paint

问题 I have a JPanel inside a Jframe.I want to draw a line inside JPanel, using paint(Graphics g) method. But it is not working. Please Someone help me on this issue. Here is the code. Thank you all in advance. import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class JavaGraph { JPanel myPanel; public JPanel createPanel() { myPanel=new JPanel(); myPanel.setLayout(null); //myPanel.setBackground(Color.black

问题 I've been battling a bit (or a lot) with Java's Graphics, I've been going through the documentation and tutorials for drawing Java Graphics. Every example I've found seems to have a main class that extends a JPanel and then calls itself which executes the paint function somehow. Is it possible to draw graphics without using extends at all? I have a basic program import javax.swing.*; import awt.Graphics; public class basicWindow { public static void main(String[] args) { JFrame frame = new

问题 I am new to drawing and paints in c# & I am trying to make a simple program it has 3 intersecting circles (A,B,C). What i want to do is paint a certain (according to result I get). For example: If I get 1 as a result I want to fill the yellow bordered region, if I get 4 I want to fill green bordered region and so on. My Code to draw these circles: private void button1_Click(object sender, EventArgs e) { Graphics A = this.CreateGraphics(); Graphics B = this.CreateGraphics(); Graphics C = this

来源： https://stackoverflow.com/questions/63789906/how-to-create-custom-brushes-in-android

问题 When run this code: import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import javax.swing.JButton; import javax.swing.JLabel; public class CustomButton extends JButton { int width = 100; int height = 50; int radius = 10; JLabel lab; @Override protected void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D) g; g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setColor(Color.ORANGE); g2

问题 I did this code to get an image from firestore and use it as an icon for a Map Marker. final StorageReference storageReference = FirebaseStorage().ref().child("ProfilePictures/" + widget.userId); String avatarDownloadPath = await storageReference.getDownloadURL(); final File _avatar = await DefaultCacheManager().getSingleFile(avatarDownloadPath); Uint8List __avatar = await _avatar.readAsBytes(); BitmapDescriptor avatar = BitmapDescriptor.fromBytes(__avatar); setState(() { _markers.add(Marker

问题 I did this code to get an image from firestore and use it as an icon for a Map Marker. final StorageReference storageReference = FirebaseStorage().ref().child("ProfilePictures/" + widget.userId); String avatarDownloadPath = await storageReference.getDownloadURL(); final File _avatar = await DefaultCacheManager().getSingleFile(avatarDownloadPath); Uint8List __avatar = await _avatar.readAsBytes(); BitmapDescriptor avatar = BitmapDescriptor.fromBytes(__avatar); setState(() { _markers.add(Marker

问题 I want a window without title bar but with resizable frames and shadow. This can easily be achieved by removing WS_CAPTION and adding WS_THICKFRAME, however, since Windows 10, there's a 6px white non-client area. With the following code I create a window and paint all the client area with black, the window gets a left, right and bottom 6px transparent margins, however the top margin is white. #ifndef UNICODE #define UNICODE #endif #include <windows.h> LRESULT CALLBACK WindowProc(HWND hwnd,

问题 I want a window without title bar but with resizable frames and shadow. This can easily be achieved by removing WS_CAPTION and adding WS_THICKFRAME, however, since Windows 10, there's a 6px white non-client area. With the following code I create a window and paint all the client area with black, the window gets a left, right and bottom 6px transparent margins, however the top margin is white. #ifndef UNICODE #define UNICODE #endif #include <windows.h> LRESULT CALLBACK WindowProc(HWND hwnd,

问题 I'm trying to use the method described here to use a QPainter and GDI calls on the same widget. Unfortunately this tutorial seem to have been written on an earlier version of Qt and now it does not work. I set the WA_PaintOnScreen flag and reimplement paintEngine() to return NULL. Then on the paintEvent() I create a QPainter, use it and then use some GDI calls to paint a bitmap. The GDI calls work fine but the QPainter does nothing. I get the following error on the console: QPainter::begin: