传递x，y坐标画圆（）来的drawLine的（） [英] Passing x,y coordinates of drawCircle() to drawLine()
问题描述
我想两个圆圈之间画线。我画在画布上两个圆圈，这两个圈有自己的CX和CY点。 我想通过这些CX和CY两个圆来的drawLine（）的运行startx，starty和stopx，stopy。使得一个行应这两个圆之间绘制。这两个圈可以是彼此平行或水平彼此。什么到目前为止，我已计划是，我应该申请动作监听到圈子中，以获得他们的X和Y坐标。我在这里面临的问题是，画圆（）方法调用中的的onDraw（）和画线（）方法调用中的 onTouch（）。我已经在下面分享我的code请提出解决方案，使我能通圆的坐标的drawLine（）。
包com.example.circleline;进口android.app.Activity;
进口android.graphics.Bitmap;
进口android.graphics.Canvas;
进口android.graphics.Color;
进口android.graphics.Paint;
进口android.os.Bundle;
进口android.util.Log;
进口android.view.Display;
进口android.view.MotionEvent;
进口android.view.View;
进口android.view.View.OnTouchListener;
进口android.widget.ImageView;公共类MainActivity扩展活动实现OnTouchListener
{ ImageView的ImageView的;
位图位图;
帆布油画;
涂料粉刷;
涂料PDOT =新的油漆（）;
浮downx = 0，柔和= 0，UPX = 30，upy = 50;
INT COLS = 5;
INT行= 6;
@燮pressWarnings（德precation）
公共无效的onCreate（捆绑savedInstanceState）
{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）;
ImageView的=（ImageView的）this.findViewById（R.id.imageView1）; 显示currentDisplay = getWindowManager（）getDefaultDisplay（）。
浮DW = currentDisplay.getWidth（）;
浮DH = currentDisplay.getHeight（）;
位= Bitmap.createBitmap（（INT）DW，（INT）DH，Bitmap.Config.ARGB_8888）;
帆布=新的Canvas（位图）;
油漆=新的油漆（）;
paint.setColor（Color.BLUE）;
imageView.setImageBitmap（位图）;
DW = canvas.getWidth（）/（COLS + 1）;
DH = canvas.getDensity（）/（行+ 1）;
对于（INT Y = 0; Y＆LT;行; Y ++）
{
为（中间体X = 0; X＆下; COLS; X ++）
{
canvas.drawCircle（（X + 1）* DW，（Y + 1）*（3 * DH），20，PDOT）;
}
}
imageView.setOnTouchListener（本）;
//canvas.drawCircle(upx，upy，20，PDOT）;
}
公共布尔onTouch（视图V，MotionEvent五）{
INT行动= e.getAction（）;
开关（动作）
{
案例MotionEvent.ACTION_DOWN：
downx = e.getX（）;
柔和= e.getY（）;
Log.d（奥马尔，将String.valueOf（downx））;
Log.d（法鲁克，将String.valueOf（柔和））;
打破;
案例MotionEvent.ACTION_MOVE：
打破;
案例MotionEvent.ACTION_UP：
UPX = e.getX（）;
upy = e.getY（）;
canvas.drawLine（downx，柔和，UPX，upy，油漆）;
imageView.invalidate（）;
打破;
案例MotionEvent.ACTION_CANCEL：
打破;
默认：
打破;
}
返回true;
}}
把画线（）中的onDraw（）也是如此。放入的onDraw（）所有的绘图操作，他们不属于任何其他地方。在onTouch只需保存X / Y，和的onDraw（）在X / Y得出。
I am trying to draw line between two circles. I have drawn two circles on canvas, These two circles have their cx and cy points. I want to pass these cx and cy of both circles to drawLine()'s startx,starty and stopx,stopy. So that a line should be drawn between these two circles. These two circles can be parallel to each other or horizontal to each other. What I have planned so far is that I should apply action-listener to circles in order to get their x and y coordinates. The problem I am facing here is that drawCircle() method call is in onDraw() and lineDraw() method call is in onTouch(). I have shared my code below please suggest solution so that I can pass circle's coordinates to drawLine().
package com.example.circleline;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnTouchListener
{
ImageView imageView;
Bitmap bitmap;
Canvas canvas;
Paint paint;
Paint pDot = new Paint();
float downx=0,downy=0,upx=30,upy=50;
int cols = 5;
int rows = 6;
@SuppressWarnings("deprecation")
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView=(ImageView)this.findViewById(R.id.imageView1);
Display currentDisplay= getWindowManager().getDefaultDisplay();
float dw=currentDisplay.getWidth();
float dh=currentDisplay.getHeight();
bitmap=Bitmap.createBitmap((int) dw, (int)dh, Bitmap.Config.ARGB_8888);
canvas=new Canvas(bitmap);
paint=new Paint();
paint.setColor(Color.BLUE);
imageView.setImageBitmap(bitmap);
dw=canvas.getWidth()/(cols+1);
dh=canvas.getDensity()/(rows+1);
for (int y=0;y<rows;y++)
{
for (int x=0;x<cols;x++)
{
canvas.drawCircle((x + 1) * dw, (y + 1) *(3* dh), 20, pDot);
}
}
imageView.setOnTouchListener(this);
//canvas.drawCircle(upx, upy, 20, pDot);
}
public boolean onTouch(View v, MotionEvent e) {
int action=e.getAction();
switch(action)
{
case MotionEvent.ACTION_DOWN:
downx=e.getX();
downy=e.getY();
Log.d("Umar", String.valueOf(downx));
Log.d("Farooq", String.valueOf(downy));
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
upx=e.getX();
upy=e.getY();
canvas.drawLine(downx, downy, upx, upy, paint);
imageView.invalidate();
break;
case MotionEvent.ACTION_CANCEL:
break;
default:
break;
}
return true;
}
}
Put lineDraw() in onDraw() as well. Put all your drawing operations in onDraw(), they don't belong anywhere else. In onTouch just save the x/y, and in onDraw() draw at x/y.
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