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  • How to clip a rectangle from a tiff?

    - by TooFat
    I have a Winforms Gui in C# that allows a user to draw a rectangle on a display of a tiff and save the position, height, width etc. Basically, what I want to do is take the saved position, height and width of the rectangle and clip that area into a sep. bitmap that can then be passed to sep. method that will just OCR the new clip of the bitmap only. What is the best way to do this?

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  • Delete rectangle using .NET?

    - by C. Karunarathne
    Can I delete the old rectangle which I have drawn and draw a new rectangle? private void panel1_MouseClick(object sender, MouseEventArgs e) { Graphics g = this.panel1.CreateGraphics(); Pen pen = new Pen(Color.Black, 2); g.DrawRectangle(pen, 100,100, 100, 200); g.dispose(); }

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  • Possible to do rounded corners in custom Progressbar progressDrawable?

    - by b-ryce
    I have a progress bar that is supposed to look like the attached image: And I've made it a long way. I'm very close the only part that isn't working is the rounded corners for the progressDrawable. Here is what mine looks like. (Notice, circled in red, that the fill inside the white outline does not have rounded corners): So, I've found a couple of ways to make this work when the progress bar is colored in with a shape, gradient, or color. BUT, I can't get it with an image as the progressDrawable. Here is my class that extends ProgressBar public class RoundedProgressBar extends ProgressBar{ private Paint paint; public RoundedProgressBar(Context context) { super(context); setup(); } public RoundedProgressBar(Context context, AttributeSet attrs) { super(context, attrs); setup(); } public RoundedProgressBar(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setup(); ; } protected void setup() { paint = new Paint(); } @Override protected synchronized void onDraw(Canvas canvas) { // First draw the regular progress bar, then custom draw our text super.onDraw(canvas); paint.setColor(Color.WHITE); paint.setStyle(Paint.Style.STROKE); RectF r = new RectF(0,0,getWidth()-1,getHeight()-1); canvas.drawRoundRect(r,getHeight()/2,getHeight()/2, paint); } } Here is my selector: <layer-list xmlns:android="http://schemas.android.com/apk/res/android" > <item android:id="@android:id/background" android:drawable="@drawable/slider_track" /> <item android:id="@android:id/secondaryProgress" android:drawable="@drawable/slider_track" /> <item android:id="@android:id/progress" android:drawable="@drawable/slider_track_progress" /> </layer-list> Here are the images used in the selector: slider_track- slider_track_progress- Here is where I embed my progressbar in the layout for my activity <com.android.component.RoundedProgressBar android:id="@+id/player_hp_bar" android:layout_width="fill_parent" android:layout_height="36dip" android:layout_marginLeft="30dip" android:layout_marginRight="30dip" android:max="100" style="?android:attr/progressBarStyleHorizontal" android:progressDrawable="@drawable/slider_layer_list" android:progress="20" android:maxHeight="12dip" android:minHeight="12dip" /> Anyone know how to make this work?

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  • Pre-drawing a UIView

    - by LK
    There is information that is only available after drawRect that I need to access when loading a UIView. Is there any way to do a "pre-draw" or offscreen in order to get this information earlier?

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  • Managing the interval for horizontal axis in flex

    - by Roshan
    Hi Guys, How can we manage the horizontalaxis interval in flex chart? What actually happening is , the data is inserted between two interval levels and its causing readability problem when we draw line grids in graph. The data point is shown in between the data grids. How can we move the axis or manage the data points?

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  • Drawing Mirrored Text

    - by Jeff
    I'm trying to draw mirrored (as in, it looks like you held it up to a mirror) text, and I want to do it the easiest way possible. It is possible to do a transform on a UILabel? Or do I have to use Quartz and do CGContextShowTextAtPoint() ?

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  • How could I make geometry advanced operations on bezier paths?

    - by yizzreel
    I have a library that draws regular bezier path figures (complex paths formed of a lot of bezier points), using midpoint approximation. I can draw them without problem, but I need to add support for advanced geometry operations: Nearest point of a curve, intersection, figure contains point, and more importantly, path combinations: difference, intersection, exclusive-or, union, ... Is there any good source to get all this? Thanks

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  • line is erasing in java

    - by Gogoo
    I make an Application in java and draw rectangle. When I search from combobox the rectangle is under the combobox and when I close combobox some parts of the rectangle which was under the combobox is deleted. How can I make rectangle to be visible after the combobox was closed.

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  • make a 3D spotlight cone matrix

    - by Soubok
    How to create the transformation matrix (4x4) that transforms a cylinder (of height 1 and diameter 1) into a cone that represents my spotlight (position, direction and cutoff angle) ? --edit-- In other words: how to draw the cone that represents my spotlight by drawing a cylinder through a suitable transformation matrix.

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  • How to rotate 3D axis(XYZ) using Yaw,Pitch,Roll angles in Opengl

    - by user3639338
    I am working Pose estimation with capturing from camera with Opencv. Now I had three angle(Yaw,Pitch,Roll) from each frame(Head) using my code.How to rotate 3D axis(XYZ) those three angle using opengl ? I draw 3D axis using opengl. I have Problem with rotate this axis for returning each frame(Head) using VideoCapture camera input from my code.I cant rotate continuously using returning three angle my code.

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  • How do you composite an image onto another image with PIL in Python?

    - by Sebastian
    I need to take an image and place it onto a new, generated white background in order for it to be converted into a downloadable desktop wallpaper. So the process would go: 1) Generate new, all white image with 1440x900 dimensions 2) Place existing image on top, centered 3) Save as single image In PIL, I see the ImageDraw object, but nothing indicates it can draw existing image data onto another image. Suggestions or links anyone can recommend?

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  • Are there existing web sites that use a photo as a electronic signature?

    - by Alessandro Vernet
    The use case: to sign a electronic document, users view the document, and if they agree take a picture of themselves with their webcam (done through Flash from the browser). Then a PDF is generated containing the document and the picture in place of signature. This is a biometric signature, which is not as strong as a digital (cryptographic) signature, but stronger than having users draw their signature, as a photo is harder to forge than a drawn signature. Has anyone seen this technique being used on an existing web site?

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  • How do you implement position-sensitive zooming inside a JScrollPane?

    - by tucuxi
    I am trying to implement position-sensitive zooming inside a JScrollPane. The JScrollPane contains a component with a customized 'paint' that will draw itself inside whatever space it is allocated - so zooming is as easy as using a MouseWheelListener that resizes the inner component as required. But I also want zooming into (or out of) a point to keep that point as central as possible within the resulting zoomed-in (or -out) view (this is what I refer to as 'position-sensitive' zooming), similar to how zooming works in google maps. I am sure this has been done many times before - does anybody know the "right" way to do it under Java Swing?. Would it be better to play with Graphic2D's transformations instead of using JScrollPanes? Sample code follows: package test; import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import javax.swing.*; public class FPanel extends javax.swing.JPanel { private Dimension preferredSize = new Dimension(400, 400); private Rectangle2D[] rects = new Rectangle2D[50]; public static void main(String[] args) { JFrame jf = new JFrame("test"); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jf.setSize(400, 400); jf.add(new JScrollPane(new FPanel())); jf.setVisible(true); } public FPanel() { // generate rectangles with pseudo-random coords for (int i=0; i<rects.length; i++) { rects[i] = new Rectangle2D.Double( Math.random()*.8, Math.random()*.8, Math.random()*.2, Math.random()*.2); } // mouse listener to detect scrollwheel events addMouseWheelListener(new MouseWheelListener() { public void mouseWheelMoved(MouseWheelEvent e) { updatePreferredSize(e.getWheelRotation(), e.getPoint()); } }); } private void updatePreferredSize(int n, Point p) { double d = (double) n * 1.08; d = (n > 0) ? 1 / d : -d; int w = (int) (getWidth() * d); int h = (int) (getHeight() * d); preferredSize.setSize(w, h); getParent().doLayout(); // Question: how do I keep 'p' centered in the resulting view? } public Dimension getPreferredSize() { return preferredSize; } private Rectangle2D r = new Rectangle2D.Float(); public void paint(Graphics g) { super.paint(g); g.setColor(Color.red); int w = getWidth(); int h = getHeight(); for (Rectangle2D rect : rects) { r.setRect(rect.getX() * w, rect.getY() * h, rect.getWidth() * w, rect.getHeight() * h); ((Graphics2D)g).draw(r); } } }

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  • What are useful functions for drawing text (MFC)?

    - by kobac
    I'm creating a line chart control, and I need to write (or better say draw) the axis names and axis values. I found DrawText and TextOut functions, but the text they show is flickering and don't know how to set the font and text orientation (I will need vertical text orientation as well as horizontal). Are there any other functions you could recoommend or how to use these stated above and get the results I need? Thanks in advance. Cheers.

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  • Symmetric drawing of a Graph

    - by xxxxxxx
    is there any known algorithm(or package with the algorithm already implemented) to draw a graph in a way that it has symmetry ? for example most of these show symmetry. but putting the nodes evenly distributed on a circle isn't the best way to symmetry is exposed.

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  • Will GTK's pango and cairo work well in Coca and MFC applications.

    - by Lothar
    I'm writing a GUI program and decided to go native on all platforms. But for all the stuff i need to draw myself i would like to use the same drawing routines because font and unicode handling is so difficult and complex. Do you see any negative points in useing Pango/Cairo. Well on MacOSX i havent succeded installing Pango/Cairo yet. Looks like a bad Omen.

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  • Build hierarchical chart using flex and action script

    - by jk
    i want to develop an application using flex 4 sdk with eclipse and action script. i need to draw the hierarchy chart dynamically and save it. should be able to label all the nodes at runtime, should able to view all charts created previously saved chart. i need source code for this sample application http://live.yworks.com/graphity/ thanks in advance

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