ellipse

问题 class Particle{ PVector velocity, location; //PVector variables for each particle. Particle(){ //Constructor - random location and speed for each particle. velocity = new PVector(random(-0.5,0.5), random(-0.5,0.5)); location = new PVector(random(0,width),random(0,width)); } void update() { location.add(velocity); } //Motion method. void edge() { //Wraparound case for particles. if (location.x > width) {location.x = 0;} else if (location.x < 0) {location.x = width;} if (location.y > height)

问题 I am trying to test if a point lies within a circle and if the point is on the perimeter, it should be included in the results. However, Java's contains() implementation uses less than instead of less than or equal to. For example consider this snippet: Ellipse2D.Double circle = new Ellipse2D.Double(0, 0, 100, 100); System.out.println(circle.contains(50, 0)); System.out.println(circle.contains(50, 100)); System.out.println(circle.contains(0, 50)); System.out.println(circle.contains(100, 50));

问题 I want to plot a point in elliptical curve in J2ME I have values for X,Y,width,height and t. X and Y are the position of the ellipse(according to J2ME) with respect to Canvas and t is angle with respect to the center of ellipse(I have an image representation of the problem , but unfortunate blog is not allowing to insert into discussion :) ) int ePX = (X + width)+ (int) (width * Math.cos(Math.toRadians(t))); int ePY = (Y + height)+ (int) (height * -Math.sin(Math.toRadians(t))); Is this

问题 Whoa SDK, whoa... So I'm attempting to add an ellipse to the end of my TextView (single line) before it runs off screen. I've read that ellipses are broke (developing for 2.1)? After Google searching, everyone seems to suggest setting inputType to text and maxLines to 1 and you will get an ellipse. There are two problems with this: 1) The text runs off the screen, but doesn't ellipse. I can tell the text is running off the screen because only a half of a character is showing at the edge of

问题 In the table layout i have a tablerow and in that tablerow i have 6 edit text boxes and i want to set the layout margins for that 6 edit text boxes TableLayout t1=(TableLayout)findViewById(R.id.table_layout01); TableRow tr1=new TableRow(inventory.this); tr1.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT)); tr1.setBackgroundColor(Color.BLACK); EditText ed6=new EditText(inventory.this); //ed6.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT

问题 I am trying to draw an ellipse in Qt and the border on the edges goes thin in some places. Here is the code: QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing, true); painter.setPen(QPen(Qt::black, 3)); painter.drawEllipse(event->rect()); Any ideas? Thanks in advance. 回答1: When painting a shape with an outline, you have to factor in the width of the pen. So in your case, change to this: // Adjusted by 2 pixels because half your pen width is 1.5, but QRect is // for integer

问题 I am computing a series of index from a 2D points (x,y). One index is the ratio between minor and major axis. To fit the ellipse i am using the following post when i run these function the final results looks strange because the center and the axis length are not in scale with the 2D points center = [ 560415.53298363+0.j 6368878.84576771+0.j] angle of rotation = (-0.0528033467597-5.55111512313e-17j) axes = [0.00000000-557.21553487j 6817.76933256 +0.j] thanks in advance for help import numpy

问题 I am writing an iPad app in which I am rendering XML objects that represent shapes into graphics on the screen. One of the objects I am trying to render is arcs. Essentially these arcs provide me with a bounding rectangle as well as a start and end angle. Given attributes: x y width height startAngle endAngle With these values I need to draw the arc (which is essentially part of an ellipse). I can not use the following: UIBezierPath *arc = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(x,

问题 I have an ellipse, defined by Center Point, radiusX and radiusY, and I have a Point. I want to find the point on the ellipse that is closest to the given point. In the illustration below, that would be S1. Now I already have code, but there is a logical error somewhere in it, and I seem to be unable to find it. I broke the problem down to the following code example: #include <vector> #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <math.h> using namespace std;

问题 I have an ellipse, defined by Center Point, radiusX and radiusY, and I have a Point. I want to find the point on the ellipse that is closest to the given point. In the illustration below, that would be S1. Now I already have code, but there is a logical error somewhere in it, and I seem to be unable to find it. I broke the problem down to the following code example: #include <vector> #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <math.h> using namespace std;