Need help on how to move line between two horizontal sliders with slider position [modified]

[John502]

Hi, I want to move one line between two horizontal sliders, with respect to slider position... I am able to move slider tic, but not able to move line to exact sliders tic... Is there any way to get pixels information from the slider control.. If so please kindly let me know ... It is very urgent requirement for me.. Thanks in advance..

modified on Tuesday, February 17, 2009 10:17 AM

[_Superman_]

It should be possible to use GetWindowRect on the slider control to get the total width of the slider and then the GetPos method to get the current tic position to calculate the width of the line you want to draw.

«_Superman_»

[John502]

Hi, I have tried with your solution, I am calling m_pDlg->m_slider_bar1.GetWindowRect(&rect1); this control from my app for getting pixels position. after that i am trying to change the slider position like below mentioned way: int pos = m_pDlg->m_slider_bar1.GetPos(); m_pDlg->m_slider_bar1.SetPos(slide_pos); m_pDlg->m_slider_bar2.SetPos(slide_pos); every time i am getting rectangle pixels like :- 86,110,283,565 only. how i have to move line now to moved position. please kindly help me regarding this.. Thanks in advance..

modified on Tuesday, February 17, 2009 10:18 AM

[John502]

Hi Can you please kindly help me on this ASAP, as it is very urgent requirement for me..

[_Superman_]

If slider range has been set from 0 to 100 and SetPos returns 50, you know that it is 50%. So the position of the tic is at (283 - 86) / 2. Now you can do a MoveTo and LineTo from X1 which is ((283 - 86) / 2, bottom of slider1) to X2 which is at ((283 - 86) / 2, top of slider 2).

«_Superman_»

[John502]

Hi Superman, I have written the code like this, but still it's not working while (slide_pos <= 100) { m_pDlg->m_slider_bar1.GetWindowRect(&rect1); m_pDlg->m_slider_bar2.GetWindowRect(&rect2); int pos = m_pDlg->m_slider_bar1.GetPos(); m_pDlg->x1 = ((rect1.left-rect1.top)/100); m_pDlg->y1 = rect1.bottom; m_pDlg->x1 = ((rect1.left-rect1.top)/100); m_pDlg->y2 = rect2.top; m_pDlg->m_slider_bar1.SetPos(slide_pos); m_pDlg->m_slider_bar2.SetPos(slide_pos); slide_pos = slide_pos + 5; m_pDlg->InvalidateRect(NULL); Sleep(1000); } rect1 values are :- top=86,bottom=110,left=283,right=565 rect2 values are :- top=259,bottom=283,left=283, right=565. Can you please look into the code what i have written and let me know where i did wrong..?

modified on Tuesday, February 17, 2009 10:18 AM

[_Superman_]

It looks like I have mis-interpreted your question. Let me try and get it right. You have 2 sliders. When one of the slider is moved you want the other one also to move along. Is that what you need?

«_Superman_»

[John502]

Hi, Yes that is only the part of my requirement. I have two horizontal sliders on my dialog. Now i want to create one verical line in between the two sliders. Whenever i have clicked on Start button then slider tics will get moved and incremented by 5, i am able to move two slider tics at the same time. but now what i want is to move line along with the tics. I am not able the slider position where it is exactly moved in terms of pixels.

modified on Tuesday, February 17, 2009 10:29 AM

[_Superman_]

You can get the (x1, y1) and (x2, y2) positions for drawing the line using the following code

m_slider1.GetThumbRect(&rect1);
m_slider2.GetThumbRect(&rect2);

m_slider1.ClientToScreen(&rect1);
m_slider2.ClientToScreen(&rect2);

ScreenToClient(&rect1);
ScreenToClient(&rect2);

int x1 = rect1.left + ((rect1.right - rect1.left) / 2);
int y1 = rect1.bottom;
int x2 = x1;
int y2 = rect2.top;

Then you can draw the line using the following code

CDC* pDC = GetDC();

CPen pen(PS_SOLID, 1, RGB(0, 0, 0));
pDC->SelectObject(&pen);

pDC->MoveTo(x1, y1);
pDC->LineTo(x2, y2);

ReleaseDC(pDC);

You may need to erase the previously drawn line. For that you will need to store the previous line coordinates and draw over it using the same color of the dialog.

«_Superman_»

[John502]

Hi Superman, Thanks for your effort on this..I am able to move slider position correctly, but not able to move along with the sliders, below i am copying my code snippet, please review it and let me know where i am doing wrong..? Below code i have written in OnStart funciton():- int slider_pos = 5; while(slider_pos <= 50) { m_slider1.GetThumbRect(&rect1); m_slider2.GetThumbRect(&rect2); m_slider1.ClientToScreen(&rect1); m_slider2.ClientToScreen(&rect2); ScreenToClient(&rect1); ScreenToClient(&rect2); m_slider1.SetPos(slider_pos); m_slider2.SetPos(slider_pos); int x1 = rect1.left + ((rect1.right - rect1.left) / 2); int y1 = rect1.bottom; int x2 = x1; int y2 = rect2.top; slider_pos += 5; InvalidateRect(rect1,FALSE); InvalidateRect(rect2,FALSE); Sleep(1000); } Below i have written in OnPaint() CDC* pDC = GetDC(); pDC->MoveTo(old_x1,old_y1); pDC->LineTo(old_x2,old_y2); pDC->MoveTo(x1,y1); pDC->LineTo(x2,y2); old_x1 = x1; old_y1 = y1; old_x2 = x2; old_y2 = y2; Please help me regarding this..? Thanks in advance..

[_Superman_]

You are using x1, y1, x2 and y2 in 2 functions. I'm assuming you're creating the variables as member variables. If so remove the int keyword from within the while loop. Also, in OnPaint you must call BeginPaint instead of GetDC. And instead of 2 InvalidateRect calls, do a single Invalidate call.

«_Superman_»

[John502]

Hi, I made these changes, PAINTSTRUCT ps; CDC* paintDC = BeginPaint(&ps); //paintDC->MoveTo(old_x1,old_y1); //paintDC->LineTo(old_x2,old_y2); paintDC->MoveTo(x1,y1); paintDC->LineTo(x2,y2); old_x1 = x1; old_y1 = y1; old_x2 = x2; old_y2 = y2; EndPaint(&ps); but line is displaying at last slider position, that to in wrong pixels.. can you please tell me where i am doing wrong..? Thnaks in advance..