draw

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . SQL Server has a spatial type "circularstring" that is collection of odd points. How can I draw this type in c#. Drawarc works based on angles while in circularstring we have just points. Drawcurve works based on the points but the result is not the same as circularstring. With

问题 I'm programming in C with GLUT and OPENGL, i want my window redrawing itself again and again. I know that i can rerender with glutPostRedisplay() , if I put it in the idle function of Glut my pc lags. My code is following atm void on_idle() { glutPostRedisplay(); } void on_draw() { ... glClearColor(1.f, 1.f, 1.f, 1.f); glClear(GL_COLOR_BUFFER_BIT); ... glFlush(); } int main(int argc, char** argv) { ... glutDisplayFunc(&on_draw); glutIdleFunc(&on_idle); ... } 回答1: Try this: void on_timer(int

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I can find plenty of examples of how to draw a line in vb.net online. I however I cannot find any examples of how to draw lines at a

问题 I'm using Visual Studio Express 2012. I have a main background image, and I want to skew an image and add it to the main background. So far I have this: 'Create a new bitmap image of the transparent image Dim overlay As New Bitmap("C:\TestFolder\rectangle.png") 'Create a new bitmap image of the image to you want the transparent image drawn onto Dim pic As New Bitmap("C:\TestFolder\MyImage.png") 'Create a graphics object from the image to be drawn onto Dim grx As Graphics = Graphics.FromImage

问题 I want to draw both rectangle and square using same var rectangle in my program. I have modified the function to draw square, given modeOptions = { "Rectangle", "Square" } what needs to be added below to work for both, rectangle and square. Please suggest. Thanks Can also see the question at : http://jsfiddle.net/farey/qP3kV/6/ var rectangle=(function() { var inDrag=false,downPos,upPos; var obj; // temporary length for square var temp; return { fillStyle: "none", strokeStyle: "blue",

问题 I'm using cv2.rectangle in python to draw a box on my image. image1 has already been loaded correctly. Then I use this code: cv2.rectangle(image1, (10, 10), (100, 100), (255,0,0), 2) cv2.imshow('img', image1) But I get this error: TypeError: Layout of the output array img is incompatible with cv::Mat (step[ndims-1] != elemsize or step[1] != elemsize*nchannels) I get errors no matter what I do with the image after using cv2.rectangle . How can I retrieve or use the image on which I drew the

问题 In pyglet, which I'm learning, Image.blit() works, but Sprite.draw() doesn't, nor Batch.draw(), even in this simple code: import pyglet win = pyglet.window.Window() img = pyglet.resource.image('test.png') spr = pyglet.sprite.Sprite(img) @win.event def on_draw(): win.clear() spr.draw() if __name__ == '__main__': pyglet.app.run() The window remains black. However, I can draw labels, for example. THe only explaination I found was about graphic cards and "v2i" bugs with some of them, but I'm

问题 I am adding a row to my datatables by selecting an option from my selectbox: <select class="item-select"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="vw">VW</option> <option value="audi">Audi</option> </select> $(document).on('change', '.item-select', function() { var optionValue = $(this).val(); var optionText = $('.item-select option[value="'+optionValue+'"]').text(); table.row.add({ "id": optionValue, "name": optionText, }).draw(); }); It is

问题 So I have a JPanel that's inside a JScrollPane . Now I am trying to paint something on the panel, but it's always in same spot. I can scroll in all directions but it's not moving. Whatever I paint on the panel does not get scrolled. I already tried: A custom JViewPort switching between Opaque = true and Opaque = false Also I considered overriding the paintComponent method of the panel but that would be really hard to implement in my code. public class ScrollPanePaint{ public ScrollPanePaint()

问题 I want to draw objects to be partially transparent, but I don't know how. I'm using MSDN and coding in C++. The following code is how I draw a regular rectangle, but I want to draw a transparent rectangle. VOID DrawingObject::Draw() { ID2D1HwndRenderTarget *m_pRenderTarget; m_pRenderTarget->FillRectangle(RectF(10, 10, 20, 20), m_pD2DDriver->GetBrush(static_cast<DrawingColor>(m_uColorIndex)) ); } Any help or guidance is greatly appreciated. 回答1: Have a look at the Brush Interface. You can