1. H O N O R S C O M P U T E R P R O G R A M M I N G I
Module 14
2. Objective/Essential Standard
Essential Standard
8.00 Apply procedures to develop graphics applications
Indicator
8.01 Understand coordinate systems. (3%)
8.02 Apply Procedures to Create Picture Boxes Using Images.
(5%)
3. Coordinate Systems
With Visual Studio, any object, whether it is a form or a
label uses the same coordinate system.
The top left corner, or the origin is 0, 0.
The bottom right corner is the width and height of the
control (in this case, the label).
0, 0
Width, Height
4. Coordinate Systems
The default coordinate system is made up of rows
and columns of pixels.
The pixels are the smallest points you can locate on the form.
5. Coordinate Systems
As you increase the x, you move across to the right.
As you increase the y, you move down.
(0, 0)
x = 50
Y = 50
(50, 50)
6. Coordinate Systems
You can also indicate the width of the object by using its
Width property.
Likewise you can indicate the height of the object using
its Height property.
0, 0
lblDraw.Width
lblDraw.Height
7. Coordinate Systems
To indicate the form’s height
maxHeight = Me.Height
To indicate the form’s width
maxWidth = Me.Width
You can use the Height and
Width properties to set
relative positions.
Form’s Width
and Height
8. Adding Images to Your Project
1. In the Solution Explorer,
double-click My Project
2. The following is displayed.
9. Adding Images to Your Project
3. Select the Resources tab.
4. Go to the Strings tab
click the drop-down arrow.
Select Images
5. Go to the Add Resource tab
click the drop-down arrow.
6. To add an existing image, select Add Existing.
To create and add an image, select New Image,
then the image type.
10. PictureBox Control
The PictureBox control displays an image.
The image can be one of the following formats.
Bitmap
GIF
JPEG
Best use
Enhanced Metafile
Icon
11. Adding A PictureBox Control
Click the PictureBox control in the ToolBox.
Draw the rectangular picture box on your form.
Set the Properties.
12. PictureBox Control
PictureBox Properties Description
(Name) The name of a PictureBox should start with pic
Image Sets the image to display in the PictureBox
SizeMode
Normal (Default)
StretchImage
AutoSize
CenterImage
Zoom
Controls the image sizing and position
places in the top-left corner of the Picture Box
resizes the image to fit the PictureBox
resizes the PictureBox to fit the image
puts the image in the middle of the PictureBox
resizes the image to fit the PictureBox but maintains the
original ratio
PictureBox Event Description
Click Occurs when the user clicks the PictureBox
13. Adding Images to the PictureBox Control
Select the PictureBox
Click in the Image property area
The Ellipsis displays.
The Select Resource dialog displays
15. Adding Images to the PictureBox Control
Your image will be added to the list.
16. Using the PictureBox
You can set the Image property during runtime
Me.PictureBox.Image = My.Resources.ImgName
Example
17. Changing How the Image Displays
Remember the SizeMode property of the PictureBox
will change how the image is displayed.
To change how the image is displayed at runtime,
you can change the SizeMode property.
Me.PictureBox.SizeMode = PictureBoxSizeMode.SizeModeValue
Where the SizeModeValue is one of the choices given: Normal
(Default), StretchImage , AutoSize, CenterImage, Zoom
18. Animation and Timers
What if a programmer wanted to load multiple
images to simulate animation?
This requires VB to lay one image on top of another
to create the illusion of animation.
This may be done using a new object from the
components area of your toolbox called a timer.
A timer generates recurring events. Code inside the
timer event will recur until the timer is stopped.
19. Animation and Timers
Timers allow programmers to execute code at
specific intervals. Timers may be found in the
toolbox:
Please note that, once brought over to the form, timers do not actually appear on the form. They can be seen below
the form, in your Component Tray.
20. Animation and Timers
Timers only have a few properties.
The property, Interval, allows the programmer to
specify how many milliseconds lapse when executing
the block of code.
