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 also provides a capability to combine images (e.g. draw them on … Read more
Use the bold/italic version of the font
You can do this: Paint paint = new Paint(); final RectF rect = new RectF(); //Example values rect.set(mWidth/2- mRadius, mHeight/2 – mRadius, mWidth/2 + mRadius, mHeight/2 + mRadius); paint.setColor(Color.GREEN); paint.setStrokeWidth(20); paint.setAntiAlias(true); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStyle(Paint.Style.STROKE); canvas.drawArc(rect, -90, 360, false, paint); The key is in paint.setStyle(Paint.Style.STROKE);, it crops the arc’s center with the stroke that you define in … Read more
I had the same challenge and came to the conclusion that overwriting onDraw will at least in the general case not work. My blog explains the reasons. What worked very well for me is the following: Create a new image bitmap and attach a brand new canvas to it. Draw the image bitmap into the … Read more
Yeah, you can do this. Keep in mind, since you’re not attaching it to a layout, you’ll need to lay it out manually before drawing it: view.layout(0, 0, viewWidth, viewHeight); And unless you just know exactly what you want for those width and height parameters, you may also want to measure it first: int widthSpec … Read more
please don’t try with the old cv module, use cv2: import cv2 cv2.rectangle(img, (x1, y1), (x2, y2), (255,0,0), 2) x1,y1 —— | | | | | | ——–x2,y2 [edit] to append the follow-up questions below: cv2.imwrite(“my.png”,img) cv2.imshow(“lalala”, img) k = cv2.waitKey(0) # 0==wait forever
I used the answer on this question. The code I used looks something like this: /** * Draw a String centered in the middle of a Rectangle. * * @param g The Graphics instance. * @param text The String to draw. * @param rect The Rectangle to center the text in. */ public void drawCenteredString(Graphics … Read more
To draw multiple strings, call graphics.DrawString multiple times. You can specify the location of the drawn string. This example we will draw two strings “Hello”, “Word” (“Hello” in blue color upfront “Word” in red color): string firstText = “Hello”; string secondText = “World”; PointF firstLocation = new PointF(10f, 10f); PointF secondLocation = new PointF(10f, 50f); … Read more
Note the extra comments. import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; class JavaPaintUI extends JFrame { private int tool = 1; int currentX, currentY, oldX, oldY; public JavaPaintUI() { initComponents(); } private void initComponents() { // we want a custom Panel2, not a generic JPanel! jPanel2 = new Panel2(); jPanel2.setBackground(new java.awt.Color(255, 255, 255)); jPanel2.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED)); … Read more
You should use “beginPath()“. That is it. function lineDraw() { var canvas=document.getElementById(“myCanvas”); var context=canvas.getContext(“2d”); context.clearRect(0, 0, context.width,context.height); context.beginPath();//ADD THIS LINE!<<<<<<<<<<<<< context.moveTo(0,0); context.lineTo(event.clientX,event.clientY); context.stroke(); }