java GUI冻结时,提请波从动画JPanel虽然我使用摆动计时器

f4t66c6m  于 2023-04-19  发布在  Java
关注(0)|答案(2)|浏览(126)

请看看我的代码片段,它是错的,它frrezes GUI时,Swing定时器统计是repeteadly油漆的jpnael??

class WaveformPanel extends JPanel {

        Timer graphTimer = null;
        AudioInfo helper = null;

        WaveformPanel() {
            setPreferredSize(new Dimension(200, 80));
            setBorder(BorderFactory.createLineBorder(Color.BLACK));
            graphTimer = new Timer(15, new TimerDrawing());
        }

        /**
         * 
         */
        private static final long serialVersionUID = 969991141812736791L;
        protected final Color BACKGROUND_COLOR = Color.white;
        protected final Color REFERENCE_LINE_COLOR = Color.black;
        protected final Color WAVEFORM_COLOR = Color.red;

        protected void paintComponent(Graphics g) {

            super.paintComponent(g);

            int lineHeight = getHeight() / 2;
            g.setColor(REFERENCE_LINE_COLOR);
            g.drawLine(0, lineHeight, (int) getWidth(), lineHeight);

            if (helper == null) {
                return;
            }

            drawWaveform(g, helper.getAudio(0));

        }

        protected void drawWaveform(Graphics g, int[] samples) {

            if (samples == null) {
                return;
            }

            int oldX = 0;
            int oldY = (int) (getHeight() / 2);
            int xIndex = 0;

            int increment = helper.getIncrement(helper
                    .getXScaleFactor(getWidth()));
            g.setColor(WAVEFORM_COLOR);

            int t = 0;

            for (t = 0; t < increment; t += increment) {
                g.drawLine(oldX, oldY, xIndex, oldY);
                xIndex++;
                oldX = xIndex;
            }

            for (; t < samples.length; t += increment) {
                double scaleFactor = helper.getYScaleFactor(getHeight());
                double scaledSample = samples[t] * scaleFactor;
                int y = (int) ((getHeight() / 2) - (scaledSample));
                g.drawLine(oldX, oldY, xIndex, y);

                xIndex++;
                oldX = xIndex;
                oldY = y;
            }
        }

        public void setAnimation(boolean turnon) {
            if (turnon) {
                graphTimer.start();
            } else {
                graphTimer.stop();
            }
        }

        class TimerDrawing implements ActionListener {

            @Override
            public void actionPerformed(ActionEvent e) {

                byte[] bytes = captureThread.getTempBuffer();

                if (helper != null) {
                    helper.setBytes(bytes);
                } else {
                    helper = new AudioInfo(bytes);
                }
                repaint();
            }
        }

    }

我从它的父类调用WaveFormPanel的setAnimation。当动画开始时,它不会绘制任何东西,但会冻结。请给予我解决方案。
感谢您的评分

tp5buhyn

tp5buhyn1#

java.swingx.TimerEDT中调用ActionPerformed。问题是,是什么花了时间来渲染。可能是对captureThread.getTempBuffer的调用,也可能是帮助的构造,但我怀疑这只是你试图绘制的数据量。
最近玩过这个,它需要相当多的时间来处理波形。
一个建议可能是减少你绘制的样本数量。而不是绘制每一个,也许根据组件的宽度每第二个或第四个样本点绘制一次。你应该仍然得到相同的jist,但没有所有的工作...

已更新

所有样本,2.18秒

每4个样本,0.711秒

每8个样本,0.450秒

也许您需要绘制响应批量数据的图形,而不是响应计时器的图形。
因为你的加载器线程有一个“大块”的数据,所以可以绘制它。
正如HoverCraftFullOfEels所建议的,您可以先将此绘制到BufferedImage,然后再将其绘制到屏幕上......
SwingWorker可以为您实现这一点

已更新

这是我用来绘制上述示例的代码。

// Samples is a 2D int array (int[][]), where the first index is the channel, the second is the sample for that channel
if (samples != null) {

    Graphics2D g2d = (Graphics2D) g;

    int length = samples[0].length;

    int width = getWidth() - 1;
    int height = getHeight() - 1;

    int oldX = 0;
    int oldY = height / 2;
    int frame = 0;

    // min, max is the min/max range of the samples, ie the highest and lowest samples
    int range = max + (min * -2);
    float scale = (float) height / (float) range;

    int minY = Math.round(((height / 2) + (min * scale)));
    int maxY = Math.round(((height / 2) + (max * scale)));

    LinearGradientPaint lgp = new LinearGradientPaint(
            new Point2D.Float(0, minY),
            new Point2D.Float(0, maxY),
            new float[]{0f, 0.5f, 1f},
            new Color[]{Color.BLUE, Color.RED, Color.BLUE});
    g2d.setPaint(lgp);
    for (int sample : samples[0]) {

        if (sample % 64 == 0) {

            int x = Math.round(((float) frame / (float) length) * width);
            int y = Math.round((height / 2) + (sample * scale));

            g2d.drawLine(oldX, oldY, x, y);

            oldX = x;
            oldY = y;

        }

        frame++;

    }

}

我使用AudioStream流来加载Wav文件并生成2D样本。

unftdfkk

unftdfkk2#

我猜您的wave绘制代码(从paintComponent(...)方法中调用)花费的时间比您想象的要长,并且占用了Swing绘制和EDT。
如果这是我的代码,我会考虑将我的waves绘制到BufferedImages * 一次 *,从这些图像中制作ImageIcons,然后在我的Swing Timer中简单地交换图标。

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