Stack Overflow
Stack Overflow

Questions tagged [custom-painting]

147 questions
0
votes
1 answer

Redraw CustomPaint without updating state / rebuilding widget?

I'm trying to understand how customPaint works, I want to draw a custom frame by frame animation on a canvas. I can make it work by redrawing the widget every 1/60 seconds, but that doesn't sound very efficient. I would like render the CustomPainter…
jptsetung
  • 9,064
  • 3
  • 43
  • 55
0
votes
1 answer

Flutter displaying cropped widgets

I would like to paint widgets outside the canvas and display only cropped portion ie., the screen's size or my own size and I want to do this dynamically. Eg:sample img I was able to do this by using UnconstrainedBox( child: Align( …
veradeus
  • 41
  • 4
0
votes
1 answer

How can I have equality check on a Function in a dart (to use in CustomPainter's shouldRepaint method)?

I have a problem with dart equality checks on a Function. I have a CustomPainter and I want to implement it's shouldRepaint() method efficiently. There is a Function field (ColorResolver) in the painter that gives a y value and gets a color for…
imaN NeoFighT
  • 480
  • 4
  • 13
0
votes
1 answer

canvas drawLine offset property in flutter

OK so straight to the point in flutter in order to draw a line we have to define offset points and as a dummy i cant understand how they work. I know that the offset displaces the drawn line but how am I suppose to know what values should I pass.…
Mansour Farokhinezhad
  • 23
  • 1
  • 7
0
votes
0 answers

Flutter: onTap is not triggering on Gesture detector which is in top of a Custom Paint Widget

Here is my Widget child: Scaffold( body: GestureDetector( behavior: HitTestBehavior.deferToChild, onPanUpdate: (DragUpdateDetails details) { setState(() { RenderBox box =…
Utsab Malakar
  • 1
  • 1
0
votes
0 answers

List of all rendered words' boxes in Flutter

How can I have list of boxes containing all words I render, I need it to determine which word is user long clicking? In other words how can I find what maxRange so I can use getBoxesForRange in code below? My code : var pin = Offset(0, 0); //…
AVEbrahimi
  • 17,993
  • 23
  • 107
  • 210
0
votes
0 answers

Height of CustomPaint in flutter

I am buildig a CustomPaint widget to display text in a custom way, using ParagraphBuilder, named it myHtmlWidget. My problem is how to determine height of widget before painting it? I tried to call ParagraphBuilder in constructor of MyHtmlPainter…
AVEbrahimi
  • 17,993
  • 23
  • 107
  • 210
0
votes
1 answer

Custom painting and Z-order: query re painting order

So, I want to Z-order some components in a JFrame. The component(s): public class aBLUEBox extends JPanel{ int xPos = 19; int yPos = 20; int width = 10; int height = 80; public void paintBox(Graphics g){ …
ZanyGoose
  • 3
  • 2
0
votes
0 answers

Why can't I remove a dashed circle (arc) by drawing it twice with ctx.globalCompositeOperation = "xor";?

I want to make a dashed circle on a canvas in pure JavaScript, that moves to follow the mouse pointer. The circle has no (solid) fill. I thought that by just painting over it again with ctx.globalCompositeOperation = "xor"; would remove it, but that…
user2943111
  • 421
  • 1
  • 5
  • 15
0
votes
1 answer

How can I change the image size with giving one single int value instead changing all the time all the values?

private Image GetIcon(bool nodeIsExpanded) { if (openedImage == null) InitImage(); return nodeIsExpanded ? openedImage : closedImage; } In the InitImage I'm setting the size in this case triangle : private void…
Daniel Lip
  • 3,867
  • 7
  • 58
  • 120
0
votes
1 answer

Use multiple threads to update GUI

I'm learning to work with java threads, so I decided to make a simple bouncing balls program. However, the program shows multiple threads but only one takes advantage of the window size, other balls are restricted to one area. I tried setting the…
NullForest
  • 3
  • 1
  • 2
0
votes
1 answer

Trying to divide color's to draw rainbow donut

Board class: import java.awt.*; import java.awt.geom.AffineTransform; import java.awt.geom.Ellipse2D; import javax.swing.JPanel; public class Board extends JPanel { @Override public void paintComponent(Graphics g) { super.paintComponent(g); …
Tomasz Gula
  • 1
0
votes
1 answer

How to draw a bar in this example?

In this exercise, when you enter the name of a city and its population, in the window it must be graphed a bar that represents the population of that city as shown in the figures, the exercise is almost complete but it doesn't work, could someone…
Luis Alejandro
  • 57
  • 5
0
votes
0 answers

How do you draw one shape under another in Java?

I know how to draw shapes and stuff in Java and know that more recently-drawn shapes stack up on previously drawn shapes, but how do you draw one shape under another? Like let's say you filled a Rectangle() r1, but then filled another Rectangle() r2…
MineEnim
  • 1
  • 1
0
votes
1 answer

How do I draw on a JPanel from multiple outside classes?

I am currently making a game with a main menu and a world where you actually play. I have a class called Game, which inherits from JPanel and implements the Runnable, MouseListener, KeyListener and ActionListener interfaces (only important parts…
Keheck
  • 131
  • 1
  • 10
1 2 3
…
9 10