心图形为Android

问题描述

我想打一个应用程序实时显示心脏图。这意味着我要测量心脏位和要显示的比特率曲线在我的应用程序。但我想知道画出心图。我已经经历了很多示例图表codeS走了，但力得到任何线索，绘制心图。是否有任何身体的任何线索？

I want to make an app which shows cardio graph in real time. That means i want to measure heart bit and want to show the bit rate in graph in my application. But i wondering to draw the cardio graph. I have gone through many sample graph codes but dint get any clue to draw cardio graph. Is there any clue from any body?

感谢和放大器;问候

推荐答案

对于这个特定的应用程序，您可能希望使用路径和SurfaceView绘制图形手动。

For this specific application, you may want to draw the graph "by hand" using Path and a SurfaceView.

在初始化过程中得到一个油漆实例，准备：

Get a Paint instance ready during initialization:

Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(3);
paint.setColor(Color.GREEN);  //Change to what you want

当您需要更新的图形，清场，并建行路径（此相适应您的需求）：

When you need to update the graphic, clear the scene and build the line path (adapt this to your needs) :

canvas.drawColor(Color.WHITE);

Path path = new Path();
path.moveTo(0, yourValueAt(0));
for(int sec = 1; sec < 30; sec++)
    path.lineTo(sec, yourValueAt(sec));

canvas.drawPath(path, paint);

您也可以使用quadTo或cubicTo代替了lineTo。

You may also use quadTo or cubicTo instead of lineTo.

如果你希望你的图有一个实时动画效果（即向左滑动，而数据即将在右侧），您可以利用类似的方式，以著名的LunarLander例如SurfaceView（以下code是一个简化版本）：

If you want your graph to have a realtime animation effect (i.e. sliding to the left while data is coming on the right), you may draw on a SurfaceView in a similar way to the famous LunarLander example (following code is a simplified version):

class DrawingThread extends Thread {
    @Override
    public void run() {
        while (running) {
            Canvas c = null;
            try {
                c = mSurfaceHolder.lockCanvas(null);
                synchronized (mSurfaceHolder) {
                    doDraw(c);
                }
            } finally {
                if (c != null) mSurfaceHolder.unlockCanvasAndPost(c);
            }
            synchronized (this) {
                //Optional but saves battery life.
                //You may compute the value to match a given max framerate..
                this.wait(SOME_DELAY_IN_MS);
            }
        }
    }
}

在哪里mSurfaceHolder是通过调用获得 yourSurfaceView.getHolder（）和 doDraw 是你叫 canvas.drawPath（）和所有的绘图code。

Where mSurfaceHolder is obtained by calling yourSurfaceView.getHolder() and doDraw is whereyou call canvas.drawPath() and all your drawing code.

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