWithinHeightPercentage(yCoord int, maxPercentage float64) (valid bool, err error) {
var im image.Config
if im, err = sReference.getImageConfig(); err != nil {
return
}
if float64(yCoord) > float64(im.Height)*maxPercentage {
valid = false
} else {
valid = true
}
return
}
//Check *(sql.DB) handle initialized and connected
func checkDatabaseHandleValid(targetHandle *(sql.DB)) (err error) {
if db == nil {
err = fmt.Errorf("DB handle is nil")
return
}
if err = db.Ping(); err != nil {
err = fmt.Errorf("DB ping failed.")
return
}
return
}