[C#] Graphics平移縮放旋轉

[C#] Graphics平移縮放旋轉

【平移】

private void btnTranslate_Click(object sender, EventArgs e)
        {
            Graphics graphics = this.CreateGraphics();
            // 紅色筆
            Pen pen = new Pen(Color.Red, 5);
            Rectangle rect = new Rectangle(0, 0, 200, 50);
            // 用紅色筆畫矩形
            graphics.DrawRectangle(pen, rect);
            // 向左平移100向下平移50
            graphics.TranslateTransform(100,50);
            // 藍色筆
            pen.Color = Color.Blue;
            // 用藍色筆重新畫平移之後的矩形
            graphics.DrawRectangle(pen, rect);
            graphics.Dispose();
            pen.Dispose();
        }

【縮放】

private void btnScale_Click(object sender, EventArgs e)
        {
            Graphics graphics = this.CreateGraphics();
            // 紅色筆
            Pen pen = new Pen(Color.Red, 5);
            Rectangle rect = new Rectangle(0, 0, 200, 50);
            // 用紅色筆畫矩形
            graphics.DrawRectangle(pen, rect);
            graphics.ScaleTransform(0.5f, 2);
            // 藍色筆
            pen.Color = Color.Blue;
            // 用藍色筆重新畫平移之後的矩形
            graphics.DrawRectangle(pen, rect);
            graphics.Dispose();
            pen.Dispose();
        }

寬縮小一半，高放大一倍

【旋轉】

private void btnTraslate_Click(object sender, EventArgs e)
        {
            Graphics graphics = this.CreateGraphics();
            // 紅色筆
            Pen pen = new Pen(Color.Red, 5);
            Rectangle rect = new Rectangle(0, 0, 200, 50);
            // 用紅色筆畫矩形
            graphics.DrawRectangle(pen, rect);
            graphics.TranslateTransform(200,0);
            graphics.RotateTransform(90);
            // 藍色筆
            pen.Color = Color.Blue;
            // 用藍色筆重新畫平移之後的矩形
            graphics.DrawRectangle(pen, rect);
            graphics.Dispose();
            pen.Dispose();
        }

坐標原點為矩形的左上點。