graphics

问题 As you can see below, the images of the little missiles are not over the lines. How can I create an offset that respects the angle and rotation. I am using linear interpolation to extract x y coordinates between the ends of each straight line. float xDiff = end_xpos[i] - start_xpos[i]; float yDiff = end_ypos[i] - start_ypos[i]; double degrees = Math.Atan2(yDiff, xDiff) * 180.0 / Math.PI; double radians = (Math.PI / 180) * degrees; args.DrawingSession.DrawLine(start_xpos[i], start_ypos[i], end

问题 I'm trying to code a program, that reads an Image into a BufferedImage, paint it on the JFrame, paint circles in it, and writes it to a File. The following code will do all of it except the content of the saved file. The saved image only contains the untouched BufferedImage. No Circles ;) I already treid to figure it out by changing and adding some code, but it didn't help a lot. public class PaintImage extends Component { BufferedImage img; private int pngWidth, pngHeight; public int

问题 I'm using the Drawstring method of the Graphics Class to Draw a Text on an Image.The Font is Specified before drawing. G.DrawString(mytext, font, brush, 0, 0) The Problem arises when the same text is drawn on an image with smaller size.The Text drawn appears to be larger.I'm looking for a solution to alter the font size according to the image size so that the text don't appear larger or smaller when drawn on images of different sizes. I'm attaching the images with different sizes with the

问题 I have two ellipsoids in R3 described in terms of their centre points (P), their axes lengths (a,b,c), and their rotation vector (R). I wish to interpolate a tubular structure between these two ellipsoids along a given centre line. This is done by creating an ellipsoid centred at each point along the centre line. Its axes lengths are interpolated linearly between those at the two endpoints, and the rotation is obtained as a quaternion using spherical linear interpolation, or SLERP. I

问题 I currently have a small Java program which I would like to run both on the desktop (ie in a JFrame) and in an applet. Currently all of the drawing and logic are handled by a class extending Canvas. This gives me a very nice main method for the Desktop application: public static void main(String[] args) { MyCanvas canvas = new MyCanvas(); JFrame frame = MyCanvas.frameCanvas(canvas); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); canvas.loop(); } Can I do something similar for the

问题 I have written a simple raytracer (the code is here but you don't have to debug it). It can render simple meshes: It looks pretty cool, I think. There is no reflection in the raytracer and the pixels are shaded solely based on their interpolated normals. However, if you zoom up you see that there are rendering artifacts all over it: My question is, what is causing these "dots" on the model? I know it must have something to do with the intersection test because here is the same model rendered

问题 I'm trying to draw a triangle with a border using the Graphics.drawPolygon() method The triangle is properly drawn, but how can I calculate the 3 points of the border? I already did it with a circle, but I can't seem to find a solution for triangle. A requirement of the instructor as that it cannot use Graphics2D . My code: if (xPoints != null && yPoints != null) { int[] nXPoints = new int[] { xPoints[0] - borderThickness, xPoints[1] - borderThickness, xPoints[2] - borderThickness }; int[]

问题 Completing questions on how to plot a ConvexHull or a DelaunayTriangulation using Graphics in Mathematica, I would now like to plot the VoronoiDiagram within Graphics. Considering : Needs["ComputationalGeometry`"] pts = RandomReal[{0, 10}, {60, 2}]; vdpts=VoronoiDiagram[pts] 回答1: How about Needs["ComputationalGeometry`"] pts = RandomReal[{0, 10}, {10, 2}] DiagramPlot[pts] or am I missing your point? 来源： https://stackoverflow.com/questions/6477753/plot-voronoidiagram-using-graphics-in

问题 I have been trying for the last week to find a way to make JFreeChart display something similar to the image below. Basically you are looking at three series (upper, middle, lower) with a fill inbetween. And underneath there is a (light green) fill color, or an area chart as some would perhaps call it - no meaning, just for looks. The only thing really missing from what I have come up with is the last part: the fill underneath / area chart: I even tried to subclass XYDifferenceRenderer and

问题 tl;dr If you run both code snippets below ( note: code was previously broken, but now is fixed and has been checked on multiple computers ), you will see two plots of some raster data. One uses ggplot2 and produces a smoothed image with high-resolution coastlines that are somehow inherited from the polygons that I used to mask the raster. Without using ggplot2, we can get the smoothed image using raster::plot(... , interpolate='bilinear') or rasterImage(interpolate = TRUE) . But the