// Append simply adds an image from the aggregate to the end of our animation
func (f *FrameAnimation) Append(imageLoc string) {
img, err := Image.NewImage(imageLoc)
if err != nil {
Logging.Debug("Cannot create image: " + err.Error())
}
f.animationImages = append(f.animationImages, &img)
}
// SetImage puts a designated image from the agregate into our image which will be rendered
func (s *SpriteRenderer) SetImage(imageLoc string) {
img, err := Image.NewImage(imageLoc)
if err != nil {
Logging.Debug("Cannot create image: " + err.Error())
}
s.img = &img
}
// SetSubImage sets a designated part of an image for this sprite renderer
// @param {[string]} this *SpriteRenderer [the base image path]
// @param {[image.Rectangle]} this *SpriteRenderer [the rectangular bounds of designated part of image]
// @return
func (s *SpriteRenderer) SetSubImage(imageLoc string, bounds image.Rectangle) {
img, err := Image.NewImage(imageLoc)
if err != nil {
Logging.Debug("Cannot create image: " + err.Error())
}
img, err = img.SubImage(bounds)
if err != nil {
Logging.Debug("Cannot create sub image: " + err.Error())
}
s.img = &img
}
// SpliceSpriteSheetAnimation manually cuts up a row of a sprite sheet based on user defined dimensions and sets it as the current animation
func SpliceSpriteSheetAnimation(imageLoc string,
frameWidth, frameHeight, noOfFrames, rowNum int) *FrameAnimation {
fa := newFrameAnimation()
img, err := Image.NewImage(imageLoc)
if err != nil {
Logging.Debug("Cannot create image: " + err.Error())
}
// throw warnings for bad input
numOfRows := float32(img.Bounds().Dy() / frameHeight)
numOfColumns := float32(img.Bounds().Dx() / frameWidth)
if float32(noOfFrames) > numOfColumns || numOfColumns < 1 {
Logging.Debug("WARNING: frames out of bounds")
}
if float32(rowNum) > numOfRows || numOfRows < 1 {
Logging.Debug("WARNING: row desired out of bounds")
}
for j := 0; j < img.Bounds().Dy(); j += frameHeight {
// only use our desired row (if specified)
if rowNum != 0 && j/frameHeight != rowNum-1 {
continue
}
// splice the row by the amount of intended images
for i := 0; i < img.Bounds().Dx(); i += frameWidth {
// only grab our desired number of frames (if specified)
if noOfFrames != 0 && i/frameWidth >= noOfFrames {
continue
}
// splice image from row, and insert piece into array
b := image.Rect(i, j, i+frameWidth, j+frameHeight)
spriteSheetPart, err := img.SubImage(b)
if err != nil {
Logging.Debug("Cannot create sub image: " + err.Error())
}
fa.animationImages = append(fa.animationImages, &spriteSheetPart)
}
}
return fa
}