小编Che*_*han的帖子

我想从我在单独的类 (Paintball) 中创建的方法 (paint) 绘制图形对象。我希望它仅在我用鼠标左键单击时才在图片框中绘制，并且我希望将我拍摄的点存储在列表中。当我尝试下面的代码时，它不会射击。下面是彩弹射击类。

{
    private List<Point> myClick;

    public Paintball()
    {                 
        myClick = new List<Point>();
    }

    public void add(Point location)
    {
        myClick.Add(location);                    
    }

    public void paint(Graphics g, Point point)
    {
        g.FillEllipse(Brushes.Blue, point.X, point.Y, 20, 20);
    }
}

}

这是下面的表格1。

namespace AmazingPaintball
{
    public partial class Form1 : Form
    {
        Random positionX = new Random();
        Random positionY = new Random();
        Target einstein;
        int count;
        List<Point> ballList = new List<Point>();
        Paintball gun; 

        public Form1()
        {
            InitializeComponent();
            Point point = new Point(positionX.Next(0, …

我刚刚安装android studio来制作我的第一个应用程序,但是当我创建一个测试项目时,GUI没有出现并说

渲染问题此版本的渲染库比您的Android Studio版本更新.请更新Android Studio(详细信息)

详情如下.

org.jetbrains.android.uipreview.RenderingException: This version of the rendering library is more recent than your version of Android Studio. Please update Android Studio
    at org.jetbrains.android.uipreview.LayoutLibraryLoader.load(LayoutLibraryLoader.java:90)
    at org.jetbrains.android.sdk.AndroidTargetData.getLayoutLibrary(AndroidTargetData.java:159)
    at com.android.tools.idea.rendering.RenderService.createTask(RenderService.java:164)
    at com.intellij.android.designer.designSurface.AndroidDesignerEditorPanel$6.run(AndroidDesignerEditorPanel.java:475)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
    at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
    at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
    at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
    at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

请让我知道如何解决问题.

错误消息是:

Error   1   A field initializer cannot reference the non-static field, method, or property 'AmazingPaintball.Form1.thePoint'    

这是构造函数:

namespace AmazingPaintball
{
class Paintball
{
    public Point startPoint;


    public Paintball(Point myPoint)
    {
        startPoint = myPoint;


    }

这是导致错误的代码:

    Point thePoint = new Point(50, 50);
    Paintball gun = new Paintball(thePoint);