Java Graphics.getGlobalAlpha方法代码示例

import net.rim.device.api.ui.Graphics; //导入方法依赖的package包/类
public void setClip(Object graphics, int x, int y, int width, int height) {
    Graphics g = (net.rim.device.api.ui.Graphics) graphics;
    net.rim.device.api.ui.Font oldFont = g.getFont();
    int oldColor = g.getColor();
    int oldAlpha = g.getGlobalAlpha();
    while (g.getContextStackSize() > 1) {
        g.popContext();
    }
    g.pushRegion(x, y, width, height, 0, 0);
    g.translate(-g.getTranslateX(), -g.getTranslateY());
    /**
     * applying a clip will automatically
     * reset some information that we need to keep track of
     * manually (it seems).
     */
    g.setFont(oldFont == null ? (net.rim.device.api.ui.Font) getDefaultFont() : oldFont);
    g.setColor(oldColor);
    g.setGlobalAlpha(oldAlpha);
}
 

import net.rim.device.api.ui.Graphics; //导入方法依赖的package包/类
public static void drawAlphaGradientString(
        String text, Graphics g, int x, int y, boolean toRight) {
    int oldAlpha = g.getGlobalAlpha();
    try {
        int dx = 0, currentAlpha = toRight ? 255 : 55;
        int step = (toRight ? -1 : 1) * 200 / text.length();
        for (int i = 0; i < text.length(); ++i) {
            char c = text.charAt(i);
            g.setGlobalAlpha(currentAlpha);
            g.drawText("" + c, x + dx, y);
            dx += g.getFont().getAdvance(c);
            currentAlpha += step;
        }
    } finally {
        g.setGlobalAlpha(oldAlpha);
    }
}
 

import net.rim.device.api.ui.Graphics; //导入方法依赖的package包/类
protected void paint(Graphics g) {
    if (bitmap != null) {
        bitmap.draw(g, 0, 0, getContentWidth(), getContentHeight());
    } else if (defaultBitmap != null) {
        defaultBitmap.draw(g, 0, 0, getContentWidth(), getContentHeight());
    }
    if (text != null) {
        int h = R.px(10);

        int oldAlpha = g.getGlobalAlpha();
        int oldColor = g.getColor();

        g.setGlobalAlpha(150);
        g.fillRect(0, getContentHeight() - h, getContentWidth(), h);
        g.setGlobalAlpha(200);
        g.setColor(0xEEEEEE);
        g.drawText(text, getContentWidth() / 2, getContentHeight() - h / 2, DrawStyle.HCENTER);

        g.setGlobalAlpha(oldAlpha);
        g.setColor(oldColor);
    }
}
 

import net.rim.device.api.ui.Graphics; //导入方法依赖的package包/类
public Object createMutableImage(int width, int height, int fillColor) {
    Bitmap b = new Bitmap(width, height);
    Graphics g = new Graphics(b);
    if ((fillColor & 0xff000000) != 0xff000000) {
        g.setColor(fillColor & 0xffffff);
        int oldAlpha = g.getGlobalAlpha();
        g.setGlobalAlpha((fillColor >> 24) & 0xff);
        g.clear();
        g.setGlobalAlpha(oldAlpha);
    } else {
        g.setColor(fillColor & 0xffffff);
        g.fillRect(0, 0, width, height);
    }
    return b;
}
 

import net.rim.device.api.ui.Graphics; //导入方法依赖的package包/类
protected void paint(Graphics g) {
    int oldColor = g.getColor();
    int oldAlpha = g.getGlobalAlpha();

    int height = getContentHeight(), width = getContentWidth();

    int color = getTheme().getPrimaryColor();
    if (isFocused() || isActive()) {
        color = getTheme().getSecondaryFontColor();
    }

    try {
        Font f = PaneCaptionField.font;

        int y = (height - f.getHeight()) / 2;

        int centerX = width / 2 - dx;

        g.setGlobalAlpha(255);
        g.setFont(f);
        g.setColor(color);

        int curX = centerX;
        for (int i = 0; i < titles.size(); ++i) {
            String t = (String) titles.elementAt(i);
            int x = curX - f.getAdvance(t) / 2;

            if (i < current) {
                TextDrawHelper.drawAlphaGradientString(t, g, x, y, true);
            } else if (i > current) {
                TextDrawHelper.drawAlphaGradientString(t, g, x, y, false);
            } else {
                g.drawText(t, x, y);
            }
            curX += width / 2;
            if (curX > width) {
                break;
            }
        }
    } finally {
        g.setColor(oldColor);
        g.setGlobalAlpha(oldAlpha);
    }
}