Android畫圖Path類的使用

Android畫圖Path類的使用：

1. package com.javaeye.android.my;
3. import android.app.Activity;
4. import android.os.Bundle;
5. import android.view.View;
6. import android.content.Context;
7. import android.graphics.Canvas;
8. import android.graphics.Color;
9. import android.graphics.Paint;
10. import android.graphics.RectF;
11. import android.graphics.Path;
12. import android.graphics.Shader;
13. import android.graphics.LinearGradient;
15. //主程序中繼承自Android.view.View的 MyView類，重寫 MyView的onDraw（）方法，
16. //一開始就會運行繪制的工作，在onDraw（）中以Paint將幾何圖形繪制在Canvas上，
17. //以 paint.setColor() 改變圖形顏色、以 paint.setStyle()的設置來控制畫出的的
18. //圖形是空心還是實心。程序的最後一段，就是直接在Canvas寫上文字，隨著Paint對
19. //象裡的屬性設置，也會有不同的外觀模式。
21. public class GraphicesActivity extends Activity {
22. /** Called when the activity is first created. */
23. @Override
24. public void onCreate(Bundle savedInstanceState) {
25. super.onCreate(savedInstanceState);
26. /*設置ContentView為自定義的MyVieW*/
27. MyView myView=new MyView(this);
28. setContentView(myView);
29. }
31. /* 自定義繼承View 的MyView*/
32. private class MyView extends View {
33. public MyView(Context context){
34. super(context) ;
35. }
37. /*重寫onDraw（）*/
38. @Override
39. protected void onDraw(Canvas canvas)
40. {
41. super.onDraw(canvas);
42. /*設置背景為白色*/
43. canvas.drawColor(Color.WHITE);
45. Paint paint=new Paint();
46. /*去鋸齒*/
47. paint.setAntiAlias(true);
48. /*設置paint的顏色*/
49. paint.setColor(Color.RED);
50. /*設置paint的 style 為STROKE：空心*/
51. paint.setStyle(Paint.Style.STROKE);
52. /*設置paint的外框寬度*/
53. paint.setStrokeWidth(3);
55. /*畫一個空心圓形*/
56. canvas.drawCircle(40, 40, 30, paint);
57. /*畫一個空心正方形*/
58. canvas.drawRect(10, 90, 70, 150, paint);
59. /*畫一個空心長方形*/
60. canvas.drawRect(10, 170, 70,200, paint);
61. /*畫一個空心橢圓形*/
62. canvas.drawOval(new RectF(10,220,70,250), paint);
63. /*畫一個空心三角形*/
64. Path path=new Path();
65. path.moveTo(10, 330);
66. path.lineTo(70,330);
67. path.lineTo(40,270);
68. path.close();
69. canvas.drawPath(path, paint);
70. /*畫一個空心梯形*/
71. Path path1=new Path();
72. path1.moveTo(10, 410);
73. path1.lineTo(70,410);
74. path1.lineTo(55,350);
75. path1.lineTo(25, 350);
76. path1.close();
77. canvas.drawPath(path1, paint);
79. /*設置paint的顏色*/
80. paint.setColor(Color.BLUE);
81. /*設置paint 的style為 FILL：實心*/
82. paint.setStyle(Paint.Style.FILL);
83. /*畫一個實心圓*/
84. canvas.drawCircle(120,40,30, paint);
85. /*畫一個實心正方形*/
86. canvas.drawRect(90, 90, 150, 150, paint);
87. /*畫一個實心長方形*/
88. canvas.drawRect(90, 170, 150,200, paint);
89. /*畫一個實心橢圓*/
90. RectF re2=new RectF(90,220,150,250);
91. canvas.drawOval(re2, paint);
92. /*畫一個實心三角形*/
93. Path path2=new Path();
94. path2.moveTo(90, 330);
95. path2.lineTo(150,330);
96. path2.lineTo(120,270);
97. path2.close();
98. canvas.drawPath(path2, paint);
99. /*畫一個實心梯形*/
100. Path path3=new Path();
101. path3.moveTo(90, 410);
102. path3.lineTo(150,410);
103. path3.lineTo(135,350);
104. path3.lineTo(105, 350);
105. path3.close();
106. canvas.drawPath(path3, paint);
108. /*設置漸變色*/
109. Shader mShader=new LinearGradient(0,0,100,100,
110. new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW},
111. null,Shader.TileMode.REPEAT);
112. //Shader.TileMode三種模式
113. //REPEAT:沿著漸變方向循環重復
114. //CLAMP:如果在預先定義的范圍外畫的話，就重復邊界的顏色
115. //MIRROR:與REPEAT一樣都是循環重復，但這個會對稱重復
116. paint.setShader(mShader);//用Shader中定義定義的顏色來話
118. /*畫一個漸變色圓*/
119. canvas.drawCircle(200,40,30, paint);
120. /*畫一個漸變色正方形*/
121. canvas.drawRect(170, 90, 230, 150, paint);
122. /*畫一個漸變色長方形*/
123. canvas.drawRect(170, 170, 230,200, paint);
124. /*畫一個漸變色橢圓*/
125. RectF re3=new RectF(170,220,230,250);
126. canvas.drawOval(re3, paint);
127. /*畫一個漸變色三角形*/
128. Path path4=new Path();
129. path4.moveTo(170,330);
130. path4.lineTo(230,330);
131. path4.lineTo(200,270);
132. path4.close();
133. canvas.drawPath(path4, paint);
134. /*畫一個漸變色梯形*/
135. Path path5=new Path();
136. path5.moveTo(170, 410);
137. path5.lineTo(230,410);
138. path5.lineTo(215,350);
139. path5.lineTo(185, 350);
140. path5.close();
141. canvas.drawPath(path5, paint);
143. /*寫字*/
144. paint.setTextSize(24);
145. canvas.drawText("圓形", 240, 50, paint);
146. canvas.drawText("正方形", 240, 120, paint);
147. canvas.drawText("長方形", 240, 190, paint);
148. canvas.drawText("橢圓形", 240, 250, paint);
149. canvas.drawText("三角形", 240, 320, paint);
150. canvas.drawText("梯形", 240, 390, paint);
151. }
152. }
153. }