drawing

问题 I am restarting some code for a covid simulation as I cant use the collide function in my current one. I have been able to draw the basic background, and draw one cell. However, when i try create the cell in a different place on my screen it does not appear for some reason. My code is as seen below: import random import pygame # import numpy import time pygame.init() GREEN1 = (0, 255, 0) # Healthy cells RED = (255, 0, 0) # Infected cells GREEN2 = (0, 100, 0) # Healthy cells not susecptible

问题 I'm trying to trim a Bitmap based on white pixels. I'd like to do it efficiently, so I'm avoiding using .GetPixel I'm implementing the marked-correct answer from this question. In the answer, they detect whether pixels in a byte array are transparent. I would like to detect whether the pixels are white instead, with a threshold (so if it is less white than a threshold then foundPixel=true; . I've extracted the relevant code here: static Bitmap TrimBitmap(Bitmap source) { BitmapData data =

问题 I'm computing the area of a rectagle after exclude the area of some circles. this is my current solution: var region = new Region( new Rectangle(0, 0, 10, 10) ); var circle = new System.Drawing.Drawing2D.GraphicsPath(); circle.AddEllipse(50, 50, 25, 25); // Exclude the circle from the region. region.Exclude(circle); However I need something like region.getArea() to get the area after excluding the circle. Do you know how to compute a System.Drawing.Region area? -Or- Do you know another way to

问题 Let say I got the sprite to the left and I want to apply a red filter over the image before drawing it in a canvas so it looks like the sprite to the right. http://puu.sh/6dQ0E.png Is there a way to do that? It could be done in two steps, but I don't know if it's possible to draw the geometric figure that has the exact same shape than the image. (Ex: Drawing a rectangle over it won't match.) Note: I want the filter to only be applied to this image, not the whole canvas. 回答1: You can combine 2

问题 I'm trying to draw a 3d image that displays a ripple: function myFunc(x, y) { let zRipple = Math.pow(2, -0.005 * (Math.abs(x) + Math.abs(y))) * Math.cos(((x * x + y * y) * 2 * pi) / 180 / width) * height; return zRipple; } width and height here are constants that define a drawing area and are equal to 200 in my tests. My approach is based on what I recall from an article that I read 30 years ago and trying to recall now. The idea is to: split the whole drawing board into the 10-pixel grid for

问题 I'm trying to draw a 3d image that displays a ripple: function myFunc(x, y) { let zRipple = Math.pow(2, -0.005 * (Math.abs(x) + Math.abs(y))) * Math.cos(((x * x + y * y) * 2 * pi) / 180 / width) * height; return zRipple; } width and height here are constants that define a drawing area and are equal to 200 in my tests. My approach is based on what I recall from an article that I read 30 years ago and trying to recall now. The idea is to: split the whole drawing board into the 10-pixel grid for

问题 I have path rect and bitmap, want to add bitmap inside path, While draw on start it appears as expected, but while rotate and draw bitmap goes outside bounds. Here is my code. canvas!!.rotate(rotateAngle.toFloat(), rectF2.centerX(), rectF2.centerY()) canvas!!.drawPath(path, mPaint) bitmap?.let { canvas!!.drawBitmap(it, rectF2.left, rectF2.top, mPaint) } canvas!!.restore() RotateAngle is 0 RotateAngle is 50 回答1: Here is the working solution with matrix. bitmap?.let { val rotate = Matrix()

问题 I have path rect and bitmap, want to add bitmap inside path, While draw on start it appears as expected, but while rotate and draw bitmap goes outside bounds. Here is my code. canvas!!.rotate(rotateAngle.toFloat(), rectF2.centerX(), rectF2.centerY()) canvas!!.drawPath(path, mPaint) bitmap?.let { canvas!!.drawBitmap(it, rectF2.left, rectF2.top, mPaint) } canvas!!.restore() RotateAngle is 0 RotateAngle is 50 回答1: Here is the working solution with matrix. bitmap?.let { val rotate = Matrix()

问题 I have path rect and bitmap, want to add bitmap inside path, While draw on start it appears as expected, but while rotate and draw bitmap goes outside bounds. Here is my code. canvas!!.rotate(rotateAngle.toFloat(), rectF2.centerX(), rectF2.centerY()) canvas!!.drawPath(path, mPaint) bitmap?.let { canvas!!.drawBitmap(it, rectF2.left, rectF2.top, mPaint) } canvas!!.restore() RotateAngle is 0 RotateAngle is 50 回答1: Here is the working solution with matrix. bitmap?.let { val rotate = Matrix()

问题 This question already has answers here : how to handle time for different components in pygame (1 answer) How to run multiple while loops at a time in Python [duplicate] (1 answer) Pygame clock and event loops (1 answer) Closed 17 days ago . I have snake that is turning and drawing trajectory behind him but I don't know how to make holes like random pauses while he's drawing. I tried it and it's not random but problem is that it's very fast pause. It's like teleporting move. Here is my code: