Dragable rectangles

[Casper Hansen]

Hello. I have a question.. I have this script:

int mouseDownX;
int mouseDownY;

    int width;
    int height;

    private void Form1\_MouseUp(object sender, MouseEventArgs mouseEv)
    {
        width = mouseEv.X - mouseDownX;
        height = mouseEv.Y - mouseDownY;

        textBox2.Text = Convert.ToString(mouseEv.Location);

        Graphics graphics = this.CreateGraphics();

        Rectangle rectangle = new Rectangle(
                mouseDownX, mouseDownY, width, height);

        graphics.DrawRectangle(Pens.Red, rectangle);
    }

    private void Form1\_MouseDown(object sender, MouseEventArgs mouseEv)
    {
        textBox1.Text = Convert.ToString(mouseEv.Location);

        mouseDownX = mouseEv.X;
        mouseDownY = mouseEv.Y;
    }

Which works fine if I make a rectangle from the left top corner to the right bottom corner But is there any easier way of just making rectangles? Here is a video of what I want: http://www.youtube.com/watch?v=V5YO4U1UnO0 And here is a download link to my project: http://peecee.dk/upload/download/123329 So I want to be able to draw rectangles from any angle if you understand?

[C1AllenS]

Hello, There is no other way apart from this to draw rectangles. However, the only problem was the calculation part which was working only when you draw from lefttop to right bottom. However, while doing vice versa, the height and width was getting negative values. Try this piece of code in MouseUp event()

    private void Form1\_MouseUp(object sender, MouseEventArgs mouseEv)
    {

        textBox2.Text = Convert.ToString(mouseEv.Location);

        Graphics graphics = this.CreateGraphics();
        Rectangle rectangle;            

        if (mouseEv.Y > mouseDownY)
        {
            height = mouseEv.Y - mouseDownY;
        }
        else
            height =  mouseDownY - mouseEv.Y;
        
        if (mouseEv.X < mouseDownX)
        {
            width = mouseDownX - mouseEv.X;
            
            rectangle = new Rectangle(mouseEv.X, mouseEv.Y, width, height);
        }
        else
        {
            width = mouseEv.X - mouseDownX;
            rectangle = new Rectangle(mouseDownX, mouseDownY, width, height);
        }

        graphics.DrawRectangle(Pens.Red, rectangle);
                    
    }

I believe this should resolve your issue. Regards, Allen

Allen Smith ComponentOne LLC www.componentone.com

[Luc Pattyn]

Almost there. You must draw a positive distance starting from the smallest value, both for X and width, and for Y and height. It may be different though in both dimensions, your code assumes it is the same for both. You really should introduce new variables for Xmin and Ymin. I typically like to add a method DrawRectangle that hides these limitations, so it accepts all value combinations for X1,Y1 and X2,Y2 :)

Luc Pattyn [Forum Guidelines] [My Articles]

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[Casper Hansen]

Hey I have this project now: http://peecee.dk/upload/download/123403 It allmost works, the preview thing just doesnt work properly Could you guys take a look at it? Because I cant seem to find a soloution