Examples with Canvas android.graphics.Canvas used on opensource projects

Example 16 with Canvas

use of android.graphics.Canvas in project TwinklingRefreshLayout by lcodecorex.

the class CircleImageView method getBitmapFromDrawable.

private Bitmap getBitmapFromDrawable(Drawable drawable) {
    if (drawable == null) {
        return null;
    }
    if (drawable instanceof BitmapDrawable) {
        return ((BitmapDrawable) drawable).getBitmap();
    }
    try {
        Bitmap bitmap;
        if (drawable instanceof ColorDrawable) {
            bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
        } else {
            if (!(drawable.getIntrinsicWidth() > 0) || !(drawable.getIntrinsicHeight() > 0)) {
                bitmap = Bitmap.createBitmap(DensityUtil.dip2px(getContext(), 40), DensityUtil.dip2px(getContext(), 40), BITMAP_CONFIG);
            } else {
                bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);
            }
        }
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return bitmap;
    } catch (OutOfMemoryError e) {
        return null;
    }
}

Example 17 with Canvas

use of android.graphics.Canvas in project Lazy by l123456789jy.

the class BitmapUtil method saturation.

/**
     * 饱和度处理
     *
     * @param bitmap          原图
     * @param saturationValue 新的饱和度值
     * @return 改变了饱和度值之后的图片
     */
public static Bitmap saturation(Bitmap bitmap, int saturationValue) {
    // 计算出符合要求的饱和度值
    float newSaturationValue = saturationValue * 1.0F / 127;
    // 创建一个颜色矩阵
    ColorMatrix saturationColorMatrix = new ColorMatrix();
    // 设置饱和度值
    saturationColorMatrix.setSaturation(newSaturationValue);
    // 创建一个画笔并设置其颜色过滤器
    Paint paint = new Paint();
    paint.setColorFilter(new ColorMatrixColorFilter(saturationColorMatrix));
    // 创建一个新的图片并创建画布
    Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(newBitmap);
    // 将原图使用给定的画笔画到画布上
    canvas.drawBitmap(bitmap, 0, 0, paint);
    return newBitmap;
}

Example 18 with Canvas

use of android.graphics.Canvas in project Lazy by l123456789jy.

the class CreatQRCodeImg method addLogo.

/**
     * 在二维码中间添加Logo图案
     */
private static Bitmap addLogo(Bitmap src, Bitmap logo) {
    if (src == null) {
        return null;
    }
    if (logo == null) {
        return src;
    }
    //获取图片的宽高
    int srcWidth = src.getWidth();
    int srcHeight = src.getHeight();
    int logoWidth = logo.getWidth();
    int logoHeight = logo.getHeight();
    if (srcWidth == 0 || srcHeight == 0) {
        return null;
    }
    if (logoWidth == 0 || logoHeight == 0) {
        return src;
    }
    //logo大小为二维码整体大小的1/5
    float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;
    Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
    try {
        Canvas canvas = new Canvas(bitmap);
        canvas.drawBitmap(src, 0, 0, null);
        canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
        canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);
        canvas.save(Canvas.ALL_SAVE_FLAG);
        canvas.restore();
    } catch (Exception e) {
        bitmap = null;
        e.getStackTrace();
    }
    return bitmap;
}

Example 19 with Canvas

use of android.graphics.Canvas in project Lazy by l123456789jy.

the class ImageProcessor method lumAndHueAndSaturation.

/**
     * 亮度、色相、饱和度处理
     * @param lumValue 亮度值
     * @param hueValue 色相值
     * @param saturationValue 饱和度值
     * @return 亮度、色相、饱和度处理后的图片
     */
public Bitmap lumAndHueAndSaturation(int lumValue, int hueValue, int saturationValue) {
    //计算出符合要求的饱和度值
    float newSaturationValue = saturationValue * 1.0F / 127;
    //计算出符合要求的亮度值
    float newlumValue = lumValue * 1.0F / 127;
    //计算出符合要求的色相值
    float newHueValue = (hueValue - 127) * 1.0F / 127 * 180;
    //创建一个颜色矩阵并设置其饱和度
    ColorMatrix colorMatrix = new ColorMatrix();
    //设置饱和度值
    colorMatrix.setSaturation(newSaturationValue);
    //设置亮度值
    colorMatrix.setScale(newlumValue, newlumValue, newlumValue, 1);
    // 控制让红色区在色轮上旋转的角度
    colorMatrix.setRotate(0, newHueValue);
    // 控制让绿红色区在色轮上旋转的角度
    colorMatrix.setRotate(1, newHueValue);
    // 控制让蓝色区在色轮上旋转的角度
    colorMatrix.setRotate(2, newHueValue);
    //创建一个画笔并设置其颜色过滤器
    Paint paint = new Paint();
    paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
    //创建一个新的图片并创建画布
    Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(newBitmap);
    //将原图使用给定的画笔画到画布上
    canvas.drawBitmap(bitmap, 0, 0, paint);
    return newBitmap;
}

Example 20 with Canvas

use of android.graphics.Canvas in project Lazy by l123456789jy.

the class ImageProcessor method saturation.

/**
     * 饱和度处理
     * @param saturationValue 新的饱和度值
     * @return 改变了饱和度值之后的图片
     */
public Bitmap saturation(int saturationValue) {
    //计算出符合要求的饱和度值
    float newSaturationValue = saturationValue * 1.0F / 127;
    //创建一个颜色矩阵
    ColorMatrix saturationColorMatrix = new ColorMatrix();
    //设置饱和度值
    saturationColorMatrix.setSaturation(newSaturationValue);
    //创建一个画笔并设置其颜色过滤器
    Paint paint = new Paint();
    paint.setColorFilter(new ColorMatrixColorFilter(saturationColorMatrix));
    //创建一个新的图片并创建画布
    Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(newBitmap);
    //将原图使用给定的画笔画到画布上
    canvas.drawBitmap(bitmap, 0, 0, paint);
    return newBitmap;
}