问使用可变的帧大小动态地将精灵工作表切割成单独的位图

EN

// Indirect Variable Sets (Sprite Animation and Sprite Sheet Cuts)
    framesPerRow = frameCount/spriteSheetRows;
    spriteWidth = bmp.getWidth() / framesPerRow;    // cut the sheet into pieces based on 
                                                    // sprite width: frames/row ratio
    spriteHeight = bmp.getHeight()/spriteSheetRows; // cut the sheet horizontally into pieces based on
                                                    // total height : total rows ratio

    setSourceRect(new Rect(0, 0, spriteWidth, spriteHeight));
    setFramePeriod(1000 / fps);                     // set the framePeriod based on desired fps

public void update(long gameTimeInMillis){
    // If the game time has been longer than the frame period...
    // the reason that we need frameTicker is so that we can use our variable (frameTicker)
    // to keep track of the last time that the frame was updated (relative to our game)
    if (gameTimeInMillis > frameTicker + framePeriod){
        frameTicker = gameTimeInMillis;             // set last update time (current time)
        // increment the animation frame
        currentFrame++;

        // Get current column in sprite sheet:
        // this works like this, imagine we are at frame 20, and we have 5 frames per row
        // 20%5 = 0 so we are at the end of the row, if we are at frame 22, 22%5 = 2, etc.
        frameColumn = currentFrame%framesPerRow;

        // if we are at our max frame count (note, we start at 0) then reset our animation
        if(currentFrame >= frameCount){ 
            currentFrame = 0;                   
        }

        // increment the sprite sheet row if we are at the end of the row
        if(frameColumn == 0){
            currentRow++;
        }

        // if we are at our max rows (note, we start at 0) then reset our animation rows
        if(currentRow >= spriteSheetRows){
            currentRow = 0;
        }

        // define the "cookie cutter" sourceRectangle for our sprite sheet
        this.sourceRect.left = frameColumn * spriteWidth;
        this.sourceRect.right = this.sourceRect.left + spriteWidth;
        this.sourceRect.top = currentRow * spriteHeight;
        this.sourceRect.bottom = this.sourceRect.top + spriteHeight;
        Log.d(TAG, "Top coordinates = " + currentRow);
    }
}