OK, I fix everything, now is exactly what I want.
I have a textBox1, panel1, and drawTexta (a button).
When I click the button and choose a point in the panel, I want to draw the string from the textBox1.
private void panel1_Paint(object sender, PaintEventArgs e)
{
using (SolidBrush br = new SolidBrush(Color.Red))
{
StringFormat sf = new StringFormat();
sf.FormatFlags = StringFormatFlags.DirectionRightToLeft;
e.Graphics.DrawString(textBox1.Text, this.Font, br, point1, sf);
}
}
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
point1 = new Point(e.X, e.Y);
}
bool flag = false;
Point point1 = new Point();
private void drawTexta_Click(object sender, EventArgs e)
{
flag = true;
panel1.Refresh();
}
The text isn't being drawn to panel1 because you need to refresh it.
Add this code to button1_Click, after you set drawText to true:
panel1.Refresh();
That will make the static text show up.
Related
I want to draw(Fill) a rectangle in to my form when I click on the button. But I can't manage to make it work and dont know what is wrong.
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics; //verklaart naar object Graphics
Vierkant vierkant = new Vierkant();
}
private void vierkant_Click(object sender, EventArgs e)
{
SolidBrush myBrush = new SolidBrush(Color.Cyan);
g.FillRectangle(myBrush, 20, 20, 50, 50);
}
Shall the drawing persist or not? Meaning: Shall it still be there after eg a Resize or maximize etc? Also: What is a Vierkant?
To make it persist you can use code like this:
private void Form1_Paint(object sender, PaintEventArgs e)
{
if (paintIt)
using( SolidBrush myBrush = new SolidBrush(Color.Cyan) )
e.Graphics.FillRectangle(myBrush, 20, 20, 50, 50);
}
bool paintIt = false;
private void vierkant_Click(object sender, EventArgs e)
{
paintIt = true;
this.Invalidate();
// ?? what is this supposed to do or be??
// Vierkant vierkant = new Vierkant();
}
This will work if both events are hooked up. For more interesting drawings you will need to store more than a bool flag but Lists of a drawAction class you need to invent which will include the shapes, its data, brushes etc..
If you replace paintIt = true; by paintIt = !paintIt; the Rectangle will appear and disappear on each click..
I have a picture box and I draw a string on it by DrawString(). I change position of the string by scrolling a TrackBar. But I want to move the string by directly clicking on the string and then dragging. It'll be easier for any user. Can anybody help me achieve this?
Edit: I already move my pictureBox1 my mouse click:
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawImage(img, 0, 0);
e.Graphics.DrawString(str, font, new SolidBrush(color), new PointF(NinjaClass.NINJA.pointX, NinjaClass.NINJA.pointY));
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
x = e.X;
y = e.Y;
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
pictureBox1.Left += (e.X - x);
pictureBox1.Top += (e.Y - y);
}
}
Using DrawString is not very convenient for such a task, you have to save a Rectangle around the string, update that rectangle according to the mouse movement ... If we need to click exactly on the string curve to move the string, using DrawString can't help. In such a case we have to use a GraphicsPath which supports a little hittesting. However in this case we just allow user to click on the string bounds, because clicking on the string curve with small font or even normal font is not easy and very annoying indeed. Try the following code:
//your form constructor
public Form1(){
InitializeComponent();
//add string to the GraphicsPath, the string location is initialized with (10,10)
gp.AddString("Your string goes here", Font.FontFamily,
(int)Font.Style, 20, new Point(10, 10), StringFormat.GenericDefault);
}
GraphicsPath gp = new GraphicsPath();
float dx, dy;
//the Paint event handler for your pictureBox1
private void pictureBox1_Paint(object sender, PaintEventArgs e) {
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
gp.Transform(new Matrix(1, 0, 0, 1, dx, dy));//Translate and paint
e.Graphics.FillPath(Brushes.Red, gp);
gp.Transform(new Matrix(1,0,0,1,-dx,-dy));//translate back (reset to old location)
}
Point downPoint;
bool hitOn;
//MouseDown event handler for your pictureBox1
private void pictureBox1_MouseDown(object sender, MouseEventArgs e){
if(e.Button == MouseButtons.Left){
downPoint = e.Location;
if (gp.GetBounds(new Matrix(1,0,0,1,dx,dy)).Contains(e.Location)) {
gp.Transform(new Matrix(1, 0, 0, 1, dx, dy));
hitOn = true;
}
}
}
//MouseMove event handler for your pictureBox1
private void pictureBox1_MouseMove(object sender, MouseEventArgs e) {
if (e.Button == MouseButtons.Left) {
if(hitOn){
dx = e.X - downPoint.X;
dy = e.Y - downPoint.Y;
pictureBox1.Invalidate();
} else {
pictureBox1.Left += e.X - downPoint.X;
pictureBox1.Top += e.Y - downPoint.Y;
}
}
}
//MouseUp event handler for your pictureBox1
private void pictureBox1_MouseUp(object sender, MouseEventArgs e) {
hitOn = false;
}
Update: For using a transparent backColor Label: There is a note that when you drag and drop a label on a pictureBox at design time, the Parent of the label will be the pictureBox container not the PictureBox, that's by design, because PictureBox is not intended to contain any control. So you have to set the Parent using code, for the code moving the label, you do similarly to what you do with your PictureBox, the difference is the parent of PictureBox is your form while the parent of the label is your pictureBox:
public Form1(){
InitializeComponent();
label1.BackColor = Color.Transparent;
label1.Parent = pictureBox1;
//try this to prevent a little flicker, but looks like it does not help much
typeof(Control).GetProperty("DoubleBuffered", System.Reflection.BindingFlags.NonPublic |
System.Reflection.BindingFlags.Instance)
.SetValue(pictureBox1, true, null);
}
Point lblDownPoint;
//MouseDown event handler for your label1
private void label1_MouseDown(object sender, MouseEventArgs e){
if(e.Button == MouseButtons.Left) lblDownPoint = e.Location;
}
//MouseMove event handler for your label1
private void label1_MouseMove(object sender, MouseEventArgs e){
if(e.Button == MouseButtons.Left) {
label1.Left += e.X - lblDownPoint.X;
label2.Top += e.Y - lblDownPoint.Y;
}
}
However after trying using a transparent BackColor label instead, I can see that it's fairly worse (caused by flicker) than draw directly on the pictureBox as the previous code does. You should consider to choose between them yourself, the previous code seems a little complicated (but not really if you understand it).
I have a custom PictureBox which can zoom in using MouseWheel event. Now I want to add a panning feature to it. I mean when PictureBox is in zoomed state, if user left clicks and holds the click then move the mouse, the image would pan within the picturebox.
Here is my code but unfortunately it does not work! I don't know where to look anymore...
private Point _panStartingPoint = Point.Empty;
private bool _panIsActive;
private void CurveBox_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Focus();
_panIsActive = true;
_panStartingPoint = e.Location;
}
}
private void CurveBox_MouseUp(object sender, MouseEventArgs e)
{
_panIsActive = false;
}
private void CurveBox_MouseLeave(object sender, EventArgs e)
{
_panIsActive = false;
}
private void CurveBox_MouseMove(object sender, MouseEventArgs e)
{
if(_panIsActive && IsZoomed)
{
var g = CreateGraphics(); //Create graphics from PictureBox
var nx = _panStartingPoint.X + e.X;
var ny = _panStartingPoint.Y + e.Y;
var sourceRectangle = new Rectangle(nx, ny, Image.Width, Image.Height);
g.DrawImage(Image, nx, ny, sourceRectangle, GraphicsUnit.Pixel);
}
}
I am suspecting the MouseMove event...I am not sure if anything happens in this event and/or nx and ny does contain correct point.
Any helps/tips is really appriciated!
I think the math is backwards. Try it like this:
private Point startingPoint = Point.Empty;
private Point movingPoint = Point.Empty;
private bool panning = false;
void pictureBox1_MouseDown(object sender, MouseEventArgs e) {
panning = true;
startingPoint = new Point(e.Location.X - movingPoint.X,
e.Location.Y - movingPoint.Y);
}
void pictureBox1_MouseUp(object sender, MouseEventArgs e) {
panning = false;
}
void pictureBox1_MouseMove(object sender, MouseEventArgs e) {
if (panning) {
movingPoint = new Point(e.Location.X - startingPoint.X,
e.Location.Y - startingPoint.Y);
pictureBox1.Invalidate();
}
}
void pictureBox1_Paint(object sender, PaintEventArgs e) {
e.Graphics.Clear(Color.White);
e.Graphics.DrawImage(Image, movingPoint);
}
You aren't disposing your graphic object, and CreateGraphics is just a temporary drawing anyway (minimizing would erase it) so I moved the drawing code to the Paint event and am just invalidating as the user is panning.
Bitmap hh = (Bitmap)System.Drawing.Bitmap.FromFile("example.png");
Graphics.FromImage(hh);
IntPtr ptr = hh.GetHicon();
Cursor c = new Cursor(ptr);
this.Cursor = c;
I use this code to create a custom image cursor. I want to retrieve the coordinates of this custom image cursor when on a Click event. So that these coordinates can be used to draw the image of this cursor in a picture box when clicked on the image loaded in the picture box. I'm doing this in C#.
I tried another approach
public partial class Form1 : Form
{
private Bitmap _bmp = new Bitmap(250, 250);
public Form1()
{
InitializeComponent();
panel1.MouseDown += new MouseEventHandler(panel1_MouseDown);
panel1.Paint += new PaintEventHandler(panel1_Paint);
using (Graphics g = Graphics.FromImage(_bmp))
g.Clear(SystemColors.Window);
}
private void pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
Point mouseDownLocation = new Point(e.X, e.Y);
label1.Text = mouseDownLocation.X.ToString();
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawImage(_bmp, new Point(0, 0));
}
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
using (Graphics g = Graphics.FromImage(_bmp))
{
g.DrawString("Mouse Clicked Here!", panel1.Font, Brushes.Black, e.Location);
}
panel1.Invalidate();
}
private void button1_Click(object sender, EventArgs e)
{
panel1.Image.Save(#"C:\test.jpg", ImageFormat.Jpeg);
}
But when i try so save the image i get an Exception: Object reference not set to an instance of an object.
Please note that panel1 in the code above refers to a picture box
To get the coordinates of the mouse on a PictureBox you should not handle the OnClick event but the OnMouseDown, for example in this way:
private void pb_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
Point mouseDownLocation = new Point(e.X, e.Y);
}
now you have the mouseDownLocation which contains the coordinates you were looking for.
i know the way to get the coordinate of mouse you can code it like
Cursor.Position.X and Cursor.Position.Y to get the Coordinate under the mouse
My current code allows me to draw rectangles from a user defined spot but not in the way in whihc i desire. I need it to be like you would do it in paint, here is my current code:
namespace SimpleDraw2
{
///
/// Description of MainForm.
///
public partial class MainForm : Form
{
bool IsMouseDown = false;
Point MousePosition;
int DrawShape = 0;
Bitmap StoredImage;
public MainForm()
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();
//
// TODO: Add constructor code after the InitializeComponent() call.
//
pictureBox1.Image = new Bitmap (pictureBox1.Width,pictureBox1.Height);
StoredImage = new Bitmap(pictureBox1.Width,pictureBox1.Height);
}
void PictureBox1MouseDown(object sender, MouseEventArgs e)
{
IsMouseDown = true;
MousePosition = e.Location;
Graphics gStored = Graphics.FromImage(StoredImage);
gStored.Clear(Color.Transparent);
gStored.DrawImage(pictureBox1.Image, 0, 0);
}
void PictureBox1MouseUp(object sender, MouseEventArgs e)
{
IsMouseDown = false;
}
void PictureBox1MouseMove(object sender, MouseEventArgs e)
{
Graphics g = Graphics.FromImage(pictureBox1.Image);
if (DrawShape == 0)
{
Pen p = new Pen(Color.Red, 10);
if (IsMouseDown)
{
g.DrawLine(p,MousePosition,e.Location);
MousePosition = e.Location;
}
}
if (DrawShape == 1)
{
g.Clear(Color.Transparent);
g.DrawImage(StoredImage,0,0);
g.DrawRectangle(Pens.Green,MousePosition.X,MousePosition.Y,e.X,e.Y);
}
if (DrawShape == 2)
{
g.Clear(Color.Transparent);
g.DrawImage(StoredImage, 0, 0);
g.DrawEllipse(Pens.HotPink, MousePosition.X, MousePosition.Y, e.X, e.Y);
}
if (DrawShape == 3)
{
g.Clear(Color.Transparent);
g.DrawImage(StoredImage, 0, 0);
g.DrawArc(Pens.Indigo,pictureBox1.Bounds, e.Y, e.X);
}
//if (DrawShape == 4)
//{
// g.Clear(Color.Transparent);
// g.DrawImage(StoredImage, 0, 0);
// g.DrawPolygon(Pens.Indigo, Point[] e.X);
//}
this.Refresh();
}
private void button2_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
axWindowsMediaPlayer1.URL = ofd.FileName;
}
}
private void button1_Click(object sender, EventArgs e)
{
axWindowsMediaPlayer1.Ctlcontrols.pause();
Bitmap bmp = new Bitmap(axWindowsMediaPlayer1.Width, axWindowsMediaPlayer1.Height);
Graphics gfx = Graphics.FromImage(bmp);
gfx.CopyFromScreen(PointToScreen(axWindowsMediaPlayer1.Location), new Point(0, 0), axWindowsMediaPlayer1.Bounds.Size, CopyPixelOperation.SourceCopy);
pictureBox1.BackgroundImage = bmp;
//axWindowsMediaPlayer1.Visible = false;
//pictureBox1.Visible = true;
}
private void button3_Click(object sender, EventArgs e)
{
Graphics gg = Graphics.FromImage(pictureBox1.BackgroundImage);
gg.Clear(Color.Transparent);
Graphics gStored = Graphics.FromImage(StoredImage);
gStored.Clear(Color.Transparent);
Graphics g = Graphics.FromImage(pictureBox1.Image);
g.Clear(Color.Transparent);
}
private void button4_Click(object sender, EventArgs e)
{
DrawShape = 1;
}
private void button6_Click(object sender, EventArgs e)
{
DrawShape = 2;
}
private void button8_Click(object sender, EventArgs e)
{
DrawShape = 3;
}
private void button7_Click(object sender, EventArgs e)
{
DrawShape = 0;
}
}
}
If someone could help me edit my code to iron out the issue to make it easy drag and draw system it would me much appreciate.
Thanks in Advance
Chris
From msdn:
Draws a rectangle specified by a
coordinate pair, a width, and a
height.
So your code won't work:
g.DrawRectangle(Pens.Green,MousePosition.X,MousePosition.Y,e.X,e.Y);
Should be something like
g.DrawRectangle(Pens.Green, MousePosition.X, MousePosition.Y, Math.Abs(e.X - MousePosition.X), Math.Abs(e.Y - MousePosition.Y));
The biggest problem I see is that you're trying to draw in the mouse events. This means your drawing will be wiped away the instant you get a refresh event.
Only draw in Paint events, never in mouse events. If you want your app to draw as a result of mouse events, set a point, rectangle, or whatever in the mouse events (like you start to do with IsMouseDown), invalidate the area you want to change in your MouseMoved event, then draw your rectangle or whatever in your Paint event.