coco
54 lines
2.1 KiB
Java
54 lines
2.1 KiB
Java
package lecho.lib.hellocharts.renderer;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import lecho.lib.hellocharts.model.Viewport;
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import lecho.lib.hellocharts.provider.LineChartDataProvider;
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import lecho.lib.hellocharts.util.ChartUtils;
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import lecho.lib.hellocharts.view.Chart;
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/**
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* Renderer for preview chart based on LineChart. In addition to drawing chart data it also draw current viewport as
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* preview area.
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*/
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public class PreviewLineChartRenderer extends LineChartRenderer {
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private static final int DEFAULT_PREVIEW_TRANSPARENCY = 64;
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private static final int FULL_ALPHA = 255;
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private static final int DEFAULT_PREVIEW_STROKE_WIDTH_DP = 2;
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private Paint previewPaint = new Paint();
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public PreviewLineChartRenderer(Context context, Chart chart, LineChartDataProvider dataProvider) {
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super(context, chart, dataProvider);
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previewPaint.setAntiAlias(true);
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previewPaint.setColor(Color.LTGRAY);
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previewPaint.setStrokeWidth(ChartUtils.dp2px(density, DEFAULT_PREVIEW_STROKE_WIDTH_DP));
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}
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@Override
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public void drawUnclipped(Canvas canvas) {
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super.drawUnclipped(canvas);
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final Viewport currentViewport = computator.getCurrentViewport();
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final float left = computator.computeRawX(currentViewport.left);
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final float top = computator.computeRawY(currentViewport.top);
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final float right = computator.computeRawX(currentViewport.right);
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final float bottom = computator.computeRawY(currentViewport.bottom);
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previewPaint.setAlpha(DEFAULT_PREVIEW_TRANSPARENCY);
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previewPaint.setStyle(Paint.Style.FILL);
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canvas.drawRect(left, top, right, bottom, previewPaint);
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previewPaint.setStyle(Paint.Style.STROKE);
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previewPaint.setAlpha(FULL_ALPHA);
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canvas.drawRect(left, top, right, bottom, previewPaint);
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}
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public int getPreviewColor() {
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return previewPaint.getColor();
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}
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public void setPreviewColor(int color) {
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previewPaint.setColor(color);
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}
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} |