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examples/drag: Bug fix: nil error

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Fixes #612
This commit is contained in:
Hajime Hoshi 2018-05-14 00:06:03 +09:00
parent b9cd7afff5
commit a92cc0f4b3
1 changed files with 8 additions and 4 deletions
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12
examples/drag/main.go
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@ -287,20 +287,24 @@ func (g *Game) update(screen *ebiten.Image) error {
return nil
}
movingSprites := map[*Sprite]struct{}{}
draggingSprites := map[*Sprite]struct{}{}
for s := range g.strokes {
movingSprites[s.DraggingObject().(*Sprite)] = struct{}{}
if sprite := s.DraggingObject().(*Sprite); sprite != nil {
draggingSprites[sprite] = struct{}{}
}
}
for _, s := range g.sprites {
if _, ok := movingSprites[s]; ok {
if _, ok := draggingSprites[s]; ok {
continue
}
s.Draw(screen, 0, 0, 1)
}
for s := range g.strokes {
dx, dy := s.PositionDiff()
s.DraggingObject().(*Sprite).Draw(screen, dx, dy, 0.5)
if sprite := s.DraggingObject().(*Sprite); sprite != nil {
sprite.Draw(screen, dx, dy, 0.5)
}
}
ebitenutil.DebugPrint(screen, "Drag & Drop the sprites!")