質問編集履歴
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コードの追加
test
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File without changes
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test
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@@ -1,4 +1,4 @@
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androidアプリ開発にてエラーが
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androidアプリ開発にてdrawBitmapMeshで画像の変形をしようと思ったのですがエラーがでました。
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2
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どこを直せばよいのでしょうか？
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@@ -57,3 +57,159 @@
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at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
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```
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コードになります。
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```java
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import android.content.Context;
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74
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75
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import android.graphics.Bitmap;
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76
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import android.graphics.BitmapFactory;
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import android.graphics.Canvas;
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80
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import android.graphics.Color;
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import android.graphics.Paint;
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84
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85
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import android.util.AttributeSet;
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86
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import android.view.MotionEvent;
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88
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89
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import android.view.View;
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91
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92
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93
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94
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95
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public class MainActivity extends View implements View.OnTouchListener{
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96
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97
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98
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99
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private final int MESH_WIDTH = 20;
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private final int MESH_HEIGHT = 20;
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private final int MESH_SIZE = (MESH_WIDTH+1)*(MESH_HEIGHT+1)*2;
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105
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106
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private Bitmap mBmp;
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private float[] mVents;
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private Paint mPaint;
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public MainActivity(Context context, AttributeSet attrs) {
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super(context, attrs);
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mBmp = BitmapFactory.decodeResource(getResources(), R.drawable.red);
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setInitialMesh();
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setOnTouchListener(this);
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mPaint = new Paint();
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mPaint.setStrokeWidth(2);
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mPaint.setColor(Color.WHITE);
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}
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public void setInitialMesh() {
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mVents = new float[MESH_SIZE];
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for (int i=0;i<=MESH_HEIGHT;i++) {
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for (int j=0;j<=MESH_WIDTH;j++) {
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int pos = i * (MESH_WIDTH + 1) + j;
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mVents[2 * pos] = j * mBmp.getWidth()/MESH_WIDTH;
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mVents[2 * pos + 1] = i * mBmp.getHeight()/MESH_HEIGHT;
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}
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}
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158
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159
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}
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160
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@Override
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public boolean onTouch(View v, MotionEvent event) {
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if (event.getAction()==MotionEvent.ACTION_MOVE) {
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stepNearerTouchPoint(event.getX(), event.getY());
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invalidate();
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}
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return true;
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}
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179
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180
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181
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private void stepNearerTouchPoint(float x, float y) {
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182
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183
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//メッシュの外周は固定したままにする
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184
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for (int i=1;i<MESH_HEIGHT;i++) {
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186
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187
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for (int j=1;j<MESH_WIDTH;j++) {
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188
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189
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int pos = i * (MESH_WIDTH + 1) + j;
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190
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float dist = (float)Math.sqrt((mVents[2 * pos] - x) * (mVents[2 * pos] - x) + (mVents[2 * pos + 1] - y) * (mVents[2 * pos + 1] - y));
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192
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mVents[2 * pos] += (x - mVents[2 * pos]) / dist;
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194
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195
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mVents[2 * pos + 1] += (y - mVents[2 * pos + 1]) / dist;
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196
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197
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}
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198
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199
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}
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200
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201
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}
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202
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203
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204
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205
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@Override
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206
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207
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protected void onDraw(Canvas canvas) {
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208
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209
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canvas.drawBitmapMesh(mBmp, MESH_WIDTH, MESH_HEIGHT-1, mVents, (MESH_WIDTH+1)*2, null, 0, null);
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210
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211
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}
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212
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213
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}
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214
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215
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```
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