如何使用Android图形类绘制箭头？ [英] How to draw an arrow using android graphic class?

问题描述

我如何使用图形类绘制箭头？

How can i draw an arrow using the graphics class?

我使用android图形类，基本上是在尝试在地图上显示路径。所以我需要在画布上打印一个箭头。

Im using android graphics class and basically im trying to show a path on a map. So i need to print an arrow head on the canvas. Help me to figure out!

谢谢！

这是我用来画画的方法之一。一条线。我想在每行的边缘上打印一个箭头。

This is one of the methods i have used to draw a line. i want to print an arrow head on the edge of each and every line.

//       ArrayList<Point> ArrayListPoints = new ArrayList<Point>(); // Assign the shortest path here

//       ArrayListPoints.add(new Point(262,100));
//       ArrayListPoints.add(new Point(262,165));
//       ArrayListPoints.add(new Point(346,165));
//       ArrayListPoints.add(new Point(420,165));

       ArrayList<Point> ArrayListPointsFINAL;

    ArrayListPointsFINAL = storePath.ArrayListPoints;

    if(ArrayListPointsFINAL == null){
        System.out.println("ArrayListPointsFINAL is NULL");
    }
    else{

    ArrayList<Float> ArrayList_X = new ArrayList<Float>();
     ArrayList<Float> ArrayList_Y = new ArrayList<Float>();
     //int size = get.ArrayListPoints.size();

    for(int i=0; i<ArrayListPointsFINAL.size(); i++){
        ArrayList_X.add(Float.parseFloat(String.valueOf(ArrayListPointsFINAL.get(i).x)));
        ArrayList_Y.add(Float.parseFloat(String.valueOf(ArrayListPointsFINAL.get(i).y)));
          }   

    for(int i=1; i<ArrayList_X.size(); i++){
        Paint myPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        myPaint.setStrokeWidth(8/*1 /getResources().getDisplayMetrics().density*/);
        myPaint.setColor(0xffff0000);   //color.RED
       // myPaint.setStyle(myPaint);

       canvas.drawLine(ArrayList_X.get(i), ArrayList_Y.get(i), ArrayList_X.get(i-1), ArrayList_Y.get(i-1),myPaint);       

    }

推荐答案

您可以而是绘制一个位图并对其应用矩阵。

You can draw a Bitmap instead and apply a matrix to it.

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