Re: graphics quality very poor, how to improve? - Graphics Discussion Boards

graphics quality very poor, how to improve?

joost.versteegen16-Jun-13 20:27

16-Jun-13 20:27

I'm loading a image into the graphics of a form, but the quality is very poor. How to improve? The original image is 48*48 (96dpi). Here's my code:

public partial class Form1 : Form
  {
    private ImageList ObjImageList;
    private int OPERSTEP_SIZE = 48;

    public Form1()
    {
      InitializeComponent();

      ObjImageList = new ImageList();
      ObjImageList.Images.Add("prodstep", Image.FromFile("ProdStep_BW.gif"));

      this.Paint += new PaintEventHandler(Form1_Paint);
    }

    void Form1_Paint(object sender, PaintEventArgs e)
    {
      Graphics g = e.Graphics;
      g.DrawImage(ObjImageList.Images["prodstep"], new Rectangle(20, 20, OPERSTEP_SIZE, OPERSTEP_SIZE));
    }
  }

Re: graphics quality very poor, how to improve?

Marco Bertschi25-Jun-13 23:10

Marco Bertschi

25-Jun-13 23:10

The easiest way would probably be to use an image with a higher resolution than 48*48 but still display it as 48*48 - Are you sure the displayed image on the form is still 48*48?

cheers,
Marco

Marco Bertschi

CodeProject 10 Million members celebration meetup - Switzerland

Re: graphics quality very poor, how to improve?

MaulikDusara26-Jun-13 9:00

MaulikDusara

26-Jun-13 9:00

Please refer give links:
Professional C# - Graphics with GDI+[^]
Drawing smooth text and pictures on the extended glass area of your WinForm in Windows Vista[^]

Maulik Dusara
Sr. Sofware Engineer

Re: graphics quality very poor, how to improve?

joost.versteegen26-Jun-13 22:11

joost.versteegen

26-Jun-13 22:11

Thanks for the information, i will check it out!

Re: graphics quality very poor, how to improve?

Kamran Ayati16-Sep-13 1:29

Kamran Ayati

16-Sep-13 1:29

you can use directx or gdi +
tell me more about your question to help u .

Re: graphics quality very poor, how to improve?

Mr. Nand Lal Gordhan Das Bheel10-May-14 20:03

Mr. Nand Lal Gordhan Das Bheel

10-May-14 20:03

install graphics drivers on ur pc

Raisal

Re: graphics quality very poor, how to improve?

Tino Fourie12-Jul-14 11:56

Tino Fourie

12-Jul-14 11:56

I did not find in the OP's question that he / she was having general problems with the quality of his / her display. The OP made it very clear that when he / she loads an image with a 48x48 dimension that the image he / she loaded was of poor quality.

It is important that you understand the question before you post an absurd reply like you have just did. You should be ashamed of yourself.

Re: graphics quality very poor, how to improve?

Tino Fourie12-Jul-14 12:02

Tino Fourie

12-Jul-14 12:02

An image with a dimension of 48x48 literally means that you have an image consisting of 48 * 48 pixels. If you load that image into a control with an Image property, and the said control's dimension are bigger than that of the image itself, the image will be stretched (zoomed) to fit the dimension of the control.

However, in a Picturebox you can control how an image is displayed - zoomed, stretched, centered, etc. As mentioned before, try and use a higher resolution image. Higher resolution means a higher number of pixels. That will give you an image file with a greater dimension. The control you are using the display the image (other than a picturebox) will fit the image according to its own dimensions and not that of the image.

Make sure that the control's dimensions are relative to that of the image to prevent the image from being distorted.

Useage about OPCODE collision detection

Henry Hong4-Jun-13 15:23

Henry Hong

4-Jun-13 15:23

I want to know whether opcode can give me the messages besides triangle. As mesh defined in the opcode is consist of triangles, but most of my model is constructed using polygons, so before my collision qurey, I have to transform the polygons to triangles, but i want to know wether i could know which polygon the triangles detected are belong to. if the anwser is yes, how can i get the message?

I had got the resource from the OPCODE net address, and i also have read the mannual about the OPCODE, but as I wanted to learn some details about the OPCODE, I found it was difficult. And i had got the two projects "opcode" and "CDTestFramework" from that address. because i had not found the information about how to get which polygon the detected triangle is belong to in the user mannual. i hoped to find my anwser in the two projects above, but I find it was difficult to read the code in the two projects. if you had some experience about using OPCODE, i really wished you could give some suggestion about how to read the two projects. And as the most important one of my requests is to get the polygons, so if you know, can you tell me is there any manner i can get the polygons. If the answer is NO, i think I have to think about take us of other detection manners.

Re: Useage about OPCODE collision detection - REPOST

Richard MacCutchan4-Jun-13 22:03

Richard MacCutchan

4-Jun-13 22:03

Please don't repost the same question in multiple forums. You already have an answer to this question at http://www.codeproject.com/Messages/4579912/Useage-about-OPCODE-collision-detection.aspx[^].

Use the best guess

Re: Useage about OPCODE collision detection - REPOST

Henry Hong4-Jun-13 22:09

Henry Hong

4-Jun-13 22:09

While, as i have not got some answers in the C/C++/MFC, i hope i can get some help in other discussions, I can not find is there any improper?

Re: Useage about OPCODE collision detection - REPOST

Richard MacCutchan4-Jun-13 23:31

Richard MacCutchan

4-Jun-13 23:31

You have already been given the answer; reposting in other forums is not likely to change that.

Use the best guess

OpenGL 3.0 Square is being drawn behind another Square

mrpeed1-May-13 12:51

mrpeed

1-May-13 12:51

Im writing a paint program in openGL 3.0, it works fine so far
except that when I try and draw a square over another square it is drawn
behind it instead of on top of it. How can I fix this so that
I can draw on top of an image? Why would this happen?

C++
OpenGL3.0

Re: OpenGL 3.0 Square is being drawn behind another Square

Santhosh G_27-May-13 6:23

Santhosh G_

27-May-13 6:23

Enable Depth test to draw objects beyond others.
glEnable( GL_DEPTH_TEST );
glDepthFunc( GL_LESS ); // Near objects will be displayed. object with z -3 displayed on top of object with z -4

If you are creating an app similar to MSPAINT, setup projection matrix with glOrtho().
glOrtho() is used because it creates an orthographic projection, therefore the size of rendered image of same size with different z value will be same.

Provide different z values for each objects, based on their z order in the screen.
ie, z value of the object drawn at first should be as small, say 1.
Then increase z value of each new objects.

Render code should be like this.

// set depth range and clear depth value.
glDepthRange(-100, 100);
glClearDepth(100);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

// Set projection.
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho(-20,20,-20,20,0, 100 );

glEnable( GL_DEPTH_TEST );
glDepthFunc( GL_LESS );

// No model view transformation.
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();

// Draw object 1
glColor3f(0,0,1);
glBegin( GL_TRIANGLES );
glVertex3f( 0,0, -3 );
glVertex3f( 1,1, -3 );
glVertex3f( 0,1, -3 );
glEnd();

// Draw Object 2. Here z is -2, it will be displayed on top of object -3
glColor3f(1,0,0);
glBegin( GL_TRIANGLES );
glVertex3f( 0,1, -2 );
glVertex3f( 1,1, -2 );
glVertex3f( 1,0, -2 );
glEnd();

SwapBuffers( m_hDC );

Gestures, jestures, and swipes - implementation fundamentals

charlieg10-Apr-13 11:51

charlieg

10-Apr-13 11:51

Someone has inquired if <insert random="" computer="" device=""> will support gestures such as swipe. I've already written the code to reboot the device if you give it the middle finger Poke tongue | ;-P

Seriously, I'm looking for articles and descriptions of the underlying technology and approach for implementing a page swipe. I can visualize that I'm working with off-screen images and moving in a column at a time, but this would seem quite tedious at the Win32 level (which is where I'm working).

Resource suggestions?

thanks

Charlie Gilley
<italic>You're going to tell me what I want to know, or I'm going to beat you to death in your own house.

"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759

Re: Gestures, jestures, and swipes - implementation fundamentals

Pete O'Hanlon10-Apr-13 12:14

Pete O'Hanlon

10-Apr-13 12:14

What type of swipe? Touching the screen? In mid air?

I was brought up to respect my elders. I don't respect many people nowadays.

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Re: Gestures, jestures, and swipes - implementation fundamentals

charlieg10-Apr-13 23:23

charlieg

10-Apr-13 23:23

There's my ignorance kicking in... what is a swipe?

I've become familiar with a couple of gestures - found a good article on wiki:
http://en.wikipedia.org/wiki/Multi-touch[^]

So, in the context of a gesture, a swipe would be a scroll or flick, as you would expect on your smart phone to move to the next page.

Re: Gestures, jestures, and swipes - implementation fundamentals

Pete O'Hanlon10-Apr-13 23:34

Pete O'Hanlon

10-Apr-13 23:34

I've been working heavily in Perceptual Computing for the last few months. A swipe is a single longer movement in any direction - in the case of PerC, this would be a swipe in mid air.

I was brought up to respect my elders. I don't respect many people nowadays.

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Re: Gestures, jestures, and swipes - implementation fundamentals

charlieg10-Apr-13 23:53

charlieg

10-Apr-13 23:53

Fair enough. But if you do receive this "event", the application responds to it in some fashion. In the case of a smart phone, they might "smoothly scroll the page". And it's at that level I'm living in at the moment. I'm curious how it's generally implemented... the smooth scrolling or page animation if you prefer.

Re: Gestures, jestures, and swipes - implementation fundamentals

Pete O'Hanlon11-Apr-13 0:03

Pete O'Hanlon

11-Apr-13 0:03

Ah, I see what you're getting at. Well, it certainly depends on the development environment you are using. I use WPF, which provides inbuilt access to animation - I would simply hook into that. If you're using Win32, then you're going to have a lot more work because you're going to be hooked into GDI+.

I was brought up to respect my elders. I don't respect many people nowadays.

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Re: Gestures, jestures, and swipes - implementation fundamentals

charlieg11-Apr-13 0:16

charlieg

11-Apr-13 0:16

I actually think I'll have to go below Win32. I have some algorithms worked up, and we'll see later this morning if the processor can keep up with what I need to do.

I suspect that most implementations have hardware acceleration of some sort to aid the process.