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How to draw part of space between two circles in Android


How to draw part of space between two circles in Android

By : Rob Heselwood
Date : November 14 2020, 04:51 PM
hope this fix your issue here is simple example using canvas and bitmaps, try this example and get some idea for your requirement. image cropping and transparent
code :


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android how to draw circles ,rectangles on canvas?

android how to draw circles ,rectangles on canvas?


By : MZA
Date : March 29 2020, 07:55 AM
it fixes the issue In my app i am able to draw something on canvas within on touch event.
code :
//THESE ARE GLOBAL!
boolean isDrawing = false;
boolean circle = true; //default
boolean rect = false;
boolean line = false;
Button circleB,rectB,lineB;
boolean circle = true; //set circle to true
boolean rect = false;
boolean line = false;
boolean circle = false;
boolean rect = true; //set rect to true
boolean line = false;
boolean circle = false; 
boolean rect = false;
boolean line = true; //set line to true
//Global
int size = 10; //Default:
boolean isScaling=false;
public boolean onTouch(View arg0, MotionEvent e) {
switch(e.getAction()){
    case(MotionEvent.ACTION_DOWN):
        isScaling=true;
    break;
    case(MotionEvent.ACTION_MOVE):
        if(isScaling){
            size++; //increment as you want
        }
    break;
    case(MotionEvent.ACTION_UP):
        isScaling=false;
        if(!isDrawing){
            isDrawing=true;
            if(circle)
            {
                //code to Draw Circle
            }
            else if(rect)
            {
                //code to Draw Rect
            }
            else if(line)
            {
                //code to Draw line
            }
            isDrawing=false;
        }
        //reset size I think it is better to reset it
    break;
    }
}
Draw Multiple Circles horizontally android

Draw Multiple Circles horizontally android


By : Timedrop
Date : March 29 2020, 07:55 AM
wish helps you You can choose two option, either have multiple view, each having a single circle or draw multiple circle in a single view. I'd prefer the first option, but since your need may vary, so I am explaining both the option.
Option 1:
How to draw a line of circles in android

How to draw a line of circles in android


By : pvs
Date : March 29 2020, 07:55 AM
it helps some times I use a TextView to which five strings (I have 5 steps) all composed with Unicode characters (\u26cb for the empty circle) and (\u26cf for the filled circle).
Like this (i stored them in my res/values/arrays.xml file):
code :
<!-- Steps -->
<string-array name="steps">
    <item>\u25cf \u25cb \u25cb \u25cb \u25cb</item>
    <item>\u25cb \u25cf \u25cb \u25cb \u25cb</item>
    <item>\u25cb \u25cb \u25cf \u25cb \u25cb</item>
    <item>\u25cb \u25cb \u25cb \u25cf \u25cb</item>
    <item>\u25cb \u25cb \u25cb \u25cb \u25cf</item>
</string-array>
Best way to draw a large number of circles on Android?

Best way to draw a large number of circles on Android?


By : Onams
Date : March 29 2020, 07:55 AM
This might help you I would suggest that you
draw one circle to a separate canvas; convert this to an alpha-blended bitmap; draw all your circles by rendering this bitmap.
Trying to draw multiple circles but both circles connect with a line

Trying to draw multiple circles but both circles connect with a line


By : user3527831
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I drew a circle but when I try to add another circle a line connects both circles. , From the CGContextAddArc() documentation:
code :
CGContextMoveToPoint(context, center.x + CGFloat(cos(startAngle)) * radius, center.y + CGFloat(sin(startAngle)) * radius)
CGContextAddArc(context, center.x, center.y, CGFloat(radius), CGFloat(startAngle), CGFloat(endAngle), 0)

CGContextMoveToPoint(context, inside.x + CGFloat(cos(startAngle)) * radius, inside.y + CGFloat(sin(startAngle)) * radius)
CGContextAddArc(context, inside.x, inside.y, CGFloat(radius), CGFloat(startAngle), CGFloat(endAngletwo),0)
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