Drawroundrect method: Draw a rounded rectangle

[Function description] This method is used to draw a rounded rectangle on the canvas by specifying the rectf object and the radius of the rounded corner. This method is the main method to draw a rounded rectangle. You can also set the hollow effect of the paint brush to draw a hollow rounded rectangle.

[Basic syntax] public void drawroundrect (rectf rect, float RX, float ry, paint)

Parameter description

Rect: rectf object.

RX: the radius of the rounded corner in the X direction.

Ry: the radius of the rounded corner in the Y direction.

Paint: the paint brush used for painting.

[Demo] the following code demonstrates how to draw a rounded rectangle on the canvas.

1. Protected void ondraw (canvas ){
2. // Todo auto-generated method stub
3. Super. ondraw (canvas );
4. Paint. setantialias (true); // you can specify the paint brush to be non-sawtooth.
5. Paint. setcolor (color. Black); // you can specify the paint color.
6. Canvas. drawcolor (color. White); // white background
7. Paint. setstrokewidth (float) 3.0); // line width
8. Paint. setstyle (style. Stroke); // hollow Effect
9. Rect R1 = new rect (); // rect object
10. R1.left = 50; // left
11. R1.top = 50; // above
12. R1.right = 450; // right
13. R1.bottom = 250; // bottom
14. Canvas. drawrect (R1, paint); // draw a rectangle
15. Rectf r2 = new rectf (); // rectf object
16. R2.left = 50; // left
17. R2.top = 400; // above
18. R2.right = 450; // right
19. R2.bottom = 600; // bottom
20. Canvas. drawroundrect (R2, 10, 10, paint); // draw a rounded rectangle.
21. }

In this Code, first set the color of the paint brush and set the canvas to a white background. Then, set the width of the paint brush and the hollow effect to draw the hollow moment. Finally, call the drawrect method to draw a rectangle on the canvas, and call the drawroundrect method to draw a rounded rectangle on the canvas. When you run this code, you can see the display effect shown in 8.18 on the mobile phone screen.

Figure 8.17 draw a rectangle

Figure 8.18 draw a rounded rectangle

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Drawroundrect method: Draw a rounded rectangle