Android - Canvas drawLine在ImageView中

时间:2011-12-09 11:58:12

标签: android bitmap android-imageview android-canvas

我有一个ImageView,我想画一条线。我做了以下事情:

mImagenCampo = (ImageView) findViewById(R.id.imagen_campo); 

crearPunto(mArea9M, mPaloIzq,v.getWidth(), mPaloIzq,Color.WHITE);

功能是:

private void crearPunto(float x, float y, float xend, float yend, int color) {

    BitmapDrawable bmpDraw = (BitmapDrawable) mImagenCampo.getDrawable();
    Bitmap bmp = bmpDraw.getBitmap().copy(Config.RGB_565, true);
    Canvas c = new Canvas(bmp);
    Paint p = new Paint();
    p.setColor(color);
    c.drawLine(x, y, xend, yend, p);
    mImagenCampo.setImageBitmap(bmp);

}

我的问题是绘制了这条线,但它没有获得权限坐标。它被绘制得比应该的小。

由于

编辑:我忘了说 mImagenCampo 是一个ImageView

1 个答案:

答案 0 :(得分:16)

试试这个:

private void crearPunto(float x, float y, float xend, float yend, int color) {

    bmp = Bitmap.createBitmap(mImagenCampo.getWidth(), mImagenCampo.getHeight(), Config.ARGB_8888);
    c = new Canvas(bmp);
        mImagenCampo.draw(c);

    Paint p = new Paint();
    p.setColor(color);
    c.drawLine(x, y, xend, yend, p);
    mImagenCampo.setImageBitmap(bmp);
}