draw

问题 Given image.RGBA , coordinates, and a line of text, how do I add a simple label with any plain fixed font? E.g. Face7x13 from font/basicfont. package main import ( "image" "image/color" "image/png" "os" ) func main() { img := image.NewRGBA(image.Rect(0, 0, 320, 240)) x, y := 100, 100 addLabel(img, x, y, "Test123") png.Encode(os.Stdout, img) } func addLabel(img *image.RGBA, x, y int, label string) { col := color.Black // now what? } Alignment doesn't really matter, but best if I could write

问题 I have a list view and draw it with OwnerDraw . How to draw a simple and smooth progress bar with rounded angles and a line on the top as on a picture below? I need your help to apply a code below to my needs (my skills don't make it possible to edit). // TUbuntuProgress // Version 1.2 unit UbuntuProgress; interface uses Windows, SysUtils, Classes, Controls, Graphics, Math, ExtCtrls; type TUbuntuProgressColorSets = (csOriginal, csBlue, csRed); TUbuntuProgressMode = (pmNormal, pmMarquee);

问题 Can we paint images and draw text... outside a form.. i mean literally outside... i know its stupid question to ask but CAN we... 回答1: You can "cheat" by creating a form, and setting its TransparentColor property to its background color, then draw on it. However, this prohibits you from drawing the transparent color because it won't show. Or you could actually draw directly to the desktop. [DllImport("User32.dll")] public static extern IntPtr GetDC(IntPtr hwnd); [DllImport("User32.dll")]

问题 I want to open jpeg image file, encode it, change some pixel colors, and then save it back as it was. I'd like to do something like this imgfile, err := os.Open("unchanged.jpeg") defer imgfile.Close() if err != nil { fmt.Println(err.Error()) } img,err := jpeg.Decode(imgfile) if err != nil { fmt.Println(err.Error()) } img.Set(0, 0, color.RGBA{85, 165, 34, 1}) img.Set(1,0,....) outFile, _ := os.Create("changed.jpeg") defer outFile.Close() jpeg.Encode(outFile, img, nil) I just can't come up with

问题 I want to draw a mailing label with some rectangles, barcodes, and then finally generate a PNG/PDF file. Is there is a better way to draw a shape in Go other than to do it with primitives - pixel by pixel? 回答1: The standard Go library does not provide primitive drawing or painting capabilities. What it provides is models for colors (image/color package) and an Image interface with several implementations (image package). The blog post The Go Image package is a good introduction to this. It

问题 I have a JScrollPane and on top of it I have a JPanel named 'panel1'. I want some rectangles to be drawn on this JPanel. I have a class named DrawRectPanel which extends JPanel and does all the drawing stuff. The problem is that, I tried to draw the rectangles on panel1 by writing the following code : panel1.add(new DrawRectPanel()); but nothing appeared on panel1 then I tried, just as a test to the class DrawRectPanel : JFrame frame = new JFrame(); frame.setSize(1000, 500); Container

问题 I am new to WP7 development and I would like to know how can I write text to image? First is it possible to do so? As in GDI we can write text to image as shown below: Dim pth As New GraphicsPath() pth.AddString(txtSample.Text, New FontFamily(DropFont.SelectedValue), 0, Integer.Parse(DropFontSize.SelectedValue), New Point(left, top), StringFormat.GenericTypographic) But in WP7 as I came to know that GDI is not supported.So how Can I do this? Edit: I need to select an image from the pictures

问题 I want to draw/paint on a webcam screen using OpenCV. Since I'm reading from a cam, the frames are constantly changing, so I'm trying to figure out a way to keep or save the drawing on the current frame and use it for the next frame. The code below allows you to draw on the screen but when it gets the next frame, the drawing is gone and it starts over. Could someone please help me ... Thanks. CvCapture *input; input = cvCaptureFromCAM( 0 ); cvSetMouseCallback("Demo",&on_mouse, 0); for(;;) {

问题 I want to draw the lines between 2 JScrollPanes (first scroll pane on the left side, second on the right). These JScrollPanes contain images. I want to draw lines between these 2 images (use some layers, use some trick etc.). I tried do it different ways, but i failed. Is it possible? (if not, i will have to make 2 images in one JScrollPane and it won't be nice). EDIT I want to draw between 2 images - throught components - get some points from images and draw lines between them. I apologize

问题 my application looks like that, i am getting a null pointer exception at the draw() method, to be exact at g.drawImage(img, 0, 0, null) package com.ochs.game; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class Game extends JPanel implements Runnable{ private static final long serialVersionUID = 8229934361462702491L; public static final int WIDTH = 320; public