Android Color Rendering (v) lineargradient linear rendering

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Android color Processing (v) lineargradient linear rendering

Believe that many people have seen the lyrics synchronization effect, one is the vertical direction of the scroll, on the other hand is the level of the lyrics color gradient lighting effect, how to do this effect? This requires the use of lineargradient linear rendering, the following is the first to see the specific use:

LinearGradient has two constructors;

Public lineargradient(float x0, float y0, float x1, float y1, int[] colors, float[) Positions,shader.tilemode tile )

Parameters:

Float x0: Gradient start point x coordinate

Float y0: Gradient start point y coordinate

Float x1: Gradient end point x coordinate

Float y1: Gradient end point Y coordinate

int[] Colors: int array of colors

Float[] Positions: An array of colors relative to the position, nullable, NULL, nullable, and the color evenly spaced along the gradient line

Shader.tilemode tile: Renderer tiling mode

public lineargradient(float x0, float y0, float x1, float y1, int color0, int color1,shader.tilemode tile)

float x0: Gradient start point x coordinate

float y0: gradient start point y coordinate

float x1: gradient end point x coordinate

float y1: Gradient end point Y coordinate

int color0: Starting gradient

int Color1: End Gradient Color

Shader.tilemode tile: Renderer tiling mode

:

Then look at how to achieve this effect;

Mainactivity:

[Java]View PlainCopy

2. Package com.tony.shader;
6. Import Android.os.Bundle;
8. Import android.app.Activity;
12. Public class Mainactivity extends Activity {
16. private Lineargradientview Lineargradientview;
20. @Override
22. protected void OnCreate (Bundle savedinstancestate) {
24. super.oncreate (savedinstancestate);
28. Lineargradientview = New Lineargradientview (this);
30. Setcontentview (Lineargradientview);
32. }
36. }

Lineargradientview;

[Java]View PlainCopy

2. Package com.tony.shader;
6. Import Android.content.Context;
8. Import Android.graphics.Canvas;
10. Import Android.graphics.Color;
12. Import android.graphics.LinearGradient;
14. Import Android.graphics.Paint;
16. Import Android.util.AttributeSet;
18. Import Android.graphics.Shader;
20. Import Android.view.View;
24. Public class Lineargradientview extends View {
28. private LinearGradient lineargradient = null;
30. Private Paint paint = null;
34. Public Lineargradientview (context context)
36. {
38. super (context);
40. LinearGradient = New LinearGradient (0, 0, + , + , new int[] {
42. Color.yellow, Color.green, Color.transparent, color.white}, null,
44. Shader.TileMode.REPEAT);
46. Paint = new paint ();
48. }
52. Public Lineargradientview (context context, AttributeSet attrs) {
54. Super (context, attrs);
56. }
60. @Override
62. protected void OnDraw (canvas canvas) {
64. //TODO auto-generated method stub
66. Super.ondraw (canvas);
68. //Set renderer
70. Paint.setshader (lineargradient);
72. //Draw a circle
74. Canvas.drawcircle (A, N, a, a, paint);
76. }
80. }

Android Color Rendering (v) lineargradient linear rendering