如何使自定义画笔在Android的印刷品吗？ [英] How to make custom brush for canvas in android?

问题描述

在我的画布应用程序，我想使用自定义画笔一样附着刷image.so请别人帮我快，我怎么能自定义画笔一样附着的形象？

In my canvas application i want to use custom brushes like brushes in attached image.so please somebody help me fast how can i make custom brushes like attached image?

在我的应用程序使用我下面code发点线：

In my app i made doted line using following code:

 mPaint.setPathEffect(new DashPathEffect(new float[] { 8, 8 }, 0));

和获得使用下面的code模糊和浮雕效果：

and getting Blur and Emboss effect using following code:

 mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 }, 0.4f, 6, 3.5f);

 mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);

推荐答案

正如你可以清楚地看到，没有琐碎的着色效果/矩形/圆圈可以做到这一点。 图像/位图使用。

As you can clearly see, no trivial shader effects / rectangles / circles can accomplish this. Images / Bitmaps are used.

所以，简单地重复使用位图绘制 canvas.drawBitmap 。你一次又一次地得出同样的位图，而手指的移动。

So simply repeatedly draw Bitmaps using canvas.drawBitmap. You draw the same Bitmap again and again while the finger moves.

有关添加自定义颜色，您可以添加一个简单的过滤器。

For adding a custom color you can add a simple filter.

public class CanvasBrushDrawing extends View {
    private Bitmap mBitmapBrush;
    private Vector2 mBitmapBrushDimensions;

    private List<Vector2> mPositions = new ArrayList<Vector2>(100);

    private static final class Vector2 {
        public Vector2(float x, float y) {
            this.x = x;
            this.y = y;
        }

        public final float x;
        public final float y;
    }

    public CanvasBrushDrawing(Context context) {
        super(context);

// load your brush here
        mBitmapBrush = BitmapFactory.decodeResource(context.getResources(), R.drawable.splatter_brush);
        mBitmapBrushDimensions = new Vector2(mBitmapBrush.getWidth(), mBitmapBrush.getHeight());

        setBackgroundColor(0xffffffff);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        for (Vector2 pos : mPositions) {
            canvas.drawBitmap(mBitmapBrush, pos.x, pos.y, null);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        int action = event.getAction();
        switch (action) {
        case MotionEvent.ACTION_MOVE:
            final float posX = event.getX();
            final float posY = event.getY();
            mPositions.add(new Vector2(posX - mBitmapBrushDimensions.x / 2, posY - mBitmapBrushDimensions.y / 2));
            invalidate();
        }

        return true;
    }
}

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