logo
down
shadow

Drawing Oval on canvas with PAINT object in Android


Drawing Oval on canvas with PAINT object in Android

By : Tester Wmpn
Date : November 21 2020, 01:01 AM
Hope this helps Finally I got an answer to this question, A great help by this article Transparency with JPEGs done right that describes how PorterDuff modes are work, In that article I found this Xfermodes Example which gives me where is the error and here is the description.
Actually, I don't need to create a paint object everytime, what I need is to deal with the xfermodes in a correct way, the perfect code is:
code :
 Bitmap currBitmap = null;
 Canvas currCanvas = null;

 //Config Paint Case2
 final Paint currPaint = new Paint();
 List BlocksList = null;
 boolean bSet = false;

public void DrawOval(Bitmap src, int nRadiusprct) 
{
    // image size
    int width = src.getWidth();
    int height = src.getHeight();

    //create bitmap output
    if(currBitmap  == null)
        currBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

    // set canvas for painting
    if(currCanvas == null)
    {
        currCanvas = new Canvas(currBitmap);
        MainActivity.imgMain.setImageBitmap(currBitmap);
    }

    // config paint Case2
    if(!bSet)
    {
        currPaint.setAntiAlias(true);
        currPaint.setColor(Color.BLACK);
        bSet = true;
    }

    // config rectangle for embedding
    int nMidWidth = width/2;
    int nMidHeight = height/2;
    float fPercent = (nRadiusprct / 100.0f);

    float fLeft = nMidWidth * (1 - fPercent);  
    float fRight = nMidWidth * (1 + fPercent);
    float fTop = nMidHeight * (1 - fPercent);
    float fBottom = nMidHeight * (1 + fPercent);

    final Rect rect = new Rect(0, 0, width, height);
    final RectF rectF = new RectF(fLeft, fTop, fRight, fBottom);

    Xfermode BeforEPaintXferMode = currPaint.getXfermode();

    currCanvas.drawOval(rectF, currPaint);

    // create Xfer mode
    currPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));

    // draw source image to canvas
    currCanvas.drawBitmap(src, rect, rect, currPaint);

    currPaint.setXfermode(BeforEPaintXferMode);

    MainActivity.imgMain.invalidate();
}


Share : facebook icon twitter icon
Drawing on canvas with paint in better resolution? (Android)

Drawing on canvas with paint in better resolution? (Android)


By : David Chiles
Date : March 29 2020, 07:55 AM
hop of those help? I made a little loading circle with Canvas and Paint. This is my first attempt to use these classes so it could be something I used wrong. , Declare paint like this:
code :
final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setAntiAlias(true);
Drawing oval in canvas using swing

Drawing oval in canvas using swing


By : Saddam Hussain of Na
Date : March 29 2020, 07:55 AM
like below fixes the issue JPanel uses FlowLayout which respects preferred sizes but the default size of the Dot component is too small to be seen. You need to use a layout manager that uses the maximum area available or override getPreferredSize. Remember to call pack before calling JFrame#setVisible
code :
jpanel.setLayout(new BorderLayout());
Drawing an Oval in Android works, but drawing a rectangle doesn't

Drawing an Oval in Android works, but drawing a rectangle doesn't


By : adnan shahid adnan s
Date : March 29 2020, 07:55 AM
should help you out I think you need to handle the points so that they conform to RectF.
From http://developer.android.com/reference/android/graphics/RectF.html
code :
Note: most methods do not check to see that the coordinates are sorted correctly (i.e. left <= right and top <= bottom).
Drawing multiple oval shapes on HTML canvas using JavaScript having an extra line

Drawing multiple oval shapes on HTML canvas using JavaScript having an extra line


By : Ivo Mendes
Date : March 29 2020, 07:55 AM
Does that help You are missing the context.beginPath. Please see this JSFIddle: https://jsfiddle.net/zwcd7hcw/
code :
function drawOvalShape(context, center_x, center_y, width, height){
        context.beginPath()
        context.ellipse(center_x, center_y, width, height,  90 * Math.PI/180, 0, 2 * Math.PI);
        context.stroke();
}
 var canvas = document.getElementById("myCanvas");
    var context = canvas.getContext("2d");
    var center_x = 200;
    var center_y = 100;
    var width = 100;
    var height = 200;
    drawOvalShape(context, 200, 100, 100, 200);
    drawOvalShape(context, 200, 100, 80, 180);
    drawOvalShape(context, 200, 100, 60, 160);
    drawOvalShape(context, 200, 100, 40, 140);
    drawOvalShape(context, 200, 100, 20, 120);

    function drawOvalShape(context, center_x, center_y, width, height){
			context.beginPath()
        context.ellipse(center_x, center_y, width, height,  90 * Math.PI/180, 0, 2 * Math.PI);

       context.stroke();
    }
<canvas id="myCanvas" width="400" height="200" style="border:1px solid #000000;">
</canvas>
Android paint/canvas issue; drawing smooth curves

Android paint/canvas issue; drawing smooth curves


By : SimonKhan
Date : March 29 2020, 07:55 AM
I wish this helpful for you There is a FingerPaint application bundled with API demos package; you can take a look at that. Here is the link
Related Posts Related Posts :
  • Android Studio gradle build failed for hello world app
  • Slide a layout up from bottom of screen
  • Play HTML5 video in iOS/Android native media player
  • How to rescale a bitmap file in android?
  • No view found for id 0x for fragment after rotation?
  • Define different themable styles to the same widget types
  • ProGuard not working in my app
  • FragmentTransaction from BaseAdapter
  • Connecting multiple devices in a Wifi Direct group
  • Why TabActivity is deprecated in android
  • How to capture low resolution picture using android camera
  • android preferenceactivity padding in landscape orientation
  • How can I store cookie in webview?
  • Passing variables from one activity to another
  • Create Multicolored Pie Chart in Android Studio
  • how to kill progress dialog in android
  • Show Error on the tip of the Edit Text Android
  • How do I use getWindowManager() by another java file
  • fetching images from gallery on android phones with internal storage
  • How to discover devices like Google TV and Nexus-Q using MediaRoute API on Android?
  • "Unfortunately your app stopped working"- Facebook Integration for Android
  • How to animate button in android?
  • Resource Not Found Exception in class without context or activity
  • Launching Android Netflix App And Passing Video Id
  • Making a Phone Call with a Number Extension
  • NullPointerException at BoringLayout.isBoring is anything but boring
  • java.lang.RuntimeException: Unable to get provider
  • Testing custom Views with Robolectric
  • tools:listheader doesn't work although tools:listitem does
  • oppo, vivo app kill notification not coming in android fcm
  • OnClick Method could not function correctly with if else statement
  • Best method to download image from url in Android
  • How can I open Drawer Layout moving all the view and not just slide over?
  • how to show profile pictures of friends in a list view?
  • Creating TimePickerDialog with custom style in Android
  • Android 2.3.6 support library v7 option menu is missing
  • need of vblank in Display subssytem
  • Android MP4 stream - Video cannot be played
  • FastAdapter: Undo button does not show up after swipe
  • What are reasons to pass getActivity as the LifecycleOwner to the LiveData's observe method in a fragment?
  • Implement Face Recognition in Android
  • Titanium studio cannot run "titanium" command in terminal
  • How to execute command line ffmpeg commands programatically in android?
  • Make Android List Items clickable with each item pointing to a different link
  • listview runs successfully, but nothing is display in emulator
  • How to zoom in a bitmap with high resolution?
  • Passing listView data through intent
  • Google map route direction show by arrows in android v2
  • how to start "uiautomator test run" from android code?
  • Proguard in Android Library
  • Alarm Clock from GIT - Gives error - Android
  • Mock injection using Mockito - Android
  • Get Bitmap from universal image loader
  • Unable to include custom font in android
  • Basics on using logcat in Android development
  • Android: Clear cache programmatically
  • Android: pass object without serialization
  • Can not scroll and click item on gridview inside scrollview
  • Android device keeps disconnecting from adb / eclipse
  • Volley cannot create cache directory. Could not clean up file
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org