[英]Trying to mirror a picture with java android canvas.drawImage
我試圖用java android canvas.drawImage旋轉圖片時遇到問題。 我正在做一個小游戲,我正在使用我的drawImage函數在屏幕上繪制不同的圖片。 但是現在我想旋轉一些小圖像,我為此創建了一個名為drawMirroredImage的函數。 但是現在這些小圖像不會出現在同一個地方。
這是我的代碼:
public void drawImage(Image Image, int x, int y) {
canvas.drawBitmap(((AndroidImage) Image).bitmap, x, y, null);
}
public void drawMirroredImage(Image Image, int x, int y) {
canvas.save();
canvas.scale(-1.0f, 1.0f);
canvas.drawBitmap(((AndroidImage) Image).bitmap, x - canvas.getWidth(), y, null);
canvas.restore();
}
誰知道我做錯了什么?
非常感謝幫助
以下將為您服務。 我發現它本身就在SO本身,但不記得在哪里。
public static Bitmap getReflectionedBitmap(Context context,int resourceId,Bitmap originalImage,int reflectionGap) {
if(originalImage==null)
originalImage = BitmapFactory.decodeResource(context.getResources(),resourceId);
int width = originalImage.getWidth();
int height = originalImage.getHeight();
// This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
// Create a Bitmap with the flip matix applied to it.
// We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
height / 2, width, height / 2, matrix, false);
// Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height / 2), Config.ARGB_8888);
// Create a new Canvas with the bitmap that's big enough for
// the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
// Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
// Draw in the gap
Paint deafaultPaint = new Paint();
deafaultPaint.setColor(0xffffffff);
canvas.drawRect(0, height, width, height + reflectionGap , deafaultPaint);
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0,
originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
// Set the paint to use this shader (linear gradient)
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
return bitmapWithReflection;
}
我稍微調整了片段,以便將它與資源圖像一起使用。
如果要為資源中的圖像創建反射,則將null
作為參數代替Bitmap
。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.